Which of the following is not a feature of sieve tube elements?
(A) Elongated cells
(B) Transverse walls perforated
(C) Has large nucleus
(D) Rounded in cross section
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Answer:
c) has large nucleus answer
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The phloem consists of four elements:- sieve tube elements, companion cells, phloem fibres and phloem parenchyma.
Explanation:
A) This statement is true. The sieve tube elements are long, tube-like cells.
B) This is true. The end wall of the sieve tube is called sieve plates. It consists of numerous sieve pores through which the food material moves from one element to another.
C) This is false. It has peripheral cytoplasm and a large central vacuole but it lacks a nucleus.
D) This is true. The cells of the sieve tube are arranged one above the other in a distinct linear row and appear round in cross-section.
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