The correct answer is option 'B' - Abaxial.

The epidermis is the outermost layer of the leaf and it is composed of two layers - adaxial (upper) and abaxial (lower). These layers have different characteristics and functions.

The stomata are small openings or pores found on the surface of leaves and stems. They are mainly responsible for the exchange of gases, such as carbon dioxide and oxygen, and the regulation of water loss through transpiration. The distribution and density of stomata on the leaf surface can vary depending on various factors such as environmental conditions, species, and leaf age.

The abaxial surface of the leaf, which is the lower surface, typically contains more stomata compared to the adaxial surface. This is because the abaxial surface is generally more exposed to environmental conditions such as light intensity, temperature, and humidity. The increased number of stomata on the abaxial surface allows for a greater surface area available for gas exchange and transpiration.

The adaxial surface, on the other hand, is usually protected from direct exposure to the external environment. It is often covered by a waxy cuticle, which helps reduce water loss and protects the leaf from excessive sunlight. The lower density of stomata on the adaxial surface is an adaptation to minimize water loss and prevent damage from excessive light.

In addition to the adaxial and abaxial surfaces, some leaves also have stomata on their lateral surfaces. These lateral stomata are usually present in leaves with rolled or folded margins. They provide an additional surface area for gas exchange and transpiration.

In conclusion, the abaxial surface of the leaf contains more stomata compared to the adaxial surface. This distribution of stomata helps optimize gas exchange and regulate water loss in response to environmental conditions.

Abaxial refer NCERT