Three of the graphs below show the absorption spectra of photosynthetic pigments. One graph shows the action spectrum of photosynthesis for a plant containing the pigments.

All the $\mathrm{x}$ axis show wavelength. Three of the $\mathrm{y}$ axis show light absorption. One $\mathrm{y}$ axis shows the rate of photosynthesis

Reason: In red drop phenomenon the rate of photosynthesis decreases.

Reason : Oxygen inhibitory effect is due to Warburg effect.

Reason : Plants utilizing first $\mathrm{PEP}$ in ${\mathrm{CO}}_2$ fixations are called ${\mathrm{C}}_4$ plants.

Assertion : Plants utilize $5-10\%$ of the absorbed water in photosynthesis.

Reason : Reduced leaf hydration decrease the photosynthesis.