Friday, 13 July 2018

CBSE Class 10 - Biology - Our Environment - Revision Assignment (#cbsenotes)(#eduvictors)

Biology - Our Environment 

Revision Assignment

CBSE Class 10 - Biology - Our Environment - Revision Assignment (#cbsenotes)(#eduvictors)


1. Using Kulhads as disposable cups to serve tea in trains, proved to be a bad idea. Why?

2. Why is plastic not degraded by bacteria?


3. DDT has entered the food chain. Which food habit is safer- vegetarian or non-vegetarian?

4. Classify the flowing as decomposers and producers Green plants, bacteria, fungi, algae, blue-green algae.

5. Distinguish between producers and consumers.

6. Name two environment-friendly practices.

7. Write any two ways of energy flow through an ecosystem.


8. It is the responsibility of the government to arrange for the management and disposal of waste. As an individual, you have no role to
play. Do you agree? Support your answers with two reasons.

9. How will the accumulation of biodegradable waste affect our environment?

10. Aquarium requires regular cleaning whereas lakes normally do not. Why?

11. How is ozone depletion caused? Name the compounds causing it.

12. What is meant by biodegradable waste? Which of the following is biodegradable? Agriculture residue, plastic, insecticides, sewage.

13. What is being done to avoid ozone depletion? ( Three steps)

14. What is meant by a trophic level? Why do we have a greater number of organisms at lower levels?

15. Differentiate between biodegradable and non-biodegradable with respect to the effect of biological processes on them and the way they affect our environment.

16. Which level shows the maximum biological magnification? Why?

17. If 1000 KJ energy is available at the producer level, how much energy will be available at first carnival level?

18. Why do most food chains have 3-5 steps only?

19. Select the biodegradable items from the list given blow-Polythene bags, old clothes, wilted flowers, pencil shavings, glass bangles, bronze statue, vegetable peels.

20. What will impact on ecosystem if bacteria and fungi are removed from the Environment?


21. Describe any five modes of disposal of wastes.

22. Express your feelings on the picture has given down below. What will happen if all Carnivores are eliminated from the environment? What measures will you take to save Tiger?

☛See also:
Ch 15 - Our Environment
Ch15 - Our Environment (Worksheet) 
Ch15 - Our Environment (MCQs)
Ch 15 - Our Environment - Quiz-1
Ch 15 - Our Environment - Quiz-2