TREE PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They protect the plant cells.
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They are tiny holes or openings acting as nostrils of the leaves.
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They open and close to enter and exit gases.
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none of the choices
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Detailed explanation-1: -They help to regulate the rate of transpiration by opening and closing the stomata. Light is the main trigger for the opening or closing.
Detailed explanation-2: -Upon the incoming of water inside the guard cells, they swell up to become like a curved banana surface, due to which the stomatal pore opens up. When the guard cells lose water, they become flaccid and straight and thus, close the stomatal aperture. Guard cells and stomata regulates the respiration process in plants.
Detailed explanation-3: -Guard cells are pairs of epidermal cells that control gas diffusion by regulating the opening and closure of stomatal pores.
Detailed explanation-4: -Guard cells are located in the leaf epidermis and pairs of guard cells surround and form stomatal pores, which regulate CO2 influx from the atmosphere into the leaves for photosynthetic carbon fixation. Stomatal guard cells also regulate water loss of plants via transpiration to the atmosphere.
Detailed explanation-5: -Most plants regulate the size of stomata with guard cells. Each stoma is surrounded by a pair of sausage-shaped guard cells. In bright light the guard cells take in water by osmosis and become plump and turgid . In low light the guard cells lose water and become flaccid, causing the stomata to close.