Questions: (1 mark each)
Q1. Suggest a food chain in which one of the trophic levels is occupied by human beings.
Q2. Draw the conclusion for if all the herbivores are removed from the grassland.
Q3. From the following list find out the organism which is likely to have maximum concentration of pesticide in its body: grass, grass- hopper, frog, snake and hawk.
Q4. Propose a way to dispose off vegetable peels, so that the environment is not polluted.
Q5. In an ecosystem, rats feed on grains. Name the trophic level to which the rats belong.
Q6. Name two chemicals which are responsible for thinning of ozone layer.
Q7. What is the function of zone in the upper atmosphere?
Q8. List two human- made (artificial) ecosystems.
Q9. Name two gases which have replaced CFCs.
Questions: (2 marks each)
Q1. Aquarium needs to be cleaned once in a while whereas ponds or lakes do not require any cleaning. Explain.
Q2. Accumulation of harmful chemicals in our bodies can be avoided. Explain how this can be achieved.
Q3. What will happen if all the deers are removed in the given food chain?
Plants → deers → tigers
Q4. Explain the formation of ozone in the higher levels of atmosphere, giving relevant chemical equations.
Q5. There is a need to dispose waste in a proper manner. Justify this statement giving reasons.
Q6. What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
Q7. What is the role of decomposers in the ecosystem?
Q8. Give any two ways in which biodegradable substances would affect the environment.
Q9. Give any two ways in which non- biodegradable substances would affect the environment.
Q10. 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?
Q11. What are the problems caused by the non- biodegradable wastes that we generate?
Q12. What will happen if we kill all the organisms in one trophic level?
Q13. What is biological magnification? Will the levels of the magnification be different at different levels of the ecosystem?
Q14. If all he waste we generate is biodegradable, will this have no impact on the environment?