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The diagram below shows an experiment set up using a seedling enclosed in a desk box with a hole on one side at the beginning...

      

The diagram below shows an experiment set up using a seedling enclosed in a desk box with a hole on one side at the beginning of the experiment and after five days of growth.

shoot.png

(a) What type of response is shown by the above shoot?

(b) State two observable changes which took place in the seedling after five days of growth.

(c) Account for the observable changes in (b) above

(d) What observations would be made after five days of growth if the shoot was placed in a box without a hole on one side?

  

Answers


Martin
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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