1) Every food chain in the ecosystem begins with………. which are the original source of food. a) Saprophytes b) Parasites c) Producers  d) Herbivores 2) In a food chain the second trophic level is occupied by: a) Producers b) Herbivores  c) Carnivores d) Autotrophs 3) Green plants utilize ……… percent of sun’s energy to prepare their food by the process of photosynthesis? a) 10% b) 1% c) 99% d) 100% 4) If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be: a) 100J b) 1J c) 10J d) 99J 5) The substance which is chiefly responsible for the depletion of ozone layer is: a) Oxygen b) CFCs c) Methane d) DDT 6) Global warming is a phenomenon related to: a) Evaporation  b) Ecological Balance c) Desertification d) Green House Effect

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