Living Creatures: Exploring their Characteristics – CBSE NCERT Study Resources

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Living Creatures: Exploring their Characteristics

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6th

6th - Science (EVS) Curiosity

Living Creatures: Exploring their Characteristics

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Chapter Overview: Living Creatures - Exploring their Characteristics

This chapter introduces students to the fascinating world of living creatures and their unique characteristics. It covers the basic features that distinguish living organisms from non-living things, classification of living beings, and their habitats.

Living Organism: Any entity that exhibits life processes such as growth, reproduction, respiration, and response to stimuli.

Characteristics of Living Creatures

  • Growth: Living organisms grow in size and complexity over time.
  • Reproduction: They produce offspring to continue their species.
  • Respiration: They take in oxygen and release carbon dioxide for energy.
  • Response to Stimuli: They react to changes in their environment.
  • Nutrition: They require food for energy and growth.

Classification of Living Organisms

Living creatures are broadly classified into five kingdoms:

  1. Monera: Unicellular organisms like bacteria.
  2. Protista: Mostly unicellular, e.g., amoeba.
  3. Fungi: Multicellular decomposers like mushrooms.
  4. Plantae: Multicellular plants that perform photosynthesis.
  5. Animalia: Multicellular animals with diverse habitats.

Habitats of Living Creatures

Different organisms adapt to specific environments:

  • Terrestrial: Land-based habitats (e.g., forests, deserts).
  • Aquatic: Water-based habitats (e.g., oceans, rivers).
  • Aerial: Organisms that can fly (e.g., birds, insects).

Habitat: The natural environment where an organism lives, finds food, and reproduces.

Adaptations in Living Creatures

Organisms develop special features to survive in their habitats:

  • Camouflage: Blending with surroundings to avoid predators.
  • Hibernation: Sleeping through harsh winters to conserve energy.
  • Migration: Seasonal movement to favorable environments.

Conclusion

This chapter helps students understand the diversity of life forms and their unique adaptations. By studying these characteristics, they learn how living creatures interact with their environment.

All Question Types with Solutions – CBSE Exam Pattern

Explore a complete set of CBSE-style questions with detailed solutions, categorized by marks and question types. Ideal for exam preparation, revision and practice.

Very Short Answer (1 Mark) – with Solutions (CBSE Pattern)

These are 1-mark questions requiring direct, concise answers. Ideal for quick recall and concept clarity.

Question 1:
What is the process by which plants make their own food?
Answer:
Photosynthesis
Plants use sunlight to make food.
Question 2:
Name the hard outer covering of insects.
Answer:
Exoskeleton
Protects their body.
Question 3:
Which gas do animals breathe out?
Answer:
Carbon dioxide
Exhaled during respiration.
Question 4:
What is the young one of a frog called?
Answer:
Tadpole
Lives in water.
Question 5:
Name the largest mammal on Earth.
Answer:
Blue whale
Lives in oceans.
Question 6:
What do herbivores eat?
Answer:
Plants
NCERT example: Cow.
Question 7:
Which bird has a hooked beak?
Answer:
Eagle
Used to tear meat.
Question 8:
Name the movement of animals from one place to another.
Answer:
Migration
Example: Siberian cranes.
Question 9:
What is the habitat of a camel?
Answer:
Desert
Adapted to dry areas.
Question 10:
Which animal has flippers for swimming?
Answer:
Seal
NCERT example: Aquatic mammal.
Question 11:
Name the process of shedding skin in snakes.
Answer:
Molting
Helps them grow.
Question 12:
What is the breathing organ of fish?
Answer:
Gills
Extracts oxygen from water.
Question 13:
Which animal has three pairs of legs?
Answer:
Insect
Example: Ant.
Question 14:
Name the kingdom that includes mushrooms.
Answer:
Fungi
Decomposes dead matter.
Question 15:
What is the basic unit of life in all living organisms?
Answer:

The basic unit of life in all living organisms is the cell. Cells are the smallest structures capable of performing life functions.

Question 16:
Name the process by which green plants make their own food.
Answer:

Green plants make their own food through the process of photosynthesis. Photosynthesis uses sunlight, carbon dioxide, and water to produce glucose and oxygen.

Question 17:
What are the two main types of living organisms based on cell structure?
Answer:

The two main types of living organisms based on cell structure are:
Prokaryotes (cells without a nucleus, e.g., bacteria)
Eukaryotes (cells with a nucleus, e.g., plants and animals).

