A) vascular cambium
B) root hair
C) companion cell
D) members of sieve tube
Correct Answer: D
Solution :
Sieve elements are the conducting elements of the phloem. They may be differentiated into less specialized sieve cells and more specialized sieve tubes. The most important characteristic feature of sieve element protoplast is that it lacks a nucleus when the cell completes its development and becomes functional. Companion cell is a specialized type of parenchyma cell. It is usually small, triangular, rounded or rectangular cell. These cells have abundant granular cytoplasm and a prominent elongated nucleus. Two types of cells are found in cambium the ray initials and fusiform initials. The cambial cells are highly vacuolated, with large nucleus and thin peripheral cytoplasm. Root hair cells also contain nucleus.
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