(A) $P-protein$ (Phloem protein) is a characteristic protein found in the sieve elements of the phloem in angiosperms. It is involved in the repair of

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(A) $P-protein$ (Phloem protein) is a characteristic protein found in the sieve elements of the phloem in angiosperms. It is involved in the repair of sieve plate pores and the sealing of damaged sieve tubes to prevent the loss of phloem sap. Therefore,it is a component of the sieve tube.