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Which of the following facilitates opening ofstomatal aperture ?
- a)Decrease in turgidity of guard cells
- b)Radial orientation of cellulose microfibrils in thecell wall of guard cells
- c)Longitudinal orientation of cellulose microfibrilsin the cell wall of guard cells
- d)Contraction of outer wall of guard cells
Correct answer is option 'B'. Can you explain this answer?
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Opening of Stomatal Aperture
The stomatal aperture refers to the opening and closing of the stomata, which are small pores present on the surface of leaves and stems. The stomata are responsible for regulating the exchange of gases and water vapor between the plant and the environment. The opening and closing of stomata are controlled by the guard cells, which are specialized cells that surround the stomatal pore.
Function of Guard Cells
The guard cells play a crucial role in regulating the opening and closing of stomatal pores. When the guard cells are turgid (full of water), the stomatal pore opens, allowing for the exchange of gases and water vapor. On the other hand, when the guard cells lose water and become flaccid, the stomatal pore closes, preventing the loss of water through transpiration.
Role of Cellulose Microfibrils
Cellulose microfibrils are present in the cell wall of guard cells and play a significant role in the regulation of stomatal aperture. The arrangement and orientation of these microfibrils determine the turgidity of the guard cells and, consequently, the opening or closing of stomatal pores.
Radial Orientation of Cellulose Microfibrils
One of the options provided is the radial orientation of cellulose microfibrils in the cell wall of guard cells. This arrangement refers to the microfibrils being oriented perpendicular to the surface of the guard cells. When the radial orientation of cellulose microfibrils occurs, it facilitates the opening of stomatal apertures. This is because the radial arrangement allows for the expansion of the guard cells when they take up water, leading to an increase in turgidity and the opening of stomatal pores.
Other Options
The other options provided do not facilitate the opening of stomatal apertures:
a) Decrease in turgidity of guard cells: A decrease in turgidity would lead to the closing of stomatal pores, not the opening.
c) Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells: The longitudinal orientation of cellulose microfibrils does not contribute to the opening of stomatal apertures.
d) Contraction of outer wall of guard cells: Contraction of the outer wall of guard cells would result in the closing of stomatal pores, not the opening.
Therefore, the correct answer is option 'B' - radial orientation of cellulose microfibrils in the cell wall of guard cells.
The stomatal aperture refers to the opening and closing of the stomata, which are small pores present on the surface of leaves and stems. The stomata are responsible for regulating the exchange of gases and water vapor between the plant and the environment. The opening and closing of stomata are controlled by the guard cells, which are specialized cells that surround the stomatal pore.
Function of Guard Cells
The guard cells play a crucial role in regulating the opening and closing of stomatal pores. When the guard cells are turgid (full of water), the stomatal pore opens, allowing for the exchange of gases and water vapor. On the other hand, when the guard cells lose water and become flaccid, the stomatal pore closes, preventing the loss of water through transpiration.
Role of Cellulose Microfibrils
Cellulose microfibrils are present in the cell wall of guard cells and play a significant role in the regulation of stomatal aperture. The arrangement and orientation of these microfibrils determine the turgidity of the guard cells and, consequently, the opening or closing of stomatal pores.
Radial Orientation of Cellulose Microfibrils
One of the options provided is the radial orientation of cellulose microfibrils in the cell wall of guard cells. This arrangement refers to the microfibrils being oriented perpendicular to the surface of the guard cells. When the radial orientation of cellulose microfibrils occurs, it facilitates the opening of stomatal apertures. This is because the radial arrangement allows for the expansion of the guard cells when they take up water, leading to an increase in turgidity and the opening of stomatal pores.
Other Options
The other options provided do not facilitate the opening of stomatal apertures:
a) Decrease in turgidity of guard cells: A decrease in turgidity would lead to the closing of stomatal pores, not the opening.
c) Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells: The longitudinal orientation of cellulose microfibrils does not contribute to the opening of stomatal apertures.
d) Contraction of outer wall of guard cells: Contraction of the outer wall of guard cells would result in the closing of stomatal pores, not the opening.
Therefore, the correct answer is option 'B' - radial orientation of cellulose microfibrils in the cell wall of guard cells.
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Which of the following facilitates opening ofstomatal aperture ?a)Decrease in turgidity of guard cellsb)Radial orientation of cellulose microfibrils in thecell wall of guard cellsc)Longitudinal orientation of cellulose microfibrilsin the cell wall of guard cellsd)Contraction of outer wall of guard cellsCorrect answer is option 'B'. Can you explain this answer?
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Which of the following facilitates opening ofstomatal aperture ?a)Decrease in turgidity of guard cellsb)Radial orientation of cellulose microfibrils in thecell wall of guard cellsc)Longitudinal orientation of cellulose microfibrilsin the cell wall of guard cellsd)Contraction of outer wall of guard cellsCorrect answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following facilitates opening ofstomatal aperture ?a)Decrease in turgidity of guard cellsb)Radial orientation of cellulose microfibrils in thecell wall of guard cellsc)Longitudinal orientation of cellulose microfibrilsin the cell wall of guard cellsd)Contraction of outer wall of guard cellsCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following facilitates opening ofstomatal aperture ?a)Decrease in turgidity of guard cellsb)Radial orientation of cellulose microfibrils in thecell wall of guard cellsc)Longitudinal orientation of cellulose microfibrilsin the cell wall of guard cellsd)Contraction of outer wall of guard cellsCorrect answer is option 'B'. Can you explain this answer?.
Which of the following facilitates opening ofstomatal aperture ?a)Decrease in turgidity of guard cellsb)Radial orientation of cellulose microfibrils in thecell wall of guard cellsc)Longitudinal orientation of cellulose microfibrilsin the cell wall of guard cellsd)Contraction of outer wall of guard cellsCorrect answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following facilitates opening ofstomatal aperture ?a)Decrease in turgidity of guard cellsb)Radial orientation of cellulose microfibrils in thecell wall of guard cellsc)Longitudinal orientation of cellulose microfibrilsin the cell wall of guard cellsd)Contraction of outer wall of guard cellsCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following facilitates opening ofstomatal aperture ?a)Decrease in turgidity of guard cellsb)Radial orientation of cellulose microfibrils in thecell wall of guard cellsc)Longitudinal orientation of cellulose microfibrilsin the cell wall of guard cellsd)Contraction of outer wall of guard cellsCorrect answer is option 'B'. Can you explain this answer?.
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