65.Deficiency of which elements cause delay in flowering?
The deficiency of elements like N, S, Mo cause delay in the 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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