Which of the following are the characteristics of P-proteins?
A
Sieve cell
B
Sieve tubes of monocots
C
Sieve tubes of dicots
D
Both B and C
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Solution
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In the dicots, the sieve tubes are comprised of the protein called as phloem or P protein. This protein is rarely found in the monocot plants. In immature cells, P protein appears to function in sealing off damaged sieve elements by plugging the sieve plate pore. When a sieve tube is cut, the release of pressure causes the content of sieve element to surge towards the cut end from which the plant could lose sugar rich phloem sap if some sealing mechanism is not there.
Thus, the correct answer is option C.
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