Explain the Structure of an Ovule ( Megasporangium).

1.	Explain the Structure of an Ovule ( Megasporangium).
Answer» Structure of an Ovule ( Megasporangium) 1. The ovule is a small structure attached to the placenta by a stalk called funicle. The body of ovule fuses with funicle at Hilium. 2. Each ovule consists of one or two protective envelopes called integuments. Enclosed within the integuments a mass of cells called Nucellus which have abundant reserve food materials and provide nourishment to embryo sac. 3. Inside Nucellus a sac like structure is present which is called embryo sac. 4. The ovule has a minute aperture called micropyle. 5. The basal part of ovule opposite to micropyle is called chalaza. 6. A matured embryosac has * cell, 3 at micropylar end, 2 in the middle and 3 at chalazal end. 7. The middle two cells are called central cells (polar nuclei) 8. The three cells at micropylar end constitute egg apparatus which has two synergids and one egg cell.

Answer»

Structure of an Ovule ( Megasporangium)

1. The ovule is a small structure attached to the placenta by a stalk called funicle. The body of ovule fuses with funicle at Hilium.

2. Each ovule consists of one or two protective envelopes called integuments. Enclosed within the integuments a mass of cells called Nucellus which have abundant reserve food materials and provide nourishment to embryo sac.

3. Inside Nucellus a sac like structure is present which is called embryo sac.

4. The ovule has a minute aperture called micropyle.

5. The basal part of ovule opposite to micropyle is called chalaza.

6. A matured embryosac has * cell, 3 at micropylar end, 2 in the middle and 3 at chalazal end.

7. The middle two cells are called central cells (polar nuclei)

8. The three cells at micropylar end constitute egg apparatus which has two synergids and one egg cell.

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