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

Which of the following proteins is the most abundant on Earth?

For photosynthesis (i.e.,for synthesis of organic matter),the green plants need:

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

Give scientific reasons:
$(1)$ The productivity of $C_4$ plants is more than $C_3$ plants.
$(2)$ It is necessary that the Calvin cycle runs for six times.

$A$ student performed an experiment on photosynthesis as follows: They took soda water in a glass tumbler and added chlorophyll to it. They placed the tumbler in sunlight,expecting that they had provided all the necessary components for photosynthesis (i.e.,$CO_2$,$H_2O$,chlorophyll,and light). What do you think will happen after a few hours of exposure to sunlight?