S. no

Flower

Development

Stage

Bud length

(mm)

Morphological indications

Figure

Number

1.

Small

0.8 - 1.0

Archesporial cell stage, initiation of integuments in ovule primordium (ovi).

Primary parietal cell and sporogenous cells, division of parietal cells and the formation of 1 - 3 layered nucellus cells. Megasporocyte developed.

Figure 3(a) & Figure 3(b)

2.

Medium

2.3 - 3.0

Megasporocyte which slightly surrounded and begins to form a callose layer

Megaspore mother cells divided and fully developed and surrounded by a thickened callose layer.

Figure 3(c) & Figure 3(d)

3.

Big

3.1 - 3.7

Two-nuclei stage of development, one at micropylar and another situated at chalazal end.

At first mitotic division formation of four nuclei stage of embryo sac development

Figure 3(e) & Figure 3(f)

4.

Pre-anthesis

3.8 - 4.4

At second mitotic division eight nuclei formed four at the end of micropylar and four at chalazal.

Early organized embryo sac showing three antipodal cells, one egg apparatus cell with two synergids and two centrally located polar nuclei (seven celled?ight nuclei).

Figure 3(g) & Figure 3(h)