Question

A plant is kept in dark cupboard for about forty eight hours before conducting any experiment on Photosynthesis in order to :
a) Remove chorophyll from leaves
b) Remove starch from leaves
c) Ensure that no photosynthesis occurred
d) Ensure that leaves are free from the starch

Answer 1

"Option (d) i.e. ensure that leaves are free from the starch is the correct answer.

Since the plant is kept in the dark for 48 hours, it cannot prepare photosynthesis as there is no sunlight to help it make food.

In those 48 hours the starch stored in the leaves is stored up, thus making leaves free of starch.

"

Answer 2

Answer :

Option (B)

It is important to destarch/ remove the starch from the leaves before starting experiment on photosynthesis since use of destarched leaf can only prove that light/ carbon dioxide is indispensable for photosynthesis.