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Give a brief account of the discovery of the cell.
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Mention differences between light microscope and electron microscope.
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Write down the differences between the nucleus and nucleoid.
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Write down the differences between organ and organelle.
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Distinguish between prokaryotic and eukaryotic cells.
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Why is irrigation essential?
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Explain why a legume crop does not require nitrogenous fertilizers?
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Give a short account of biofertilizers.
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What are fertilizers? Classify fertilizers.
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What is green manuring? Give suitable example for green manures.
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Distinguish between farmyard manure and compost manure.
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Explain various methods of fertilizer application.
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Explain the term eutrophication with suitable example.
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Write down two advantages of fertilizer over manure.
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Give two limitations of using manure.
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