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Question:

Which of the following statement is true?

Vessels are multicellular and with wide lumen

Tracheids are multicellular and with narrow lumen

Vessels are unicellular and with narrow lumen

Tracheids are unicellular and with wide lumen

Solution:

Tracheids are unicellular whereas vessels are multicellular. Tracheids are more lignified, so have narrow lumen whereas vessels have less lignified, so have wide lumen. So, the correct answer is 'Vessels are multicellular and with wide lumen'