Identify A to F in the diagram given below.

A–Filiform apparatus, B–Synergid, C–Egg, D–Central cell, E–Polar nuclei, F–Antipodals

The correct answer is Option (1) -A–Filiform apparatus, B–Synergid, C–Egg, D–Central cell, E–Polar nuclei, F–Antipodals

The embryo sac in angiosperms has a specific distribution of cells. It consists of a total of eight nuclei, six of which are surrounded by cell walls and organized into cells. The remaining two nuclei, known as polar nuclei, are located in the large central cell below the egg apparatus.

• The cells within the embryo sac are arranged in a characteristic pattern. At the micropylar end, three cells form the egg apparatus. The egg apparatus is composed of two synergids and one egg cell. The synergids have specialized cellular thickenings called filiform apparatus at their micropylar tip, which play a crucial role in guiding pollen tubes to the synergid cells. At the chalazal end, three cells are present and are referred to as antipodals. The large central cell contains two polar nuclei.

• Synergid cells: There are two synergid cells, which are located on either side of the egg cell. They have elongated filiform apparatus that help in guiding the pollen tube towards the egg cell.

• Egg cell: There is one egg cell, which is the female gamete. It is located at the micropylar end of the embryo sac.
• Central cell: The central cell contains two polar nuclei. These nuclei fuse to form the secondary nucleus.
• Antipodal cells: There are three antipodal cells, which are located at the chalazal end of the embryo sac. They degenerate after fertilization.
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