Question 18:
Define habitat with an example.
Answer:

A habitat is the natural environment where an organism lives. For example, a lion lives in a grassland habitat.

Question 19:
Name the gas released by plants during photosynthesis.
Answer:

Plants release oxygen during photosynthesis. This gas is essential for the survival of most living organisms.

Question 20:
What are unicellular organisms? Give one example.
Answer:

Unicellular organisms are made up of only one cell. An example is Amoeba, which performs all life functions in a single cell.

Question 21:
Why do animals move from one place to another?
Answer:

Animals move to find food, escape predators, and seek better habitats. Movement helps them survive and reproduce.

Question 22:
What is the function of roots in a plant?
Answer:

Roots anchor the plant to the soil and absorb water and minerals needed for growth.

Question 23:
Name the process by which living organisms produce more of their own kind.
Answer:

The process is called reproduction. It ensures the continuation of species.

Question 24:
What is the difference between autotrophs and heterotrophs?
Answer:

Autotrophs make their own food (e.g., plants), while heterotrophs depend on others for food (e.g., animals).

Question 25:
Why is the respiratory system important in animals?
Answer:

The respiratory system helps animals take in oxygen and remove carbon dioxide, which is essential for energy production.

Very Short Answer (2 Marks) – with Solutions (CBSE Pattern)

These 2-mark questions test key concepts in a brief format. Answers are expected to be accurate and slightly descriptive.

Question 1:
What are the two main types of living creatures based on their cell structure?
Answer:

The two main types are unicellular (single-celled, e.g., Amoeba) and multicellular (many-celled, e.g., humans).

Question 2:
What is the primary difference between autotrophs and heterotrophs?
Answer:

Autotrophs make their own food (e.g., plants), while heterotrophs depend on others for food (e.g., animals).

Question 3:
List two features that help birds fly.
Answer:
  • Lightweight hollow bones
  • Streamlined body and feathers for lift
Question 4:
Why do fish have gills?
Answer:

Gills help fish extract oxygen from water, enabling them to breathe underwater.

Question 5:
What is the function of camouflage in animals?
Answer:

Camouflage helps animals blend with their surroundings to avoid predators or sneak up on prey.

Question 6:
Name two adaptations of desert plants.
Answer:
  • Thick stems to store water
  • Reduced leaves to minimize water loss
Question 7:
How do earthworms breathe?
Answer:

Earthworms breathe through their moist skin, absorbing oxygen directly from the soil.

Question 8:
What is the role of scales in reptiles?
Answer:

Scales protect reptiles from injury and reduce water loss from their bodies.

Question 9:
Why do frogs have webbed feet?
Answer:

Webbed feet help frogs swim efficiently in water by pushing against it.

Question 10:
Give an example of a parasitic plant and its host.
Answer:

Cuscuta (dodder) is a parasitic plant that grows on host plants like sunflower for nutrients.

Short Answer (3 Marks) – with Solutions (CBSE Pattern)

These 3-mark questions require brief explanations and help assess understanding and application of concepts.

Question 1:
What are the characteristics that distinguish living organisms from non-living things?
Answer:

Living organisms show certain key characteristics that non-living things do not. These include:

  • Growth: Living things grow in size and number of cells.
  • Reproduction: They produce offspring of their own kind.
  • Respiration: They take in oxygen and release carbon dioxide.
  • Response to stimuli: They react to changes in their environment.
  • Nutrition: They need food for energy and growth.

Non-living things do not show these features.

Question 2:
Explain how plants and animals differ in their mode of nutrition.
Answer:

Plants are autotrophs, meaning they make their own food through photosynthesis using sunlight, water, and carbon dioxide.
Animals are heterotrophs, meaning they depend on plants or other animals for food. They cannot make their own food.

Question 3:
Describe the importance of respiration in living organisms.
Answer:

Respiration is vital because:

  • It releases energy from food for growth, movement, and other life processes.
  • It helps in the exchange of gases (oxygen and carbon dioxide).
  • Without respiration, cells would not get energy, and the organism would die.
Question 4:
What is the role of excretion in living beings? Give examples.
Answer:

Excretion removes harmful waste from the body. Examples:

  • Humans excrete urea through urine.
  • Plants release oxygen as a waste product during photosynthesis.
  • Animals like amoeba remove waste through their cell membrane.

