Quick Answer: What Happens To The Antipodal Cells In An Ovule After Fertilization?

What happens to Nucellus after fertilization?

Abstract.

The nucellus is a maternal tissue that embeds and feeds the developing embryo and secondary endosperm.

During seed development, the cells of the nucellus suffer a degenerative process soon after fertilization as the cellular endosperm expands and accumulates reserves..

What is the function of stigma in fertilization?

The stigma receives pollen and it is on the stigma that the pollen grain germinates. Often sticky, the stigma is adapted in various ways to catch and trap pollen with various hairs, flaps, or sculpturings.

What is the role of stigma in the process of fertilization?

Stigma is the receptacle on which the pollen lands and germinates, produces a pollen tube that grows through the style towards the ovule/egg to effect fertilisation and seed set.

Which cell degenerates after Fertilisation in an embryo sac?

1 Answer. (b) In an embryo sac, synergids and antipodals degenerate after fertilisation.

What is the function of the Nucellus?

The nucellus is the largest part of the ovule. It houses the embryo sac as well as nutritive tissue and actually remains present in some flowering plants after fertilization as a source of nutrients for the embyo.

What is the ploidy level of antipodal cells?

DNA content in differentiated antipodal cells has been determined by a cytophotometric analysis; in the case of a mature embryo sac, the ploidy of antipodal cells varied from 8 to 32C.

Is a egg cell haploid or diploid?

Sexually reproducing organisms are diploid (having two sets of chromosomes, one from each parent). In humans, only their egg and sperm cells are haploid.

How is Nucellus formed?

Nucellus, megaspore and perisperm The nucellus (plural: nucelli) is part of the inner structure of the ovule, forming a layer of diploid (sporophytic) cells immediately inside the integuments. … In immature ovules, the nucellus contains a megasporocyte (megaspore mother cell), which undergoes sporogenesis via meiosis.

What are the function of Synergids?

Synergid cells are two specialized cells that lie adjacent to the egg cell in the female gametophyte of angiosperms and play an essential role in pollen tube guidance and function.

What is a Nucellus?

noun plural -li (-laɪ) the central part of a plant ovule containing the embryo sac.

Is antipodal haploid or diploid?

Three haploid antipodal cells (1) occur at the upper end of the emryo sac. A large endosperm mother cell containing two haploid polar nuclei (2) occupies the central portion of the embryo sac. At the lower end (nearest the micropyle and funiculus) are two haploid synergid cells (3) and one haploid egg.

What is the function of Synergids during fertilization?

The synergid cells direct pollen tube growth toward the female gametophyte, and facilitate the entrance of the tube into the embryo sac. Once the pollen tube enters the synergid cell, its growth is arrested, the tip of the tube breaks, and two sperm cells are released.

Are Synergids haploid?

The megagametophyte, which is usually haploid, originates from the (usually diploid) megaspore mother cell, also called the megasporocyte. … The lower end of the embryo sac consists of the haploid egg cell positioned in the middle of two other haploid cells, called synergids.

What is the main function of ovule?

The ovule is the organ that forms the seeds of flowering plants. It is borne in the ovary of the flower and consists of nucellus protected by integuments, precursors of embryo/endosperm, and seed coat, respectively.

What is the meaning of antipodal?

adjective. Geography. on the opposite side of the globe; pertaining to the antipodes. diametrically opposite: twin brothers with antipodal personalities. … (in a developing ovule) of or at the end opposite to the micropyle: antipodal nuclei.

How many antipodal cells are there?

threeantipodal cells The three haploid cells in the mature embryo sac of flowering plants that are situated at the opposite end to the micropyle.

What is the function of Antipodals?

Antipodals are nutritive in function; it nourishes the embryo sac. Substances produced by the antipodals helps in the growth and development of the endosperm. It contains large amount of starch, lipids and proteins which are used up by the developing embryo and the endosperm.

What is the function of Synergids and antipodal cells?

Synergids are one of two small cells lying near the egg in the mature embryo sac of a flowering plant. They help in fertilisation. The two Synergid cells function as the producing center of the signals which guide the pollen tube. The three antipodal cells are the nutritional center.