Explain the development of female gametophyte. Illustrate the answer with suitable diagrams.

Solution

Development of female gametophyte

1. The functional megaspore undergoes a mitotic division forming the 2-nucleate embryo sac.

2. Two successive mitotic divisions in each of these two nuclei result in the formation of an 8-nucleate embryo sac.

3. Cell wall formation starts at the eight-nucleate stage, resulting in the formation of a typical female gametophyte.

4. Three cells that is 2 synergids and 1 egg cell are grouped together at the micropylar end to form the egg apparatusl.

5. Three cells are grouped together at the chalazal end; and are called antipodal cells. The remaining two move to the centre and are called polar nuclei.

6.Thus, a typical angiosperm embryo sac is 8-nucleate and 7-celled.

Fig. Development of embryosac.

Some More Questions From Sexual Reproduction in flowering Plants Chapter

In ................... flowers, the thalamus grows upwards completely enclosing the ovary, and the stamens, petals and sepals are borne above the ovary.

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Sexual Reproduction In Flowering Plants

Explain the development of female gametophyte. Illustrate the answer with suitable diagrams.

Some More Questions From Sexual Reproduction in flowering Plants Chapter

In a bisexual flower when the gynaecium matures earlier than anther, it is called as :

Simultaneous meiotic division of microspore mother cells leads to :

The fertilization occurs in the :

The female gametophyte of a typical dicot at the time of fertilization is:

Development of embryo from any cell of nucellus is called :

Parthenocarpic fruit is :

The entry of pollen tube into embryo sac through the integuments is termed as :

512 microspores will be formed following meiosis of how many microspore mother cells.

Pollination by water occurs in :

In ................... flowers, the thalamus grows upwards completely enclosing the ovary, and the stamens, petals and sepals are borne above the ovary.

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