Guard cells respond to conditions in the environment toA.regulate stomata to prevent an excessive amount of water loss.B.open stomata in response to sunlight and keep them open all day.C.keep stomata open in windy conditions for optimal uptake of carbon dioxide.D.keep stomata open in hot, dry conditions for optimal photosynthesis.
Question
Guard cells respond to conditions in the environment toA.regulate stomata to prevent an excessive amount of water loss.B.open stomata in response to sunlight and keep them open all day.C.keep stomata open in windy conditions for optimal uptake of carbon dioxide.D.keep stomata open in hot, dry conditions for optimal photosynthesis.
Solution
The correct answer is A. Guard cells respond to conditions in the environment to regulate stomata to prevent an excessive amount of water loss.
Here's a step-by-step explanation:
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Guard cells are specialized cells in the epidermis of leaves, stems and other organs that are used to control water and gas exchange. They are produced in pairs with a gap between them that forms a stomatal pore.
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The primary function of the guard cells is to control the opening and closing of the stomata, which helps regulate the rate of transpiration.
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When the plant has enough water, the guard cells are turgid (swollen with water), causing the stomata to open. This allows for gas exchange necessary for photosynthesis.
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In conditions of water scarcity, the guard cells lose water and become flaccid, leading to the closing of the stomata. This prevents further water loss from the plant through transpiration.
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Therefore, by controlling the opening and closing of the stomata, guard cells help prevent an excessive amount of water loss from the plant, especially in conditions of water scarcity. This is crucial for the survival of the plant.
Similar Questions
What are the functions of stomata and guard cells, and what would happen to a plant if these cells did not function correctly?Group of answer choicesStomata allow gases to enter and exit the plant. Guard cells regulate the opening and closing of stomata. Photosynthesis and, in turn, transpiration, would not occur which is necessary to maintain a continuous flow of water upwards from the roots to the leaves.Guard cells allow carbon dioxide to enter and exit the plant. Stomata regulate the opening and closing of guard cells. Transpiration and in turn, photosynthesis would not occur which is necessary to maintain a continuous flow of water upwards from the roots to the leaves.Stomata allow oxygen to enter and exit the plant. Guard cells regulate the opening and closing of stomata. If the cells didn’t function, photosynthesis would continue but transpiration would cease, which would interfere with the necessary continuous flow of water upward from roots to leaves.Guard cells allow carbon dioxide to enter and exit the plant. Stomata regulate the opening and closing of guard cells. If the cells didn’t function, photosynthesis and transpiration would cease, which would interfere with the necessary continuous flow of water upward from roots to leaves.
What is the use of guard cells?
Stomata remain closed in desert plants during day time. How dothey perform photosynthesis?
What is the function of stomata? Which cells open and close the stomata?
The opening and closing of stomatal pore depend uponOxygen concentration in cellsTemperature of the environmentWater in guard cellsConcentration of CO2 in stomata
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