AP BIOLOGY

Detailed explanation-1: -Stomata present in the lower surface are not in direct contact with sunlight, so it opens less, and the rate of transpiration is reduced which prevents the water loss. Thus, a large amount of stomata is present at the lower surface of the dicot leaves.

Detailed explanation-2: -In most cases, the lower epidermis contains more stomata than the upper epidermis because the bottom of the leaf is cooler and less prone to water loss.

Detailed explanation-3: -The number of stomata is much more on the lower surface of the leaves and less on the upper surface, therefore, the rate of transpiration is low on the upper surface and high on the lower surface. The rate of transpiration is the rate at which water evaporates from the leaves of plants.

Detailed explanation-4: -If more stomatal pores are present on the upper side, due to high rate of evaporation from the upper epidermal layer, the water present in the plant gets evaporated and the amount of water in plants get reduced. So in order to prevent this, more stomata are present in the lower epidermis than in the upper epidermis. Q.

Detailed explanation-5: -This is because if the number of stomata is more on the upper surface then it will be more in contact with the sunlight which will thus result in more transpiration and hence more amount of water loss will take place.