A student first keeps a potted plant having green leaves in a dark room for more than 3 days. He then takes out this potted plant from the dark room and places it in bright sunshine for about 3 days.
(a) Which substance present in the green leaves is all used up when the potted plant is kept in a dark room?
(b) What is this process known as?
(c) Which plant process uses up all the above substance from green leaves when the potted plant is kept in the dark room?
(d) Which process does not take place in the green leaves of the plant when it is kept in the dark room?

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Solution

(a) When the plant is kept in dark, the starch which is already present in the plant gets used up.
(b) This process is known as destarching.
(c) The process of cell metabolism in plants requires starch.
(d) The process of photosynthesis does not occur when the plant is kept in the dark room. Photosynthesis is the process by which plants synthesise glucose which is eventually stored as starch.

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