Q. Which of the following characteristic does not occur in $Pinus?$
A) The number of needles in a spur of $Pinus\ roxburghii$ is three
B) Each vascular bundle in the long shoot of $Pinus$ consists of xylem facing towards the centre of the shoot
C) Microsporophyll of $Pinus$ bears two microsporangia
D) $Pinus$ is a homosporous gymnosperm
Explanation
$Pinus$ is heterosporous. The sporogenesis results in the formation of micro and megaspores representing the first gametophyte cells.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.