Without excretion, toxins would build up and harm the organism.

Question 5:
How do unicellular and multicellular organisms differ in structure?
Answer:

Unicellular organisms, like amoeba, are made of a single cell that performs all life functions.
Multicellular organisms, like humans, are made of many cells that work together. Different cells have specialized functions, such as nerve cells for communication and muscle cells for movement.

Question 6:
Why is movement important for animals but not necessarily for plants?
Answer:

Animals move to find food, escape danger, and reproduce.
Plants do not move from place to place because they make their own food through photosynthesis and are rooted in the ground. However, some plants show movement in parts, like leaves turning toward sunlight (phototropism).

Question 7:
What are the characteristics of living organisms? Explain any three.
Answer:

Living organisms share several key characteristics. Three important ones are:

  • Growth: Living things grow by increasing in size and number of cells.
  • Reproduction: They produce offspring to continue their species.
  • Response to stimuli: They react to changes in their environment, like plants growing toward light.

Other characteristics include respiration, excretion, and movement.

Question 8:
How do plants differ from animals in terms of movement?
Answer:

Plants and animals show different types of movement:

  • Plants move slowly by growing toward light (phototropism) or roots growing toward water (hydrotropism).
  • Animals move quickly using muscles and limbs to walk, swim, or fly.

While plants are mostly fixed in one place, animals can move freely to find food or escape danger.

Question 9:
Why is respiration important for living organisms?
Answer:

Respiration is crucial because:

  • It releases energy from food for all life processes.
  • It helps remove waste gases like carbon dioxide.
  • Without respiration, cells wouldn't get energy to function.

Both plants and animals respire, though plants do it during both day and night while animals breathe continuously.

Question 10:
What is the difference between unicellular and multicellular organisms? Give one example of each.
Answer:

The main differences are:

  • Unicellular organisms have just one cell (e.g., Amoeba).
  • Multicellular organisms have many cells (e.g., humans).

Unicellular organisms perform all life activities in one cell, while multicellular organisms have specialized cells for different functions.

Question 11:
Explain how adaptation helps organisms survive in their environment with an example.
Answer:

Adaptation means special features that help organisms live in their surroundings:

  • Example: Camels have humps to store fat and survive in deserts.
  • Their long eyelashes protect eyes from sand.
  • Thick fur in polar bears keeps them warm in cold climates.

These adaptations develop over many generations to help species survive.

Question 12:
Describe the life processes that occur in both plants and animals.
Answer:

Common life processes include:

  • Nutrition: Plants make food (photosynthesis), animals eat food.
  • Respiration: Both use oxygen to release energy.
  • Excretion: Removing waste products from the body.

While the methods differ, these processes are essential for all living things to stay alive and healthy.

Long Answer (5 Marks) – with Solutions (CBSE Pattern)

These 5-mark questions are descriptive and require detailed, structured answers with proper explanation and examples.

Question 1:
Explain the characteristics of living organisms with examples from NCERT and daily life.
Answer:
Concept Overview

Living organisms share key traits like growth, reproduction, and response to stimuli. Our textbook shows how a mango tree grows and bears fruit.

Process Explanation
  • Growth: Plants grow taller, like the banyan tree in NCERT.
  • Reproduction: Birds lay eggs, seen in sparrows.
Real-world Application

We observe response to stimuli when touch-me-not leaves close on touching. [Diagram: Labeled parts of a plant responding to touch.]

Question 2:
How do aquatic animals adapt to their habitat? Use NCERT and local examples.
Answer:
Concept Overview

Aquatic animals have features like gills or streamlined bodies. Our textbook mentions fish using gills to breathe.

Process Explanation
  • Gills: Extract oxygen from water, as in rohu.
  • Fins: Help in swimming, like the shark.
Real-world Application

We see frogs in ponds with webbed feet for swimming. [Diagram: Fish with labeled gills and fins.]

Question 3:
Describe the life cycle of a butterfly with NCERT and garden observations.
Answer:
Concept Overview

Butterflies undergo metamorphosis, changing from egg to adult. NCERT shows the monarch butterfly cycle.

Process Explanation
  • Eggs: Laid on leaves, like in our school garden.
  • Pupa: Forms a cocoon, as seen in silkworms.
Real-world Application

We spot caterpillars on mint plants transforming. [Diagram: Stages of butterfly life cycle.]

