C2 Pre-Fertilisation Events ● Several hormonal and structural changes result in the development of a flower. ● Inflorescences bear the flower buds, and then the flowers. ● Flowers are the reproductive parts of a plant. ● In the flowers, the androecium (male reproductive part) and the gynoecium (female reproductive part) develop. Androecium ● The androecium consists of whorls of stamen. ● The stamen consists of the filament (long and slender stalk) and anther (bilobed structure). ● Filament is attached to the thalamus or to the petal. ● Anther : ○ A typical anther is bilobed and each lobe is dithecous (consists of two theca). ○ Theca are separated by a longitudinal groove running lengthwise. The microsporangia are located at the corners, two in each theca. They further develop to form pollen sacs, which contain the pollen grains. ● Structure of microsporangium ○ The microsporangium is surrounded by four wall layers (epidermis, endothecium, middle layers, and tapet...