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What are fertilizers?
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Give a short account of biofertilizers.
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Explain why a legume crop does not require nitrogenous fertilizers ?
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Why is irrigation essential?
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How does excessive irrigation lead to soil salinity ?
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Mention three effects of excessive irrigation.
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Why water should be used judiciously ?
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Explain advantages of irrigation.
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Explain, how efficiency of irrigation can be increased.
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State two characteristic properties of a liquid.
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When a crystal of copper sulphate is placed at the bottom of a beaker containing water, the water slowly turns blue. Why?
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Explain the objectives of mixed cropping.
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Distinguish between mixed cropping and intercropping.
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Explain the advantages of mixed cropping.
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How does intercropping differ with mixed cropping?
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Write down disadvantages of crop rotation.
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Write about three main criteria which should be considered while selecting the crops for rotation?
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Why are leguminous crops desirable in crop rotation?
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Explain various steps in hybridization of crop plants.
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Define plant breeding?
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