Question 4:
Why are scavengers important in an ecosystem? Use NCERT and local examples.
Answer:
Concept Overview

Scavengers clean the environment by eating dead organisms. NCERT mentions vultures as scavengers.

Process Explanation
  • Decomposition: They break down waste, like hyenas.
  • Nutrient recycling: Helps plants grow.
Real-world Application

We see crows eating leftover food, preventing spoilage. [Diagram: Scavenger bird feeding on waste.]

Question 5:
Compare herbivores and carnivores using NCERT and zoo examples.
Answer:
Concept Overview

Herbivores eat plants, while carnivores eat other animals. NCERT shows cow and lion as examples.

Process Explanation
  • Teeth: Herbivores have flat teeth, like deer.
  • Claws: Carnivores use sharp claws, as in tigers.
Real-world Application

At the zoo, we notice giraffes eating leaves and leopards hunting. [Diagram: Comparison of herbivore and carnivore teeth.]

Question 6:
Explain the characteristics of living organisms with examples from NCERT.
Answer:
Concept Overview

Living organisms share common traits like growth, reproduction, and response to stimuli. Our textbook shows that plants and animals exhibit these features.

Process Explanation
  • Growth: Plants grow taller, humans grow in height.
  • Reproduction: Birds lay eggs, mango trees produce seeds.
  • Response: Mimosa folds leaves when touched.
Real-world Application

Farmers use these traits to identify healthy crops. For example, wilting plants lack water responsiveness.

Question 7:
How do aquatic animals adapt to their habitat? Use NCERT examples.
Answer:
Concept Overview

Aquatic animals have special features for survival in water. Our textbook mentions fish and dolphins as examples.

Process Explanation
  • Gills: Fish extract oxygen from water.
  • Streamlined bodies: Dolphins swim faster.
  • Fins: Help in balance and movement.
Real-world Application

Aquariums mimic these adaptations by providing oxygenated water for fish, similar to their natural habitat.

Question 8:
Describe the life cycle of a butterfly with a diagram reference.
Answer:
Concept Overview

Butterflies undergo metamorphosis, changing form through four stages. NCERT shows this with the example of a monarch butterfly.

Process Explanation
  • Egg: Laid on leaves.
  • Larva: Caterpillar eats leaves.
  • Pupa: Forms a chrysalis.
  • Adult: Emerges as butterfly.
Diagram
[Diagram: Lifecycle stages labeled from egg to adult]Real-world Application

Gardeners protect caterpillars to ensure butterfly populations thrive.

Question 9:
What are the differences between plants and animals? Give NCERT examples.
Answer:
Concept Overview

Plants and animals differ in movement, nutrition, and cell structure. Our textbook compares mango trees and humans.

Process Explanation
  • Movement: Animals walk; plants are fixed.
  • Nutrition: Plants photosynthesize; animals consume food.
  • Cells: Plant cells have cell walls.
Real-world Application

Zoos separate plant and animal exhibits based on these differences for proper care.

Question 10:
Explain how camouflage helps animals survive, using NCERT examples.
Answer:
Concept Overview

Camouflage lets animals blend into their surroundings to avoid predators. NCERT mentions the chameleon and stick insect.

Process Explanation
  • Color change: Chameleons match tree bark.
  • Body shape: Stick insects resemble twigs.
Real-world Application

Army uniforms use camouflage patterns inspired by nature for concealment.

Question 11:
Explain the characteristics of living organisms with suitable examples. How do these characteristics help distinguish living beings from non-living things?
Answer:

Living organisms exhibit several key characteristics that distinguish them from non-living things. These include:

  • Growth: Living beings grow in size and number. For example, a seedling grows into a tree, and animals grow from infancy to adulthood.
  • Reproduction: They produce offspring. Humans give birth to babies, while plants reproduce through seeds or spores.
  • Respiration: They take in oxygen and release carbon dioxide. For instance, humans breathe through lungs, and plants respire through stomata.
  • Response to stimuli: They react to their environment. A sunflower turns toward sunlight, and a dog barks at strangers.
  • Nutrition: They require food for energy. Animals consume plants or other animals, while plants make their food via photosynthesis.

These characteristics help us differentiate living organisms from non-living things like rocks or water, which do not grow, reproduce, or respond to stimuli.

