Answer:
(a) The plants try to
supply more nutrients to its younger leaves than the older leaves. When nutrients
are mobile, the deficiency symptoms are shown by the older leaves first because
that particular nutrient reaches the top first and lower leaves does not get
that nutrient.
(b) Highly mobile
elements are P, K and Mn. Less mobile elements are and .
(c) The
aspect of mobility of essential elements is important in horticulture and
agriculture in the following ways
(i) A crop
in which older leaves are harvested if show deficiency symptoms, will decrease
its economic value.
(ii) The
crops in which flowers, fruits and inflorescence are harvested, the immobile nutrients
will not reach to the apex/tip because of immobility, so this will reduce the
yield.
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