In which of the following is light energy stored in the form of chemical energy?

What is the effect of high $CO_{2}$ concentration and higher values of $ATP/ADP$ ratio?

If the photosynthetic yield in blue wavelength is $10$ units and that in red wavelength is $40$ units, what should be the yield of photosynthesis in a combination of the two wavelengths, if the effect is synergistic (in $units$)?

Plants are known as purifiers of air due to the process of:

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

$I.$ In $C_{3}$-plants,the Calvin pathway takes place in mesophyll cells.
$II.$ In $C_{4}$-plants,the Calvin pathway takes place in the mesophyll cells.
Which of the following statements is true?