Question 12:
Describe the habitat and adaptations of a camel. How do these adaptations help it survive in the desert?
Answer:

Camels are well-adapted to survive in harsh desert conditions due to their unique features:

  • Hump: Stores fat, which provides energy when food is scarce.
  • Long legs: Keep their body away from the hot sand.
  • Thick fur: Protects them from the scorching sun during the day and keeps them warm at night.
  • Eyelashes and nostrils: Prevent sand from entering their eyes and nose during sandstorms.
  • Water conservation: They can drink large amounts of water at once and lose very little through sweat or urine.

These adaptations allow camels to thrive in deserts where temperatures are extreme, and water is scarce. For example, their hump helps them go without food for days, and their padded feet prevent sinking into the sand.

Question 13:
Explain the characteristics of living organisms with suitable examples. How do these characteristics help distinguish living beings from non-living things?
Answer:

Living organisms exhibit certain key characteristics that distinguish them from non-living things. These include:

  • Growth: Living beings grow in size and complexity. For example, a seedling grows into a tree.
  • Reproduction: They produce offspring. Humans give birth to babies, while plants reproduce through seeds.
  • Respiration: They take in oxygen and release carbon dioxide. Animals breathe through lungs or gills.
  • Response to stimuli: They react to changes in their environment. A sunflower turns towards sunlight.
  • Nutrition: They require food for energy. Plants make their own food (photosynthesis), while animals consume other organisms.

Non-living things, like rocks or water, do not show these characteristics. For instance, a rock does not grow or reproduce. These features help scientists classify organisms and study life processes.

Question 14:
Describe the habitat and adaptations of a camel. How do these adaptations help it survive in desert conditions?
Answer:

Camels are well-adapted to survive in harsh desert habitats. Their key adaptations include:

  • Hump: Stores fat, which provides energy when food is scarce.
  • Long legs: Keep their body away from the hot sand.
  • Thick fur: Protects them from the sun's heat during the day and keeps them warm at night.
  • Eyelashes and nostrils: Prevent sand from entering their eyes and nose during sandstorms.
  • Water conservation: They can drink large amounts of water at once and lose very little through sweat or urine.

These adaptations allow camels to travel long distances without food or water, making them ideal for desert life. For example, their hump acts like a food reserve, helping them survive when resources are limited.

Question 15:
Explain the characteristics of living organisms with suitable examples. How do these characteristics help distinguish living things from non-living things?
Answer:

Living organisms exhibit several key characteristics that differentiate them from non-living things. These include:

  • Growth: Living organisms grow in size and complexity. For example, a seedling grows into a tree.
  • Reproduction: They produce offspring. Humans give birth to babies, and plants produce seeds.
  • Respiration: They respire to release energy. Animals breathe in oxygen, and plants exchange gases.
  • Response to stimuli: They react to their environment. A sunflower turns toward sunlight.
  • Excretion: They remove waste. Humans excrete urine, and plants release oxygen.

Non-living things, like rocks or water, do not show these traits. These characteristics help scientists classify organisms and study life processes.

Question 16:
Describe the habitat and adaptations of a camel. How do these adaptations help it survive in the desert?
Answer:

Camels live in desert habitats, where conditions are harsh with extreme heat and scarce water. Their adaptations include:

  • Humps: Store fat, which provides energy and water when food is scarce.
  • Long legs: Keep their body away from the hot sand.
  • Thick eyelashes and nostrils: Protect from sandstorms.
  • Broad, padded feet: Prevent sinking into the sand.

These adaptations allow camels to survive long periods without water and travel across deserts efficiently. Their ability to conserve water and tolerate heat makes them perfectly suited for desert life.

Question 17:
Explain the characteristics of living organisms with suitable examples. How do these characteristics help distinguish living things from non-living things?
Answer:

Living organisms share several key characteristics that distinguish them from non-living things. These include:

  • Growth: Living organisms grow in size and complexity. For example, a seedling grows into a tree.
  • Reproduction: They produce offspring. Humans give birth to babies, and plants produce seeds.
  • Respiration: They respire to release energy. Animals breathe in oxygen, and plants exchange gases.
  • Response to stimuli: They react to their environment. A sunflower turns toward sunlight.
  • Nutrition: They require food for energy. Animals eat plants or other animals, while plants make their food via photosynthesis.

Non-living things, like rocks or water, do not show these characteristics. For instance, a rock does not grow or reproduce. These features help scientists classify organisms as living or non-living.

