Solarisation is

The concentration of $CO_{2}$ in the atmosphere is between

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

Which factor is not limiting under normal conditions for photosynthesis?

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.

If the concentration of $CO_2$ in the atmosphere is as high as $400 \ ppm$,then......