The concentration of $CO_2$ in the atmosphere is $...............$ and if the concentration of $CO_2$ is increased up to $\ldots \ldots \ldots$,it can lead to an increase in the rate of $CO_2$ fixation.

If a plant is provided with optimal temperature,light,and $CO_2$ for photosynthesis,but water is supplied in limited amounts,the rate of photosynthesis will follow which of the following factors?

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.

Which of the following is an effect of herbicides?

Photosynthesis is maximum during:

If a chemical process is affected by more than one factor,then its rate will be determined by: