Q. First formed primary xylem elements are called ...A… . Later formed primary xylem elements are called …B… . A and B in the above statement refers to
A) A–metaxylem; B–protoxylem
B) A–protoxylem; B–metaxylem
C) A– protophloem; B–metaphloem
D) A–metaphloem; B–protophloem
Explanation
Primary xylem is of two types. First, formed primary xylem is called protoxylem and later formed is called metaxylem. The position of protoxylem and metaxylem is towards pith and periphery, respectively in case of stem and vice versa in roots
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.