Question

Trace the correct sequence of stages in the development of male gametophyte in cycas, starting from microspore.

• A. Generative cell$\to$Body cell$\to$Antheridial cell$\to$Antherozoids
• B. Tube cell$\to$Antheridial cell$\to$Stalk cell$\to$Antherozoids
• C. Antheridial cell$\to$Stalk cell$\to$Tube cell$\to$Generative cell
• D. Antheredial cell$\to$Generative cell$\to$Body cell$\to$Antherozoids

Answer 1

Answer: (D)

Antheredial cell$\to$Generative cell$\to$Body cell$\to$Antherozoids

• The microspore is the first cell or unit of male gametophyte.microspore is a spherical structure that has two walls, an outer thick exine, and inner thin intine.
• The microspore divides to form a small prothallial cell and a bigger antheridial cell.
• The antheridial cell after division produces a smaller generative cell in contact with a prothallial cell and a large tube cell.
• The generative cell divides into a stalk and a body cell which further divides into two multiciliate antherozoids which are the sperms and visible by the naked eye.
  Hence, option D is correct.