Question

What is the function of chloroplasts in guard cell of stomata std 10?

Answer 1

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The two main functions of stomata are to allow for the uptake of carbon dioxide and to limit the loss of water due to evaporation. In many plants, stomata remain open during the day and closed at night. Stomata are open during the day because this is when photosynthesis typically occurs. In photosynthesis, plants use carbon dioxide, water, and sunlight to produce glucose, water, and oxygen. Glucose is used as a food source, while oxygen and water vapor escape through open stomata into the surrounding environment. Carbon dioxide needed for photosynthesis is obtained through open plant stomata. At night, when sunlight is no longer available and photosynthesis is not occurring, stomata close. This closure prevents water from escaping through open pores.
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Answer 2

Answer:

On the grana, there are chlorophyll molecules that trap light energy for photosynthesis. The guard cells produce simple sugar during photosynthesis, glucose becomes more osmotically active, water is taken from nearby epidermal cells via osmosis, the guard cells become turgid and protrude outwards, and the stomata open as a result.

Explanation:

• Experimental data support each of the four potential ways that guard cell chloroplasts could influence stomatal function.
• Starch stored in the chloroplasts (produced from carbon assimilated in the guard cell chloroplasts or imported from the mesophyll) is available to synthesize malate as a counter ion to K+ or is broken down into sucrose as a result of electron transport in guard cells, which produces ATP and/or reductants used in osmoregulation;
• Osmotically active sugars are produced by guard cells' photosynthetic carbon absorption.

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