Question 18:
Describe the habitat and adaptations of a camel. How do these adaptations help it survive in the desert?
Answer:

Camels live in deserts, where conditions are harsh due to extreme heat and scarcity of water. They have unique adaptations to survive:

  • Hump: Stores fat, which provides energy when food is scarce.
  • Long legs: Keep their body away from the hot sand.
  • Thick eyelashes and nostrils: Protect from sandstorms.
  • Water conservation: They can drink large amounts of water at once and lose very little through sweat or urine.

These adaptations help camels survive long journeys in deserts without food or water. For example, their hump allows them to go without eating for days, making them ideal for desert travel.

Case-based Questions (4 Marks) – with Solutions (CBSE Pattern)

These 4-mark case-based questions assess analytical skills through real-life scenarios. Answers must be based on the case study provided.

Question 1:
Rahul observed that earthworms come out during rains. Using NCERT examples, explain why this happens and how it helps them survive.
Answer:
Case Summary

Earthworms surface during rains to avoid drowning in waterlogged soil.

Scientific Principle
  • They respire through moist skin (NCERT Class 6).
  • Waterlogged soil reduces oxygen.
Solution Approach

Like in our textbook, they move to damp surfaces for air. In farms, this behavior improves soil aeration naturally.

Question 2:
A cactus survives in deserts despite less water. Identify adaptations from NCERT and explain how one feature helps it conserve water.
Answer:
Case Summary

Cacti store water in thick stems and have spines.

Scientific Principle
  • Spines reduce transpiration (NCERT Class 6).
  • Waxy coating prevents water loss.
Solution Approach

Our textbook shows spines replace leaves to cut water loss. In deserts, this lets them live for months without rain.

Question 3:
Birds like pigeons can fly but chickens cannot. Compare their body structures using NCERT examples and link one difference to flight.
Answer:
Case Summary

Pigeons have lightweight bones and strong wings.

Scientific Principle
  • Hollow bones reduce weight (NCERT Class 6).
  • Chickens have heavier bodies.
Solution Approach

As we studied, hollow bones help pigeons fly. Chickens, bred for meat, have stronger legs for walking.

Question 4:
Frogs have webbed feet while rabbits do not. Using NCERT, explain how webbed feet help frogs and why rabbits lack them.
Answer:
Case Summary

Frogs swim, while rabbits live on land.

Scientific Principle
  • Webbed feet act like paddles (NCERT Class 6).
  • Rabbits need claws for digging.
Solution Approach

Our textbook shows webbed feet push water. Rabbits, like in burrows, use strong legs to run and dig.

Question 5:
Rahul observed that earthworms come out after rain. Using NCERT examples, explain why this happens and how their moist skin helps them survive.
Answer:
Case Summary

Earthworms surface during rain to avoid drowning as water fills their burrows.

Scientific Principle
  • They breathe through moist skin (NCERT Class 6).
  • Dry skin suffocates them.
Solution Approach

Our textbook shows they absorb oxygen via skin moisture. In gardens, they improve soil like NCERT's compost example.

Question 6:
Priya saw a camouflaged stick insect. How does this adaptation help it survive? Compare with NCERT's chameleon example.
Answer:
Case Summary

Stick insects mimic twigs to hide from predators.

Scientific Principle
  • Camouflage is a survival trait (NCERT Class 6).
  • Chameleons change color similarly.
Solution Approach

We studied how adaptations protect creatures. Like NCERT's chameleon, stick insects avoid detection to survive in forests.

Question 7:
A cactus survives in deserts with spines and thick stems. Relate these features to NCERT's chapter on habitat adaptations.
Answer:
Case Summary

Cacti store water and reduce leaf surface to survive deserts.

Scientific Principle
  • Spines prevent water loss (NCERT Class 6).
  • Thick stems store water like NCERT's desert plants.
Solution Approach

Our textbook shows how desert plants adapt. Cacti spines reduce transpiration, similar to NCERT's examples.

Question 8:
Birds migrate seasonally like the Siberian crane in NCERT. Explain how body shape and hollow bones aid their flight.
Answer:
Case Summary

Migratory birds fly long distances using lightweight bodies.

Scientific Principle
  • Hollow bones reduce weight (NCERT Class 6).
  • Streamlined shape eases flight.
Solution Approach

We studied Siberian cranes in NCERT. Their body shape cuts air resistance, like airplanes, helping migration.

