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प्रश्न
Explain the mechanism of closing and opening of the stomata.
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उत्तर
The closing and opening of the stomata depends on the turgidity of the guard cells. Each guard
cell has a thicker wall on the side facing the stoma and a thin wall on the opposite side. Guard cells contain chloroplasts. As a result of the synthesis of glucose during photosynthesis and some other chemical changes, the osmotic pressure of the contents of the guard cells increases and they absorb more water from the neighbouring cells, thus becoming turgid. Due to turgor, the guard cells become more arched outwards and the aperture between them widens, thereby opening the stoma.
At night or when there is shortage of water in the leaf, the guard cells turn flaccid and their inner rigid walls become straight, thus closing the stomatal aperture.
संबंधित प्रश्न
Correct the following statements by changing the underlined words:
Xylem transports starch from the leaves to all parts of the plant body
Give reason for the following:
If you uproot a plant from the soil, its leaves soon wilt.
What part is played by The cytoplasm in the uptake of water into the root hair?
Name the following:
Tissue concerned with upward conduction of water.
Choose the correct answer:
The water is translocated upwards from the roots through _____________
What is toxicity ?
Identify the part of the plants which is responsible for maximum absorption of water.
Aquatic animals like fish excrete their wastes in gaseous form as ______.
