Name: The Development of Pollen
Uploaded: 2019-07-19
Duration: 1 min 14 s
Description: Each anther contains four pollen sacs in which the pollen grains are produced. Watch this video to learn how pollen is produced in the pollen sac.

Question

With a suitable diagram explain the structure of an ovule.

Accepted Answer

Structure of Ovule or Megasporangium

1.Ovule is protected by one or two covering called integument.

2. A mature ovule consists of a stalk called funicle at the base and attaches the ovule to the placenta.

3. The point of attachment of funicle to the body of the ovule is known as hilum.

4. In the inverted ovule, the funicle is adnate to the ovule's body, forming a ridge called raphe.

5. The ovule body comprises a central mass of parenchymatous tissue called nucellus, which has extensive reserve food material.

6. The nucellus is enveloped by one or two protective coverings called Integuments.

7. Integuments enclose the nucellus entirely except at the top where it is free and forms a micropyle pore.
8. The basal region of the body of the ovule where the nucellus, the integument and the funicle meet or merge is called chalaza.
9. There is a large, oval, sac-like structure in the nucellus towards the micropylar end called embryo sac or female gametophyte.
10. It develops from the functional megaspore formed within the nucellus.

With a suitable diagram explain the structure of an ovule.

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