Question 9:
Rahul observed that earthworms come out after rain. Using your knowledge of habitat adaptation, explain why this happens and how it helps them survive.
Answer:
Case Summary
Earthworms surface during rain due to waterlogged soil.
Scientific Principle
We studied that earthworms breathe through moist skin. Waterlogged soil fills air gaps, making it hard to breathe.
Solution Approach
  • They move up to avoid suffocation (NCERT example)
  • Moist skin helps absorb oxygen from air

This adaptation prevents drowning, similar to how fish use gills in water.

Question 10:
A cactus survives in deserts while a lotus grows in water. Compare their structural adaptations using NCERT examples.
Answer:
Case Summary
Plants adapt differently to extreme habitats.
Scientific Principle
Our textbook shows cactus has spines (modified leaves) to reduce water loss, while lotus has hollow stems for floatation.
Solution Approach
  • Cactus stores water in thick stem (NCERT Fig. 9.9)
  • Lotus leaves have waxy coating to repel water

These features help them survive in their specific environments.

Question 11:
During a forest trip, students saw camouflaged insects on tree bark. Explain this phenomenon with one NCERT and one real-world example.
Answer:
Case Summary
Insects blend with surroundings for protection.
Scientific Principle
We studied that camouflage helps animals hide from predators (NCERT Chapter 9).
Solution Approach
  • Stick insects mimic twigs (NCERT example)
  • Chameleons change color to match environment

This adaptation increases survival chances, like soldiers wearing camouflage uniforms.

Question 12:
Design an experiment to show how birds' beaks are adapted to their food habits. Use the NCERT hummingbird example.
Answer:
Case Summary
Different beak shapes suit different diets.
Scientific Principle
Our textbook shows hummingbirds have long beaks for nectar (NCERT Fig. 9.6).
Solution Approach
BirdBeak TypeFood
EagleHookedMeat
SparrowShortSeeds

This proves beaks evolve based on food sources.

Question 13:

Rahul observed two organisms in his garden: an earthworm and a butterfly. He noticed that the earthworm moves by contracting and expanding its body, while the butterfly has wings to fly.

Based on your understanding of characteristics of living creatures, answer the following:

  • How does the movement of an earthworm differ from that of a butterfly?
  • Name one other organism that moves like an earthworm and one that moves like a butterfly.
Answer:

Earthworms move by contracting and expanding their muscular body segments, which helps them crawl through soil. This movement is called peristalsis.

Butterflies, on the other hand, have wings and fly using their flight muscles.


Another organism that moves like an earthworm is a leech (it also uses peristaltic movement).

Another organism that moves like a butterfly is a housefly (it also uses wings to fly).

Question 14:

Priya set up an experiment with two plants: one was watered regularly, and the other was not watered at all. After a week, she observed that the unwatered plant had wilted.

Based on this observation, answer:

  • Why did the unwatered plant wilt?
  • Name two other characteristics of living organisms that this experiment demonstrates.
Answer:

The unwatered plant wilted because it lacked water, which is essential for photosynthesis and maintaining turgidity in plant cells.


This experiment also demonstrates two other characteristics of living organisms:

  • Response to stimuli: The plant responded to the lack of water by wilting.
  • Growth and nutrition: Without water, the plant could not grow or perform photosynthesis.
Question 15:
Rahul observed a creature in his garden that had six legs, a hard outer covering, and could fly. He also noticed it laying eggs. Based on these observations, answer the following:
a) Identify the group this creature belongs to.
b) List two other characteristics of this group.
Answer:

a) The creature belongs to the group insects because it has six legs, a hard outer covering (exoskeleton), and can fly, which are key features of insects.

b) Two other characteristics of insects are:

  • They have a three-part body: head, thorax, and abdomen.
  • They undergo metamorphosis (life cycle changes like egg → larva → pupa → adult).

Insects are the most diverse group of animals on Earth, with over a million known species!

Question 16:
Priya saw an animal near a pond with moist skin, webbed feet, and the ability to live both in water and on land. Answer the following:
a) Name the group this animal belongs to.
b) Explain one adaptation that helps it survive in water.
Answer:

a) The animal belongs to the group amphibians because it has moist skin, webbed feet, and can live in both water and land.

b) One adaptation that helps amphibians survive in water is their moist skin, which allows them to breathe underwater through cutaneous respiration (absorbing oxygen directly through their skin).
Additionally, their webbed feet help them swim efficiently.

