A) vessel and sieve tube only
B) tracheids, vessels and sieve tube
C) vessel, sieve cells and sieve tube
D) tracheids, vessel and sieve cells
Correct Answer: B
Solution :Tracheids are elongated or tube like cells with thick and lignified walls and tapering ends. These are dead and are without protoplasm. Vessel is a long cylindrical tube-like structure made up of many cells called vessel members, each with lignified walls and a large central cavity. Sieve tube elements are also long, tube-like structures, arranged longitudinally and are associated with the companion cells. Their end walls are perforated in a sieve-like manner to form the sieve plates.
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