Stomata remain open during day. Stomata help in e
Question:

Stomata remain open during day. Stomata help in exchange of gases.

Updated On: Jul 5, 2022
  • If both Assertion and Reason are true and Reason is the correct explantion of Assertion
  • If both Assertion and Reason are true and Reason is not the correct explanation of Assertion
  • If Assertion is true but Reason is false
  • If Assertion is false but Reason is true
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The Correct Option is B

Solution and Explanation

The opening and closing of stomata is a function of turgor changes in guard cells. In light malic acid is produced in guard cells which dissociates into hydrogen and malate ions, resulting in intake of K ions through H -K ion exchange. There is increase in concentration of K and malate ions in guard cells, endosmosis of water into guard cells occurs resulting in increased turgor pressure which results in stomatal opening. Stomata are chiefly concerned with gaseous exchange during photosynthesis and respiration and water loss through transpiration.
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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.