Amphibians, like frogs, are important indicators of environmental health because their sensitive skin reacts to pollution.

Question 17:
Rahul observed a creature in his garden that had six legs, a hard outer covering, and could fly. He wondered if it was a living organism.

Based on the characteristics observed, identify the creature and explain why it is considered a living organism.

Answer:

The creature observed by Rahul is an insect, most likely a bee or beetle, as it has six legs and can fly. It is considered a living organism because it exhibits the following characteristics of living things:

  • Movement: It can fly, showing locomotion.
  • Growth: Insects grow by molting their hard outer covering (exoskeleton).
  • Reproduction: They lay eggs to produce offspring.
  • Response to stimuli: Insects react to light, sound, or touch.

Additionally, insects have a life cycle (egg, larva, pupa, adult) and require food for energy, confirming they are living beings.

Question 18:
Priya noticed that a plant in her balcony bends towards sunlight during the day. She wondered how this happens.

Explain the process and the significance of this behavior in plants.

Answer:

The bending of the plant towards sunlight is called phototropism, a growth response to light. Here’s how it works:

1. Auxin hormone accumulates on the shaded side of the plant stem.
2. This hormone causes cells on that side to elongate faster.
3. The uneven growth makes the stem bend towards the light.

Significance:

  • Helps plants maximize photosynthesis by exposing more leaves to sunlight.
  • Ensures better growth and energy production for survival.

This behavior is a key adaptation in living organisms to respond to their environment.

Question 19:
Rahul observed a creature in his garden that had six legs, a hard outer covering, and could fly. He also noticed it laying eggs near a plant. Based on these characteristics, identify the group this creature belongs to and explain two key features of this group.
Answer:

The creature observed by Rahul belongs to the group insects. Insects are a class of arthropods with distinct features:

  • Six legs: All insects have three pairs of jointed legs, which help them walk, jump, or cling to surfaces.
  • Hard exoskeleton: Their body is covered by a tough outer layer called an exoskeleton, made of chitin, which provides protection and support.

Additionally, insects like this one lay eggs and often undergo metamorphosis (e.g., butterfly life cycle). Their ability to fly is due to wings, another key feature of many insects.

Question 20:
Priya saw an animal near a pond with smooth, moist skin, webbed feet, and no tail. It was hopping and catching insects. Help her classify this animal and describe how its features help it survive in its habitat.
Answer:

The animal Priya observed is a frog, which belongs to the group amphibians. Frogs have adaptations suited for their aquatic and terrestrial lifestyle:

  • Smooth, moist skin: Helps in cutaneous respiration (breathing through skin) underwater and prevents drying out on land.
  • Webbed feet: Assist in swimming efficiently in water.

Frogs lack tails as adults (unlike tadpoles) and use their strong hind legs to hop and catch prey like insects. Their sticky tongue aids in grabbing food quickly. These features make frogs well-adapted to live near ponds.

Question 21:
Rahul observed that a fish in his aquarium keeps opening and closing its mouth and gills frequently. He wondered why this happens. Explain the process and its importance for the fish.
Answer:

The fish opens and closes its mouth and gills to breathe underwater. This process is called respiration in aquatic animals. Here’s how it works:

1. The fish takes in water through its mouth, which contains dissolved oxygen.
2. The water passes over the gills, where tiny blood vessels absorb the oxygen.
3. The carbon dioxide produced by the fish is released back into the water through the gills.
4. The water then flows out of the gill openings.

This process is crucial because fish cannot breathe air like humans. Their gills are specially adapted to extract oxygen from water, allowing them to survive underwater.

Question 22:
Priya noticed that a cockroach moved quickly when she switched on the light, but a snail did not react. Explain the difference in their behavior based on their characteristics.
Answer:

The difference in their behavior is due to their unique characteristics as living creatures:

Cockroach:
1. It has a hard outer covering called an exoskeleton and jointed legs for fast movement.
2. It is sensitive to light and can detect changes quickly due to its compound eyes and antennae.
3. It is a fast-moving insect that reacts instantly to avoid danger.

Snail:
1. It has a soft body protected by a shell and moves slowly using a muscular foot.
2. It lacks quick reflexes and does not respond rapidly to light changes.
3. Its slow movement is due to its body structure and lack of limbs.

These differences show how animals adapt to their environment based on their characteristics.

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