Question

Which of the following statements support(s) the fact that the upper surface of a leaf is usually greener than the lower surface?

i. More chlorophyll is present on the upper surface to absorb more light.
ii. There are more stomata present on the upper surface than the lower surface.
iii. More sugar is formed on the lower surface.
iv. The green leaves look greener under the hot Sun.

Answer 1

• Chlorophyll is a pigment which gives green colour to leaves of plants and absorbs sunlight for photosynthesis.
• Therefore, only statement (i) is the plausible reason for the upper surface of a leaf being greener than lower surface.
• Stomata helps in gaseous exchange while formation of food does not attribute to the green colour of leaves.