In plants,food is stored as ........ .

Blackman demonstrated that increasing illumination increased the photosynthetic rate up to a point when $CO_2$ becomes limiting. If light was not limiting,temperature becomes limiting. Emerson found that maximum $CO_2$ fixation could be achieved with brief flashes of light. Mark the correct statement in the following:

How many molecules of water are needed by a green plant to produce one molecule of hexose or to reduce $6$ molecules of $CO_2$?

According to an estimate,how much carbon is fixed annually in the biosphere through photosynthesis?

Explain the information about the discovery of $C_3$ and $C_4$ pathways.

Diffusion, a process that occurs along the concentration gradient, is actively involved in: