Question

Tracheids are less efficient than vessels due to

• A. Absence of closed end walls.
• B. Uneven thickenings
• C. Casparian strips
• D. Presence of tapering end walls.

Answer 1

The correct option is D Presence of tapering end walls.

Tracheids differ in many ways from vessels:-

• Tracheids have narrow lumen while vessels lumen is wide.
• Tracheids have less number of large pits while vessels have a large number of small pits.
• Tracheids are imperforated while vessels are perforated.
• Tracheids have tapering ends while vessels have diagonal or transverse end walls.
• Tracheids have thin walls while vessels have a thick cell wall.

So the correct option is 'Presence of tapering end walls'.