Monday, 20 July 2020

The Structure of Ovule - Class 12, Chap 2, Lecture 9

Sexual Reproduction In Flowering Plant
The Structure Of Ovule:

The Ovule develops from the base of the ovary. Ovule is also known as megasporangium. First of all undifferentiated, homologous mass of meristematic cell grow at the base of ovary, this is known as Placenta. A stalk like out growth comes out of the Placenta to which the body of Ovule is attached, this structure is known as Funicle or Funiculus or Funiculum. The point of attachment between Funicle and the head of ovule is called as Hilum. At some distance in the lateral side of Funicle the body of ovary is attached with Funicle this is known as Hyphae. The place from where Funicle and the Integuments arise is called Chalaza. The major portion of Ovary is made of parenchymatous cell and act as nutritive layer, this is known as Nucellus. One or two coat around the Nucellus is present and called as Integument. Just opposite to the Chalaza, Integuments are absent and form a narrow passage or pore this is called as Micropyle. Few filaments are attached with funicle or placenta and these filaments guide the growing pollen tube towards the Micropyle is called as Obturators. In the middle of the Ovule a distinct large cell is present, this form the Embryosac.


Objective Type Questions :-

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