Question:
Stomatal opening or closing is due to
Stomatal opening or closing is due to
Updated On: Jun 14, 2022
- change in the turgidity of guard cells
- the inner walls of each guard cells is thick and elastic
- cellulose microfibrils of guard cells are oriented radially
- All of the above
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The Correct Option is D
Solution and Explanation
Stomata are minute specialised pores generally present on leaf epidermis. Each stoma is bordered by two specialised epidermal cells called guard cells. Stomata normally open when the light strikes the leaf and close during night. When the light strikes the leaf causes a change in the turgor of the guard cells. The inner wall of each guard-cell flanking each stoma is thick and elastic. Due to turgor pressure, the thin outer walls buldge out and force the inner walls to attain crescent shape. This mediates opening of stomata. When the guard cells lose turgor, the elastic inner wall helps to regain their original shape and the stoma closes.
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Concepts Used:
Transpiration
The process by which the plant body releases water in the form of vapors through its aerial portions is known as transpiration. The evaporation of water from the plant portion is also known as transpiration. It is a crucial function in plants that aids other processes and maintains water and nutrient balance. It provides a number of benefits for the plant's body.
Types of Transpiration:
There are three different types of transpiration in plants:
- Stomatal Transpiration: It is the evaporation of water from a plant's stomata. The majority of the water from the plants is lost through transpiration. When the stomata open, the water at the surface of the leaves turns into vapor and evaporates.
- Lenticular Transpiration: Lenticels are tiny openings in the bark of branches and twigs that allow light to pass through. Lenticular transpiration is the process of water evaporating from a plant's lenticels. Lenticels aren't found in every plant. Through lenticels, only a small amount of water is lost.
- Cuticular Transpiration: It is the evaporation of water from a plant's cuticle. The cuticle is a waxy layer that covers the surface of the plant's leaves. Cuticular transpiration loses about 5-10 percent of the water from the leaves. More water is transpired via the cuticles during dry conditions when the stomata are closed.