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Explain the term eutrophication with suitable example
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Name one property of liquids and gases which tells us that their molecules are moving constantly.
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How does chemical nature of the soil change due to continued use of chemical fertilizers ?
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Explain various methods of fertilizer application
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Distinguish between farmyard manure and compost manure.
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Fill in the following blank with suitable words :
The arrangement of particles is less ordered in the ______ state. However, there is no order in the ______ state.
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Define manure. What are different manures and how do they affect the soil ?
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What is green manuring ? Give suitable examples for green manures.
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What are fertilizers ? Classify 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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