Question

The egg apparatus of angiosperms comprise
A. An egg cell and two antipodals
B. An egg cell and two synergids
C. An egg cell and two polar nuclei
D. An egg cell and central cell

Answer 1

Hint: Angiosperms are a vascular type of plants. They've got branches, roots and leaves. In comparison to gymnosperms such as conifers and cycads, angiosperm seeds are found in the flower.

Complete Answer:
- Angiosperms are the most evolved and most useful category of plants. They can flourish in a range of habitats, such as trees, vegetables, shrubs and bushes.
- The egg cell or ovum is a haploid female gamete that appears as an egg cell in plants and as an ovum or egg in animals. This results in the development of a zygote after fertilisation, which gives birth to a diploid embryo.
- An egg apparatus is a structure composed of an egg cell and normally two synergistic cells at the micropylar end of the embryo sac in seed plants. Egg apparatus is a collection of three cells in an angiosperm sac comprising seven embryos.
- The micropyle is the opening from which the pollen nucleus reaches the ovule. Synergids are thought to help guide the pollen nucleus to the egg cell as part of the double fertilisation mechanism typical of angiosperms.
- After the egg cell has been fertilised, synergids degenerate. Angiosperm eggs are fertilised and develop into an ovarian seed that is normally found in a flower.

So, the correct option is B, an egg cell and two synergids.

Note: Synergids are two small cells adjacent to the plant ovule that degenerate by the time the pollen tubes enter the ovule. It is assumed that they serve as guides for the development of pollen tubes.