| 1. | Which of the following chemicals causes depletion of the ozone layer ? | |
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Chloro fluoro carbon
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Carbon monoxide
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Methane
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Carbon tetrachloride
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Report Question| 2. | The UV radiation from the sun is likely to cause _____________ in human ? | |
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Brain Cancer
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Liver Cancer
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Skin cancer
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Lung cancer
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| 3. | Which of the two in the following sets belong to the same trophic level ? | |
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Hawk ; Rat
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Frog ; Lizard
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Goat; Spider
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Grass; Grasshopper
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| 4. | Which one of the following is an artificial ecosystem ? | |
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Pond
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Crop field
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Forest
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Lake
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| 5. | In the garden ecosystem, which of the following are producers ? | |
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Rabbits
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Grasses
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Snakes
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Insects
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| 6. | What will happen if all the deer are killed in the given food chain Grass -> Deer -> Lion ? | |
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The population of lions remains unchanged.
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The population of lions increases.
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The population of lions decreases and grass increases.
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The population of grass decreases.
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| 7. | In the given food-chain if the amount of energy at the fourth trophic level is 4 kJ, what will be the energy available at the producer level ? Grass -> Grasshopper -> Frog -> Snake ? | |
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400 kJ
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4000 kJ
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40 kJ
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4 kJ
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| 8. | In the given food-chain if the amount of energy at the fourth trophic level is 4 kJ, what will be the energy available at the producer level ? Grass -> Grasshopper -> Frog -> Snake ? | |
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400 kJ
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4000 kJ
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40 kJ
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4 kJ
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| 9. | A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in ? | |
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fish
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birds
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man
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green plants
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