Pollen grains are generally spherical and have diameter of about -

The correct answer is Option (3) → 25-50 micrometers

A pollen grain is the male gametophyte of a flowering plant, formed inside the microsporangium (pollen sac). It is generally spherical, and its diameter is about 25-50 micrometres. It has a hard outer wall called the exine, made of sporopollenin, and a thin inner wall called the intine.

Note: A similar question was also asked in CUET (UG) 2026 on 24-05-2026 (Slot 1).

NCERT Extract:
Stamen, Microsporangium and Pollen Grain – …