- What is meant by ploidy?
- How many antipodal cells are there?
- Are Synergids haploid?
- What is the ploidy of embryo?
- Is theca and Microsporangia same?
- What is the function of Synergid cells?
- What does the antipodal cells do?
- What is the ploidy of secondary nucleus?
- Is Gametophyte a female?
- Is antipodal haploid or diploid?
- What is the ploidy of ovary?
- Is Microsporangium and anther same?
- Why is 3 Megaspores degenerate?
- What is the ploidy of Tapetum?
- What parts of a flower are haploid?
- What is the meaning of antipodal?
- What is the ploidy of antipodal cells?
- Are Megasporocytes haploid or diploid?
- Can humans be haploid?
- What is the difference between ovule and embryo sac?
What is meant by ploidy?
Listen to pronunciation.
(PLOY-dee) The number of sets of chromosomes in a cell or an organism.
For example, haploid means one set and diploid means two sets..
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.
Are Synergids haploid?
The lower end of the embryo sac consists of the haploid egg cell positioned in the middle of two other haploid cells, called synergids. The synergids function in the attraction and guidance of the pollen tube to the megagametophyte through the micropyle.
What is the ploidy of embryo?
Answer: The ploidy of embryo sac is Haploid. The number of set of chromosomes is called as Ploidy. The embryo sac is female gametophyte. … The embryo sac has three parts called as egg apparatus, secondary nucleus and antipodal. The antipodas consists of three cells which are haploid.
Is theca and Microsporangia same?
The typical anther is bilocular, i.e. it consists of two thecae. Each theca contains two microsporangia, also known as pollen sacs. The microsporangia produce the microspores, which for seed plants are known as pollen grains. If the pollen sacs are not adjacent, or if they open separately, then no thecae are formed.
What is the function of Synergid cells?
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 does the antipodal cells do?
Antipodal cells are rich in DNA, RNA, total proteins and histones. Enhancement of these metabolites and in polytene level of antipodals at the nuclear endosperm stage, and deep staining of cellular endosperm near the degenerat- ing antipodal cells reveal that antipodals help in the nutrition of the endosperm.
What is the ploidy of secondary nucleus?
Secondary (definitive) nucleus is formed by the fusion of two haploid polar nuclei hence it is diploid (2n).
Is Gametophyte a female?
The female gametophyte is also commonly called the embryo sac or megagametophyte. The male gametophyte, also called the pollen grain or microgametophyte, develops within the anther and consists of two sperm cells encased within a vegetative cell (Gifford and Foster, 1989).
Is antipodal haploid or diploid?
haploid (iii) Antipodal? haploid (iv) Zygote? diploid Since, all these cells three cells (synergid, polar nuclei and antipodals are) formed by mitosis from the functional megaspore, they are haploid (n). Egg cell fertilizes with the male gamete to form a diploid zygote.
What is the ploidy of ovary?
(a) Ovary – Diploid, (b) Anther – Diploid, (c) Egg – Haploid, (d) Pollen – Haploid, (e) Male gamete – Haploid, (f) Zygote – Diploid.
Is Microsporangium and anther same?
Yes, microsporangium means anther. It is a four-sided structure and consists of four microsporangia, each located at the corner. It helps in the production of microspores or pollen grains, which are produced in thousands of number.
Why is 3 Megaspores degenerate?
In each megasporangium (the female carrier of spores) a megasporocyte is present which leads to four megaspores after meiosis. three of these megaspores degenerate, only one megaspore is functional and forms the megagametophyte with two or three archegonia containing each one egg cell.
What is the ploidy of Tapetum?
Tapetum is in anther which encourages for the advancement of dust. it is diploid. … Recollect that in plants all cells are diploid aside from dust grains and female gametophyte (incipient organism sac) which are haploid,and after treatment endosperm is shaped which is triploid.
What parts of a flower are haploid?
Ovary, anther, and zygote are diploid as they initial two are places where gametes are formed and the zygote is formed after the fusion of haploid gametes.Pollen and egg are haploids formed after meiosis and are male and female gametophyte.
What is the meaning of antipodal?
1 : of or relating to the antipodes specifically : situated at the opposite side of the earth or moon an antipodal meridian an antipodal continent. 2 : diametrically opposite an antipodal point on a sphere. 3 : entirely opposed a system antipodal to democracy.
What is the ploidy 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.
Are Megasporocytes haploid or diploid?
A megaspore mother cell, or megasporocyte, is a diploid cell in plants in which meiosis will occur, resulting in the production of four haploid megaspores. At least one of the spores develop into haploid female gametophytes (megagametophytes). The megaspore mother cell arises within the megasporangium tissue.
Can humans be haploid?
Haploid describes a cell that contains a single set of chromosomes. The term haploid can also refer to the number of chromosomes in egg or sperm cells, which are also called gametes. In humans, gametes are haploid cells that contain 23 chromosomes, each of which a one of a chromosome pair that exists in diplod cells.
What is the difference between ovule and embryo sac?
The male gametophyte (pollen or microgametophyte) develops within the anther, whereas the female gametophyte (embryo sac or megagametophyte) is a product of the ovule. … The ovule is the source of the megagametophyte and the progenitor of the seed.