Sexual Reproduction in Flowering Plants

Sexual reproduction in
Flowering plants


Contents
I. Flowers
II. Pre fertilisation
III. Double fertilisation
IV. Post fertilisation
V. Apomixes and Polyembryony

, Flowers
Flowers are the reproductive structure in flowering plants
 Male parts of the flower
 Known as stamens
 Comprise of anther and filament
 Female parts of the flower
 Known as pistil
 Comprise of stigma, style and ovary




Pre Fertilisation: Structures and Events
 Androecium (Male reproductive structures)
 The proximal end of the filament is attached to the
thalamus of the flower.
 In angiosperms, the anther is bilobed, with each lobe
having two theca. Therefore they are dithecous.
 The anther is a four sided structure consisting of
four microsporangia, two in each lobe
 The microsporangia develops further and become
pollen sacs
 A microsporangia is surrounded by four wall
layers- the epidermis, endothecium, middle layers
and tapetum.
 The outer three layers perform the function of
protection and help in dehiscence of the anther,