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?

(N/A) Light is a limiting factor for photosynthesis. Leaves receive less light for photosynthesis when they are in the shade.
Therefore,the leaves or plants in the shade perform less photosynthesis compared to those kept in direct sunlight.
To compensate and increase the efficiency of light absorption,the leaves in the shade develop a higher concentration of chlorophyll pigments.
This increased chlorophyll content makes the leaves appear darker green to capture as much available light as possible.
Thus,the leaves or plants in the shade are darker green than those kept in the sun.