Our Environment | Term 3 Chapter 1 | 3rd Science
I. Choose the correct answer.
1. Which of these is an example for biotic factor?
b. Goat
c. Air
2. Our environment is surrounded by _______
b. abiotic factors
c. both biotic and abiotic factors
3. Human beings depend on _______ for their food.
b. soil
c. wood
4. ________are the primary producers.
b. Green plants
c. Dry leaves
5. Which is an example for decomposer?
b. Bacteria
c. Deer
6. Which of these living things would die if there were no green plants on earth?
(b) b and d only
(c) d and a only
(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.
Questions:
2. Bacteria - Abiotic factor
3. Plants - Decomposer
4. Buffalo - Producers
Answer:
1. Stone - Abiotic factor2. 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.
b. What will be the weight of living thing in week 6?
2. Write two examples for biotic and abiotic factors.
Abiotic - Water, Sun
3. Write any three differences between living and non-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.
5. What are the biotic factors of a balanced ecosystem?
6. Why plants are called primary producers?
7. Write any four benefits of plants.
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.
1. Write the names of the animals that you see in the previous page picture.
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)
Man-made things: Dam, building, silver vessel, cell phone, temple, cake, ship, pencil, book, doll, foot ball, aeroplane
Shall we mimic like the animals?
Crow, Cuckoo, Elephant, Parrot, Donkey, Cow, Goat, Dog
Match the following sources with their products and uses.
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?
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?
Look at the picture and answer the question. Which of the non-living things can float?
b. Stone
c. Air filled ball
d. Coin
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)
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.
1. Birds :
2. Insects :
3. Human beings:
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.
2. Why is plant the most important living thing?
3. Discuss in a group and create an interlink of living and non-living factors.
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
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
1. Let us discuss and write.
Plants and human beings are living things. Why do human beings 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.
The names of several natural resources are hidden in the box below. Find as many as possible. Some words are repeated.
Link the animals as herbivores, carnivores and omnivores.
A. Write any two uses of trees.
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)
2. Forests are our wealth. They preserve our health.
The nature of our future depends on the future of our nature.
