Question

In the diagram of T.S. monocot leaf, identify labellings a, b, c, d with their functions.

a-Motor action , b-Photosynthesis , c- Conduction , d-Transpiration
a-Motor action , b-Conduction , c-Photosynthesis , d-Transpiration
a-Transpiration , b-Photosynthesis , c-Conduction , d-Transpiration
a-Transpiration , b-Conduction , c-Photosynthesis, d-Motor action

Answer 1

Hint: Monocot leaves are the leaves that appear on plants made from single-cotyledon seeds such as maize, rice, grass, wheat, etc. Monocot leaves are said to be isobilateral leaves, as both leaves have the same coloration on the surface. As with parallel ventilation, the leaves are normally ribboned.

Complete answer:
There is an upper and lower surface on the leaves of flowering plants, with the upper surface usually facing away from the ground and the lower surface facing it.
Monocot and dicot leaves each have an outer, waxy layer called the cuticle that protects the upper and lower epidermis dermal tissue. The cuticle covers and allows the leaf to hold water. The leaf is also covered by the epidermis, which is situated under the cuticle.

In gas exchange, it also plays a key role, since it includes pores called stomata. Stomata are also present to some degree in the stem and flowers of the plant, but they are mainly a characteristic of the leaves.

The region between the leaf's upper and lower epidermis is filled by a form of ground tissue called mesophyll. There are several chloroplasts in the mesophyll cells, organelles that conduct photosynthesis, converting light, water, and carbon dioxide into sugar that can be broken down by the plant to produce energy. The primary by-product of photosynthesis is oxygen, which is excellent for species such as humans that use oxygen to breathe.

In leaves, all vascular tissue types have a significant role to play. The xylem takes up water from the roots and dissolved minerals, and when doing photosynthesis, the cells in the mesophyll use the water. Via transpiration, the release of water vapour through the stomata, excess water is expelled. The phloem takes the photosynthesis-generated dissolved sugars to the stem and roots of the plant to be used or deposited.

In the diagram a – represents – trichomes – motor action, b-represents mesophyll - photosynthesis and c-xylem – conduction, d-represents stomata – transpiration.

Hence, the correct answer is option (A)

Note: On the upper and lower sides of the leaf, monocot leaves have stomata, and their veins run parallel to one another. There are also bulliform cells in monocot leaves. It is assumed that these huge, bubble-like cells located just beneath the epidermis, help the leaf bend or fold.