(i) Photosynthesis is the physiological process that is occurring in the green plant which kept the mouse alive.
(ii) Photosynthesis is the process by which living plant cells containing chlorophyll produce food substances like glucose and starch from carbon dioxide and water by using light energy. Plants release oxygen gas during this process which is a life supporter for the living organisms on the earth'* surface.
(iii) In bell jar B, there is no green plant so no oxygen is produced by photosynthesis process. The oxygen gas that is present in the bell jar has already been consumed by the mouse and the burning candle. So due to lack of oxygen, the mouse **** and also the candle got extinguished.
(iv) The significance of photosynthesis process is that it is the only biological process which releases oxygen into the atmosphere that supports all life forms on the earth'* surface.
