KSEEB SSLC Science Solutions for Chapter 8 Our environment

KSEEB SSLC Science Solutions for Chapter 8 Our environment

LearnFatafat offers free SSLC Science Solutions for Chapter 8 Our environment. Chapter covers the topics like ecosystems and its components, food chain and webs, effects of our activities on environment and more. Check video lessons, notes and MCQ quizzes for SSLC Science Chapter 8 Our environment click here to buy.

SSLC Science Solutions for Chapter 8 Our Environment

1. Which of the following groups contain only biodegradable items?

(a) Grass, flowers and leather

(b) Grass, wood and plastic

(c) Fruit-peels, cake and lime-juice

(d) Cake, wood and grass

Answer: (c), (d)

2. Which of the following constitute a food-chain?

(a) Grass, wheat and mango (b) Grass, goat and human (c) Goat, cow and elephant (d) Grass, fish and goat

Answer: (b)

3. Which of the following are environment-friendly practices?

(a) Carrying cloth-bags to put purchases in while shopping (b) Switching off unnecessary lights and fans (c) Walking to school instead of getting your mother to drop you on her scooter (d) All of the above

Answer: (d)

4. What will happen if we kill all the organisms in one trophic level?

Answer: Killing of organisms in one trophic level will disturb the food chain of the ecosystem. It will result in death of higher animals. This could lead in collapsing of ecosystem.

5. Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?

Answer: Yes, impact of removing all organisms in a trophic level will be different for different organisms. However, it is not possible that organisms of any trophic level will be removed without causing damage to the ecosystem.

6. What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?

Answer: Biological magnification is accumulation of chemicals in the body of organisms at different levels of food chain. Yes, the level of biological magnification will be different at different levels of ecosystem.

7. What are the problems caused by the non-biodegradable wastes that we generate?

Answer: Following are some problems caused due to non biodegradable waste –

  • Cause air and soil pollution as they remain for longer time in environment.
  • Cannot be decomposed by microorganisms
  • Increase in their quantity causes disposal problem
  • Fertility of soil is highly affected
  • If consumed by cattles, it causes fatal to their life

8. If all the waste we generate is biodegradable, will this have no impact on the environment?

Answer: Yes, it will have impact on environment. Large amount of biodegradable waste will be decomposed by bacteria and other microorganisms, in this process, lots of greenhouse gases will be released in the environment. This will affect global warming.

9. Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?

Answer: Ozone layer in earth’s atmosphere prevent life on earth from harmful ultraviolet rays of sun. These rays are cancer causing, can damage eyes and immune system. Thus, damage to ozone layer is a matter of concern. Reduction in use of CFCs in refrigerators, fire extinguishers, sprays, etc is necessary to limit the damage to ozone layer.

KSEEB SSLC

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Chapter 8 – Our Environment

8.01 Our Environment

8.02 Ecosystem and Its Components

8.03 Food Chains and Webs

8.04 Effects of Our Activities on Environment