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Answer :
Final answer:
Guard cells control the opening and closing of stomata on leaf surfaces, regulating the exchange of carbon dioxide, oxygen, and water vapor. Their ability to change shape through osmosis allows them to respond to environmental conditions, maintaining a balance between efficient photosynthesis and water conservation. This regulation is critical for plant survival and photosynthetic efficiency.
Explanation:
Guard cells are specialized cells in the epidermis of leaves that play a critical role in photosynthesis. They are responsible for controlling the opening and closing of stomata, which are small pores on the leaf surface. Through the opening of stomata, guard cells regulate the exchange of gases, allowing carbon dioxide to enter the leaf for photosynthesis, and releasing oxygen and water vapor.
Guard cells achieve this by changing shape as they either take up or lose water through osmosis, thus opening or closing the stomata. Environmental cues such as light intensity, water availability, and carbon dioxide levels influence the behavior of guard cells. When a plant is experiencing water scarcity, guard cells will close the stomata to conserve water, but this action also impacts photosynthesis by limiting the entry of carbon dioxide.
It is crucial for plants to maintain a balance between efficient photosynthesis, which requires the stomata to be open for gas exchange, and the conservation of water, which may require the stomata to be closed. Therefore, the function of guard cells is vital for the health and survival of plants, as they regulate this delicate balance.
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Rewritten by : Barada
Guard cells surrounding the stomata are helpful in maintaining the water level of plant.
They regulate the water flow by opening and closing the stomata.
So they are not possibly the site for photosynthesis.
The presence of chloroplasts shows the entrapment of solar energy.
