The most vital process for the existence of life on Earth is

Give a comparison between the following:
$(a)$ $C_{3}$ and $C_{4}$ pathways
$(b)$ Cyclic and non-cyclic photophosphorylation
$(c)$ Anatomy of leaf in $C_{3}$ and $C_{4}$ plants

Who proposed the theory of photosynthesis in guard cells?

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

Which wavelength of light carries out photosynthesis in bacteria?

In plants,the uptake of $CO_2$ and the release of $O_2$ is a process called .........