During $24$ hours,there is a specific time when plants neither release $O_2$ nor $CO_2$. This is the time of:

Identify the incorrect sentences:
$(I)$ Humidity in the atmosphere is relatively higher in areas where light becomes a limiting factor for plants.
$(II)$ An increase in light intensity beyond a certain point causes the breakdown of chlorophyll,leading to a decrease in the rate of photosynthesis.
$(III)$ $C_4$ plants respond to higher temperatures and show higher rates of photosynthesis,while $C_3$ plants have a much lower temperature optimum.

Water stress causes the stomata to $A$ hence reducing the $B$ availability. Here $A$ and $B$ refer to:

Look at leaves of the same plant on the shady side and compare them with the leaves on the sunny side. Or,compare the potted plants kept in the sunlight with those in the shade. Which of them has leaves that are darker green? Why?

The Law of Limiting Factors for photosynthesis was proposed by ........

Which of the following factors affecting photosynthesis does not have a direct effect on the process?
$I$. Light
$II$. Water
$III$. Temperature
$IV$. Carbon Dioxide
Select the correct option.