1) Grassland, forest, desert, mountains, ponds, river together form a...... a) Environment b) Ecosystem 2) Every food chain in the ecosystem begins with a) Saprophytes b) Parasites c) Producers d) Herbivores 3) We should reduce the use of plactics .... Etc. Because a) They are not durable b) They are made of toxic materials c) They react with the atmospheric gases d) They are non-biodegradable 4) Which among the following statements is incorrect in view of the plants? a) They are also called producers. b) They prepare their food from organic compounds c) They convert the solar energy into mechanical energy d) They are the source of energy 8n a food chain 5) Which of the following chemicals causes depletion of the ozone layer? a) Carbon tetrachloride b) Methane c) Chloro fluoro carbon d) Carbon monoxide 6) In a food chain, the third trophic level is always occupied by... a) Herbivore b) Carnivore c) Decomposer d) Producer 7) Which one of the following is an artificial ecosystem? a) Lake b) Forest c) Pond d) Crop field 8) Which of the two in the following sets belong to the same trophic level? a) Grass; grasshopper b) Goat; spider c) Hawk; rat d) Frog; lizard 9) What will happen if all the deer are killed in the given food chain? Grass-deer-lion  a) The population of lions decreases and grass increases b) The population of lions remains unchanged c) The population of grass decreases d) The population of lions increase 10) The depletion of the ozone layer causes a) Global warming b) Increased uv rays c) Earthquake d) Acid rain

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