Development Of Ovule #cbse#biology#ncert#neet#class12#shorts#reels#neetaspirant#bio

Development Of Ovule #cbse#biology#ncert#neet#class12#shorts#reels#neetaspirant#bio
Ovule development in flowering plants (angiosperms) begins with a small protrusion (primordium) on the ovary placenta. It develops into a complex structure comprising the nucellus, inner/outer integuments (future seed coat), and a funiculus (attachment stalk). Within the nucellus, a megaspore mother cell undergoes meiosis, leading to the formation of a functional embryo sac (female gametophyte) which produces the egg cell.
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Key stages of ovule development include:
Ovule Primordium Initiation: Protrusions form on the placenta, guided by genes like AINTEGUMENTA (ANT).

Megagametogenesis (Embryo Sac Formation): Three megaspores degenerate, and the remaining one grows into a multi-cellular embryo sac (typically the Polygonum type, with eight nuclei).
Integument Development: Integuments grow from the base (chalaza) around the nucellus, leaving a small opening for pollen entry called the micropyle.
Final Structure: The resulting structure is typically an anatropous (inverted) ovule.

Видео Development Of Ovule #cbse#biology#ncert#neet#class12#shorts#reels#neetaspirant#bio канала NCERT BIOPEDIA