MCQ
Which of the following statements is true?
- ✓Vessels are multicellular with narrow lumen.
- BTracheids are multicellular with narrow lumen.
- CVessels are unicellular with wide lumen.
- DTracheids are unicellular with wide lumen.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$I.$ Double layered
$II.$ Fluid contained in it reduces the friction on the lung surface
$III.$ Its outer layer is in contact with thoracic wall
$IV.$ Its inner layer is in contact with lungs
$R -$ Plasma membrane of a cell is selectively permeable.