Draw a neatly labelled diagram to explain plant fertilisation. Write a few points on pollen grain.
A.
Pollen grains:
- Pollen grains develop in anther.
- Anther consists of spore forming tissue. Some of the cells in the spore forming tissue develop as pollen mother cells.
- Each pollen mother cell undergoes meiosis to form four daughter cells which develop into pollen grains.
- Pollen grains are haploid (‘n’) and are otherwise known as microspores or male gametes.
- They contain only one set of chromosomes (‘n’).
- The study of pollen grain is called palynology.
- During pollination pollen grains are dispersed by wind and insects.
- Pollen grains are formed in large numbers. They are light in weight and are easily carried by wind currents.