Q. Arrange the following plants in ascending order based on the number of xylem strands in their roots. I. Trapa II. Pisum III. Castanea IV. Nicotiana
A) II, IV, III, and I
B) III, IV, II, and I
C) IV, III, I, and II
D) I, IV, II and III
Explanation
Only one xylem strand occurs in the slender root of the hydrophyte Trapa natans. In Nicotiana, the roots are diarch. In Pisum, the root is triarch. In Castanea, the root is tetrarch.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.