61.Give a brief account about soil fertility and its depletion.
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62. What are protoplasmic elements ?
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63.Give the significance of culture experiment.
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64.Give the term for- The concentration of the essential element below which plants growth is retarded
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65.Deficiency of which elements cause delay in flowering?
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66.Why is there a need for application of fertilisers ?
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67.Name the elements which are not essential for plants but are essential for animals.
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68.Nitrogen is an essential element for plants and is found in abundance as atmospheric nitrogen. But most plants are unable to use it. Why is it so and in what form do plants utilise nitrogen?
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69.Who developed hydroponics ?
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70.Name the element which is mineral and non-mineral.
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