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Chapter: 3rd Science : Term 3 Unit 1 : Our Environment

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3rd Science : Term 3 Unit 1 : Our Environment : Text Book Back Exercises Questions with Answers, Solution, Evaluation; Choose the correct answer, Fill in the blanks, Say True or False, Match the following, Short Answers, Answer briefly, Answer in detail, Questions based on higher order thinking, Student Activities, Student Project

Our Environment ( Term 3 Chapter 1 | 3rd Science)



1. Which of these is an example for biotic factor?

a. Water

b. Goat

c. Air

Answer : b. Goat


2. Our environment is surrounded by _______

a. biotic factors

b. abiotic factors

c. both biotic and abiotic factors

Answer : c. both biotic and abiotic factors


3. Human beings depend on _______ for their food.

a. plants

b. soil

c. wood

Answer : a.plants


4. ________are the primary producers.

a. Non green plants

b. Green plants

c. Dry leaves

Answer : b. Green plants


5. Which is an example for decomposer?

a. Mango tree

b. Bacteria

c. Deer

Answer : b. Bacteria


6. Which of these living things would die if there were no green plants on earth?

(a) a and c only

(b) b and d only

(c) d and a only

(d) a, b, c and d

Answer : (d) a, b, c and d


II. Fill in the blanks.

1. Cow is a consumer. (Cow / Soil )

2. A young plant is known as sapling . ( tree / sapling )

3. Planting of sapling provides oxygen (oxygen / land )

4. World Environment Day is June 5th ( June 15th / June 5th )

5. Decomposers get food from dead plants and animals. ( Decomposers / Producers ).


III. Match the following.

1. Stone - Consumer

2. Bacteria - Abiotic factor

3. Plants - Decomposer

4. Buffalo - Producers


1. Stone - Abiotic factor

2. Bacteria - Decomposer

3. Plants - Producers

4. Buffalo - Consumer


IV. Say true or false.

1. Abiotic factors are important for biotic factors. (True)

2. River is an example for biotic factor. (False)

3. ‘Van Mahotsav’ is organised during the first week of July every year. (True)

4. Plants are the consumers. (False)

5. Plants provide food and shelter to living things. (True)


V. Answer the following.

1. Vijay placed two things ‘P’ and ‘R’ (one living and one non-living) in separate cages with food and water.

a. Which thing is likely to be a living thing? Give reason for your answer.

P thing is likely to be living thing. Because the weight increases from week 1 to week 4

b. What will be the weight of living thing in week 6?

12 kg

2. Write two examples for biotic and abiotic factors.

Biotic - Plants, Human beings

Abiotic - Water, Sun

3. Write any three differences between living and non-living things.

Living things

They can breathe and grow

They need food to live

They can feel

Non -living things

They cannot breathe and

They do not need food to live

They cannot feel

4. List the abiotic factors needed for insects.

Air, Soil

5. What are the biotic factors of a balanced ecosystem?

The biotic factors of a balanced ecosystem are producers, consumers and decomposers.

6. Why plants are called primary producers?

Green plants make their own food by the process of photosynthesis. Hence, they are called primary producers.

7. Write any four benefits of plants.

i) Provide oxygen for breathing

ii) Provide food and shelter to living things

iii) Help in bringing rainfall

iv) Offer a good environment to live.


VI. Project

Make an album by collecting pictures of different kinds of biotic and abiotic factors.

Let Us Try

1. Write the names of the animals that you see in the previous page picture.

Cow Buffalo Goat

Rabit Monkey Turtle

2. Classify the following into natural things and man-made things.

(Dam, river, coconut tree, building, jasmine flower, hill, cloud, silver vessel, cell phone, temple, cake, air, sun, ship, water, pencil, book, doll, football, sunflower, crocodile, aeroplane)

Natural things: River, hill, cloud, air, sun, water, coconut tree, jasmine flower, sun flower, crocodile

Man-made things: Dam, building, silver vessel, cell phone, temple, cake, ship, pencil, book, doll, foot ball, aeroplane

Let Us Enjoy

Shall we mimic like the animals?

