a)Positive phototropism
b)
i) Shoot tip/ apex curved towards the source of light; Rej shoot tip
bent;
ii) Shoot increased in height;
iii)
-Auxins are sensitive to light;
-auxins migrated to the non-illuminated side;
-higher concentration of auxins at the non-illuminate side
-promotes cell division hence cell elongation ;
-thus rapid growth ;
-shoot increased in height due to primary growth / rapid mitotic cell
-division of meristemic cells present in the shoot apex;
iv)A tall thin shoot with small yellow leaves would form i.e. etiolation;
marto answered the question on September 25, 2019 at 08:53
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