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Question

Which of the following is enucleate at maturity?


Your Answer
A
Companion cell
Your Answer
B
Meristemic cell
Your Answer
C
Parenchyma cell
Correct Answer
D
Sieve tube cell

Solution

The correct option is D Sieve tube cell
Phloem is composed of - sieve tube elements, companion cells, phloem parenchyma and phloem fibres.
  • Sieve tube elements are long, tube-like structures and are associated with companion cells. Their end walls are perforated to form the sieve plates. A mature sieve element possesses pheripheral cytoplasm and a large vacuole but lacks a nucleus. It becomes enucleate due to the degeneration of its nucleus during its developmental process.
The companion, parenchyma and meristematic cells possesses the nucleus throughout its life. 

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