Question:
The given diagrams show stomatal apparatus in dicots and monocots. Which one is correct option for A, B and C?
The given diagrams show stomatal apparatus in dicots and monocots. Which one is correct option for A, B and C?
Updated On: Aug 15, 2022
- A - Epidermal cells; B - Subsidiary cells; C - chloroplast
- A - Guard cells; B - Subsidiary cells; C - Stomatal pore
- A - Guard cells; B - Epidermal cells; C - Guard cells
- A - Epidermal cells; B - Subsidiary cells; C - Guard cells
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The Correct Option is D
Solution and Explanation
Stomata are tiny pores, and composed of two bean shaped epidermal cells called guard cells which enclose stomatal pore. Stomata are mostly present in epidermal layers of leaves and in other aerial parts like young stems, floral parts etc. Guard cells in dicots are kidney shaped and in monocots are dumb bell shaped. The guard cells may be surrounded by varying number of specialized epidermal cells called subsidiary cells or accessory 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.