A) sieve tube
B) medullary ray
C) sclereid
D) tracheid
Correct Answer: D
Solution :
Xylem is a complex permanent tissue mainly performing the function of conduction of water and solutes from the roots upto the top of the plant. Xylem consists of four types of elements-tracheids, vessels, xylem fibres and xylem parenchyma. Out of these four, the main component of xylem is tracheids. The cells are long, tubular with tapering, chisel like ends and are dead. The cell wall is lignified. A wide space always present. The main function of tracheids is to conduct water but due to their thick and hard walls they also provide mechanical support.
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