The following figures show

Options

A. Microspore
B. Pollen grain
C. Microsporangium
D. Microspore tetrad

Answer

D

Explanation

• The microspores, as they are formed are arranged in a cluster of 4 cells-the microspore tetrad.
• Arrangement of microspores in tetrads is usually tetrahedral (most common type and found in dicots).
• Another type of tetrad called isobilateral type is found in most of the monocots (Zea mays).