Name: Types of Cross-Pollination
Uploaded: 2019-07-19
Duration: 4 min 6 s
Description: It can't bee!? Bees and butterflies are common pollinators, but many other types of animals and abiotic factors aid pollination. Explore the world of pollina...

Question

Explain the embryonic development in angiosperm plants. Draw a labelled diagram of the heart-shaped embryo.

Accepted Answer

The development of an embryo in angiosperms involves the following steps:

The embryo develops from the diploid zygote.

The diploid zygote divides and redivides by mitosis to form a group of diploid cells called embryos.

Initially, the zygote undergoes a transverse division to form a two-celled proembryo consisting of an upper central terminal cell and a lower basal cell.

The central terminal cell lies towards the micropylar end, while the basal cell lies towards the centre.

The basal cell undergoes repeated divisions to form a multicellular structure called suspensor.

The suspensor pushes the embryo towards the endosperm and thereby provides nourishment to the developing embryo.

The upper terminal cell divides repeatedly to form the embryo proper.

The fully developed embryo consists of the radicle, plumule and one or two cotyledons.

The embryo having two cotyledons is called a dicot embryo.

The embryo with only cotyledon (scutellum) is called a monocot embryo.

In monocot embryos, the radicle is covered by a protective covering called as coleorhiza and the plumule is covered by coleoptile.

Figure: Embryonic development of angiosperms

Explain the embryonic development in angiosperm plants. Draw a labelled diagram of the heart-shaped embryo.

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