1) We should reduce the use of the plastic bags, bottles etc. because: a) They are not durable b) They are non-biodegradable c) They are made of toxic materials d) They react with the atmospheric gases 2) In a food chain the second trophic level is occupied by: a) Carnivores b) Autotrophs c) Herbivores d) Producers 3) Green plants utilize ……… percent of sun’s energy to prepare their food by the process of photosynthesis? a) 1 percent b) 10 percent c) 20 percent d) 99 percent 4) The process of accumulation of harmful chemical substances like pesticides, in the body of living organisms at each trophic level of a food chain is known as a) Biological magnification b) Biological accumulation c) Chemical magnification d) Chemical accumulation 5) Global warming is a phenomenon related to a) Evaporation b) Ecological balance c) Greenhouse effect d) Desertification

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