Question

In angiosperms, all the four microspore of tetrad are formed from PMC by:

• A. Gametic meiosis
• B. Sporic meiosis
• C. Zygotic meiosis
• D. Mitosis

Answer 1

The correct option is B Sporic meiosis

Sporic meiosis generally occurs in plants at the time of sporogenesis. Haploid spores produce a new gametophytic phase in the life cycle. Example - formation of four microspore of tetrad from PMC in angiosperm.

Zygotic meiosis occurs in some lower plants having haplontic life cycle, e.g., Chlamydomonas, Volvox etc. Meiosis takes place in the zygote, so that the resulting organisms are haploid.

Gametic meiosis occurs in most animals at the time of gametogenesis. Later on, the two haploid gametes fuse forming a diploid zygote and then a diploid organism.