Question

Which of the following is true?

• A. Vessels are unicellular and with narrow lumen
• B. Vessels are multicellular and with wide lumen
• C. Tracheids are unicellular and with wide lumen
• D. Tracheids are multicellular and with arrow Lumen

Answer 1

Answer: (B)

Vessels are multicellular and with wide lumen

Answer 2

Vessels are multicellular and with wide lumen.

Vessels or the trachea are multicellular are composed of a type of vessel elements that are lying one above the other. The length of the trachea rarely exceeds 10 cm , though they may be of a length of two metres as in Quercus and 3−6 metres as in Wistaria and Eucalyptus. The wall of vessels is lignified and hard but not thick, having a wide lumen. On the other hand, tracheids are unicellular with a narrow lumen. The cell cavity or lumen is wide. The thickenings may be annular, spiral, scalariform, reticulate, and pitted.

Hence, the correct answer is option B.