A) Vessels are multicellular and with wide lumen
B) Tracheids are multicellular and with narrow lumen
C) Vessels are unicellular and with narrow lumen
D) Tracheids are unicellular and with wide lumen
Correct Answer: A
Solution :
Vessels on trachea are multicellular, made up of a row of cells (called vessel elements), placed one above the other, with their intervening walls absent or variously pored. The length of the trachea rarely exceeds 10 cm, though they may attain a length of two metres as in Quercus and 3-6 metres as in Wistaria and Eucalyptus. The wall of vessels are lignified and hard, but not very thick. The cell cavity or lumen is wide. The thickenings maybe annular, spiral, scalarifonn, reticulate and pitted.
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