Pre-fertilization in Plant: Microsporangium

Pre-fertilization in Plant: Microsporangium

1. Microsporangium:

• A microsporangium is a structure found in the anthers of flowering plants that produces and houses microspores, which eventually develop into male gametophytes or pollen grains. 

2. Structure of microspore:

• Pollen grain is a non-motile, haploid, unicellular body with a single nucleus. It is surrounded by a two-layered wall called sporoderm.
• The outer layer, exine, is thick and non-biodegradable, with a smooth or sculptured pattern. It is resistant to chemicals and has germ-pores for pollen tube growth during germination.
• The inner wall layer, intine, is composed of cellulose and pectin. 

3. Microsporogenesis;

• Microsporogenesis is the process by which diploid microspore mother cells within the microsporangium undergo meiosis to form haploid microspores, which then develop into pollen grains.