Crow, Cuckoo, Elephant, Parrot, Donkey, Cow, Goat, Dog

Let Us Connect

Match the following sources with their products and uses.

Let Us Try

1. Classify the following as Biotic / Abiotic factors.

2. Think and Answer

a. A swing goes to and fro. Is it living or non-living?

Answer: non-living

b. We get wood from trees which are the living things. A chair is made from wood. Is the chair a living thing or a non-living thing?

Answer: non-living thing

Try to Answer

Look at the picture and answer the question.

Which of the non-living things can float?

a. Iron rod

b. Stone

c. Air filled ball

d. Coin

Answer: c. Air filled ball

Let Us Try

The following statements describe some of the characteristics of living things. Identify and write the characteristic features using the given hints.

(Characteristics Hints: Move, Breathe, Feel, Needs Food, Grow, Reproduce)

Let Us Play

Divide the class into two groups and ask the first group to write any five biotic factors and the second group to write any five abiotic factors seen around the school.

Write the needs of the following.

1. Birds : Air, Water, Sunlight, Insects, Trees

2. Insects : Soil, Air, Plants, Small creatures

3. Human beings: Air, Water, Plants, Sunlight, Animals.

Let Us Discuss

1. There is a large banyan tree in a park. Monkeys and birds have made the tree their home. Humans too spend time under the tree. Discuss with your friends, how the tree, monkeys, birds and humans are interdependent.

Birds and monkeys feed on the fruit. Birds build their nests in the tree. The tree gives shade to human beings when the day is hot. The wood of the tree is useful to human beings. The droppings of the birds are a manure to the tree. Birds play a vital role in dispersal of seeds. Thus the tree, monkeys, birds and human beings are interdependent.

2. Why is plant the most important living thing?

Because they make food from abiotic factors.

3. Discuss in a group and create an interlink of living and non-living factors.

Biotic and abiotic factors are linked to each other by the flow of energy through food.

Let Us Try

1. Write the abiotic factors needed for the following biotic factors to survive.

(Air, Water, Sunlight, Soil, Land, Wheat, Fruits, Grass, Hen)

a. Animals: Air, Water, Sunlight, Land, Grass

b. Plants: Air, Water, Sunlight, Soil

c. Human beings: Air, Water, Sunlight, Land, Wheat, Fruits, Hen

2. An animal that

a. flies in the air is: aerial

b. lives in water is: aquatic animals

c. moves on the ground is: Terrestrial animals

d. eats only plants is: Herbivores

Let Us Try

Classify the following biotic factors.

(Tulsi, Fungi, Mango tree, Rabbit, Eagle, Cat, Dog, Cucumber plant, Human, Grass, Crocodile, Crow, Bacteria)

Producers Tulsi, Mango tree, Cucumber plant, Grass

Consumers Rabbit, Eagle, Cat, Dog, Human, Crocodile, Crow

Decomposers Fungi. Bacteria

Let Us Discuss

1. Let us discuss and write.

Plants and human beings are living things. Why do human beings depend on plants?

Human beings obtain food from plants and oxygen for respiration. So they depend on plants.

2. Divide the students into three groups and give them some pictures of living things. Ask them to classify the pictures based on their food habits.

3. Take your students outside the classroom or to a park. Ask them to note down the producers and consumers they could identify there.

Let Us Try

The names of several natural resources are hidden in the box below. Find as many as possible. Some words are repeated.

Let us Connect

Link the animals as herbivores, carnivores and omnivores.

Let Us Do

A. Write any two uses of trees.

1. Help in bringing rainfall

2. Provide oxygen

B. Conduct an awareness campaign on ‘Save Our Environment’.

C. Plant saplings in your school campus.

D. Preparation of seed ball

Take some clay, humus, add water and mix well. After mixing, place the available seeds inside them and make a seed ball. Then dry and keep it safe. Distribute the seed balls to public on special occasions of your school.

E. Write some slogans on ‘Save Plants’ and paste them on the tree in your school campus/road sides. (E.g., Take care of the Earth and it will take care of you. It’s not yours, nor mine, it’s ours)

1. Trees look fair, they clean the air.

2. Forests are our wealth. They preserve our health.

The nature of our future depends on the future of our nature.

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