Question 1. Aquarium needs to be cleaned once in a while whereas ponds or lakes do not require any cleaning. Explain. Question 2. Accumulation of harmful chemicals in our bodies can be avoided. Explain how this can be achieved. Question 3. What will happen if all the deers are removed in the given food chain? Plants → deers → tigers Question 4. Explain the formation of ozone in the higher levels of atmosphere, giving relevant chemical equations. Question 5. There is a need to dispose of waste in a proper manner. Justify this statement giving reasons. Question 6. What are trophic levels? Give an example of a food chain and state the different trophic levels in it. Question 7. What is the role of decomposers in the ecosystem? Question 8. Give any two ways in which biodegradable substances would affect the environment. Question 9. Give any two ways in which non- biodegradable substances would affect the environment. Question 10. To protect the food plants from insects, an insecticide were sprayed in small amounts but it was detected in high concentration in human beings. How did it happen?
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