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Answer :
The correct option is b) control the passage of carbon dioxide, oxygen, and water vapor.
- Guard cells are specialized cells located in the dermal tissue of a plant, specifically in the epidermis of leaves, stems, and other organs.
- Their primary function is to regulate the opening and closing of stomata, which are small pores on the leaf surface.
- By controlling the size of the stomatal openings, guard cells manage the exchange of gases (carbon dioxide, oxygen) and the release of water vapor through a process called transpiration.
- This regulation is crucial for photosynthesis and maintaining the plant's water balance.
The complete question is shown below,
What do the guard cells in the dermal tissue of a plant do?
a) extend into the soil and increase the surface area of the root.
b) control the passage of carbon dioxide, oxygen, and water vapor.
c) form a hard covering that turns into lignin and wood.
d) allow the plant to move in response to sunlight.
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Rewritten by : Barada
Guard cells in the epidermis of plant leaves control the opening and closing of stomata, facilitating gas exchange necessary for photosynthesis.
Guard cells are specialized cells located in the epidermis of leaves and play a crucial role in the physiology of vascular plants. These cells function in pairs and work to open and close stomata, which are tiny pores on the leaf surface. This process is vital for regulating gas exchange, allowing carbon dioxide to enter for photosynthesis and releasing oxygen and water vapor.
Guard cells change their shape by taking up or losing water, which affects their turgor pressure. When they absorb water, they swell and open the stomata, enabling the plant to transpire and exchange gases. Conversely, when the plant needs to conserve water, guard cells lose water, causing the stomata to close and preventing water loss.
