BPSC (Bihar) Exam > BPSC (Bihar) Questions > The stomata open or close due to change in th...
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The stomata open or close due to change in the
- a)position of nucleus in cells
- b)protein composition of cells
- c)amount of water in cells
- d)More than one of the above
- e)None of the above
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
The stomata open or close due to change in thea)position of nucleus in...
The correct answer is -amount of water in cells.
Key Points
Key Points
- Stomata opening and closure is a process that regulates gas exchange and water balance in plants.
- The process is controlled by two main cells called the guard cells.
- Guard cells are located around the stomatal pore and are responsible for opening and closing the pore.
- The water uptake controls the opening of the stomata by the guard cells
- It leads to turgor pressure and an increase in the size of the guard cells.
- This causes the stomata to open and allow the exchange of gases
- Gases such as carbon dioxide and oxygen are exchanged between the plant and the atmosphere.
- The stomata's closure results from water loss from the guard cells and a decrease in turgor pressure.
- This causes the guard cells to shrink, resulting in the stomata closing
- Nucleus position and protein composition do not have any major effect on the stomata closure and opening.
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Community Answer
The stomata open or close due to change in thea)position of nucleus in...
Stomata and Their Function
Stomata are tiny openings on the surfaces of leaves and stems that play a crucial role in gas exchange and transpiration in plants. The opening and closing of these stomata are primarily influenced by the water content within the guard cells surrounding each stoma.
Mechanism of Stomatal Movement
- Guard Cells: Stomata consist of two specialized cells called guard cells. Their primary function is to regulate the size of the stomatal pore.
- Water Absorption: When the plant has adequate water, the guard cells absorb water through osmosis, leading to turgidity.
- Stomatal Opening: As guard cells become turgid, they swell and curve apart, causing the stomata to open. This allows carbon dioxide to enter for photosynthesis and facilitates water vapor release.
Stomatal Closure
- Water Deficiency: Conversely, when water is scarce, guard cells lose water and become flaccid.
- Stomatal Closing: The loss of turgor pressure causes the guard cells to collapse inward, closing the stomata. This mechanism helps to conserve water and prevent dehydration of the plant.
Conclusion
The correct answer to the question is option 'C', as the opening and closing of stomata are directly linked to the amount of water in the guard cells. Other factors, such as the position of the nucleus or protein composition, do not play a primary role in this physiological process. Understanding this mechanism is essential in the study of plant biology and their adaptations to environmental conditions.
Stomata are tiny openings on the surfaces of leaves and stems that play a crucial role in gas exchange and transpiration in plants. The opening and closing of these stomata are primarily influenced by the water content within the guard cells surrounding each stoma.
Mechanism of Stomatal Movement
- Guard Cells: Stomata consist of two specialized cells called guard cells. Their primary function is to regulate the size of the stomatal pore.
- Water Absorption: When the plant has adequate water, the guard cells absorb water through osmosis, leading to turgidity.
- Stomatal Opening: As guard cells become turgid, they swell and curve apart, causing the stomata to open. This allows carbon dioxide to enter for photosynthesis and facilitates water vapor release.
Stomatal Closure
- Water Deficiency: Conversely, when water is scarce, guard cells lose water and become flaccid.
- Stomatal Closing: The loss of turgor pressure causes the guard cells to collapse inward, closing the stomata. This mechanism helps to conserve water and prevent dehydration of the plant.
Conclusion
The correct answer to the question is option 'C', as the opening and closing of stomata are directly linked to the amount of water in the guard cells. Other factors, such as the position of the nucleus or protein composition, do not play a primary role in this physiological process. Understanding this mechanism is essential in the study of plant biology and their adaptations to environmental conditions.
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The stomata open or close due to change in thea)position of nucleus in cellsb)protein composition of cellsc)amount of water in cellsd)More than one of the abovee)None of the aboveCorrect answer is option 'C'. Can you explain this answer?
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