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प्रश्न
Guard cells are responsible for the opening and closing of stomata.
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उत्तर
- Opening and closing of stomata take place due to changes in the turgor of the guard cell.
- The turgor changes in the guard cells are due to the entry and exit of water into and out of the guard cells.
- During the day, water from the subsidiary cells enters the guard cells making them fully turgid causing the stomata to open.
- During the nighttime, water from guard cells enters the subsidiary cells, making the guard cells flaccid, causing the stomata to close.
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संबंधित प्रश्न
Briefly explain, how transpiration helps in upward conduction of water in plants?
An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:
Explain the process named above in 7.1.
Design an experiment to demonstrate the transpiration process.
Name the cell that surrounds the stoma.
What type of transpiration is possible in the xerophyte Opuntia?
Boojho wanted to test the presence of starch in leaves. He performed the following steps.
- He took a leaf and boiled it in water.
- He placed the leaf in a petri dish and poured some iodine over it.
He did not get the expected result. Which step did he miss? Explain.
Observe the diagram and answer the following;
 (i) |
 (ii) |
- Are these types of guard cells found in monocots or dicots?
- Which of these shows a higher water content (i) or (ii)?
- Which element plays an important role in the opening and closing of stomata?
Why is transpiration less in the still wind?
Enlist different advantages of transpiration.
Transpiration occurs:
