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What would happen to the number of rabbits and grass plants if the number of foxes decreased?
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What would happen to the number of grass plants and foxes if the number of rabbits increased?
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What would happen to the number of grass plants and foxes if the number of rabbits decreased?
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Match the terms given in column I with the terms given in column II and column III having the same meaning :
| Column I | Column II | Column III |
| (1) Secondary consumer | Herbivore | 1st trophic level |
| (2) Primary consume | Autotroph | 3rd trophic level |
| (3) Producer | Carnivore | 4th trophic level |
| (4) Tertiary consumer | Large carnivore | 2nd trophic level |
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Give one example of a food chain having four organisms. Below each organism write the three appropriate terms from the part (a) above which you think it represents.
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Write the percentage of energy transferred from autotrophs to the next level in a food chain.
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Name the process in which a harmful chemical enters the food chain and gets concentrated at each trophic level.
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In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemicals be maximum?
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If a harmful chemical enters a food chain comprising cat, mice and plants, which one of these organisms is likely to have the maximum concentration of the harmful chemical in its body?
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If 5 joules of energy is available at producer level (plants), then how much energy will be transferred to the lion in the following food chain?
Plants → Goat → Lion
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The following statement is true or false :
Only 10 per cent of the light energy given by the sun is available for transfer at each higher trophic level in a food chain.
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Why are there rarely more than five links (or five organisms) in a food chain?
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Name two predators of snakes in a food web operating in a forest ecosystem.
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Fill in the following blank with suitable word :
Pesticides enter the food chain at the ...........level
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Fill in the following blank with suitable word :
Grass → ........... → Human
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Fill in the following blank with suitable word :
Lettuce → ............. → Fox
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Fill in the following blank with suitable word :
Plants → Antelope → ............
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What is ten per cent law? Explain with an example.
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Explain how harmful chemicals enter our bodies.
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'If we excessively use pesticides to protect the crops from diseases, then it may cause long-term damage to mankind'. Justify this statement.
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