Question:
Which of the following helps in maintenance of the pressure gradient in sieve tubes?
Which of the following helps in maintenance of the pressure gradient in sieve tubes?
Updated On: Dec 9, 2024
- Albuminous cells
- Sieve cells
- Phloem parenchyma
- Companion cells
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The Correct Option is D
Solution and Explanation
Companion cells help maintain the pressure gradient in sieve tubes by actively loading sugars into the sieve tubes. This creates a higher solute concentration and thus a higher osmotic pressure in the sieve tubes, resulting in the movement of water into them and thus maintaining the pressure gradient for phloem transport.
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