Question:

Given below is the diagram of a stomatal apparatus. In which of the following all the four parts labelled as A, B, C and D are correctly identified?

Updated On: Jul 12, 2022

A- Epidermal cell, B- Subsidiary cell, C- Guard cell, D- Stomatal aperture
A- Guard cell, B- Stomatal aperture, C- Subsidiary cell, D- Epidermal cell
A- Epidermal cell, B- Guard cell, C- Stomatal aperture, D- Subsidiary cell
A- Subsidiary cell, B- Epidermal cell, C- Guard cell, D- Stomatal aperture

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The Correct Option is A

Solution and Explanation

Transpiration is loss of water in vapour form through the stomatal pores (Label C). The stomatal pore is regulated by guard cells (Label D). The stomatal pore, guard cells and surrounding 3 to 4 thin walled subsidiary cells (Label B), together constitute the stomatal apparatus. The stomatal apparatus is present in the epidermal layer (Label A). The guard cells contain stomata and in this respect are different from the epidermal cells.

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Concepts Used:

Anatomy of Dicotyledonous and Monocotyledonous Plants

Dicot Root:

Dicot plants have the taproot system.
The outermost layer is called the epidermis. The epidermal cells sometimes project out which appear as the root hairs.
The epidermis is followed by the multi-layered cortex, loosely made of the parenchyma cells with intercellular spaces.
The inner layer of the cortex is called endodermis, which is tightly packed by the barrel shaped-cells.
Endodermis is followed by pericycle, which are a few layers of thick-walled parenchyma cells.
In dicots, the central pith is not distinct.
There are two to four xylem and phloem.
The xylem and phloem are remarked by a layer of parenchymatous cells known as conjunctive tissue.

Monocot Root:

Monocot roots do not show much difference in the anatomy from that of the dicot roots.

Monocot plants possess an adventitious root system.
As in the dicots, the epidermis forms the outermost layer, followed by cortex, pericycle, endodermis, vascular bundles (xylem and phloem) and pith (random order).
Pith is conspicuous and large.
The number of xylem in a monocot is six or more.
Secondary growth is not seen in the monocot plants.