If the rate of translocation of food is slow,what will be the effect on photosynthesis?

Blackman's law is concerned with

With reference to factors affecting the rate of photosynthesis,which of the following statements is not correct?

Which of the following statements is incorrect?

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.

$C_4$ plants show saturation at $.....P.....$ and $C_3$ plants show saturation at $.....Q.....$.