What do you mean by synergid?
Definition of synergid : one of two small cells lying near the micropyle of the embryo sac of an angiosperm.
What is the role of synergid?
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. The synergids are also essential for the cessation of pollen tube growth and release of the sperm cells.
What is the meaning of Heterofertilization?
Definition of heterofertilization : double fertilization in a seed plant (as maize) that results in phenotypically and probably genotypically different endosperm and embryo heterofertilization is considered to result when the polar nuclei and the egg fuse with male nuclei of differing genetic constitution.
What is the function of Synergids Class 12?
The function of synergids is to basically attract and guide the pollen tube to the megagametophyte.
What do you mean by 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 antipodal cells in plants?
antipodal cells The three haploid cells in the mature embryo sac of flowering plants that are situated at the opposite end to the micropyle. A Dictionary of Biology.
What is the function of Synergids and antipodal cells?
The function of the antipodal cells is to provide nourishment to the egg cell. It is rich in lipid content. They also form the basis of endosperm production. The synergids consists of filiform apparatus which guides the pollen tube and the pollen tube discharges its content into one of the synergids.
What is the purpose of Synergids in an ovule?
Synergids are present at the micropylar end. The egg apparatus contains two synergids and an egg cell. Synergids help in guiding the pollen tube in the ovule with the help of filiform apparatus present at the micropylar tip.
What happens if Polyspermy occurs?
In biology, polyspermy describes an egg that has been fertilized by more than one sperm. The cell resulting from polyspermy, on the other hand, contains three or more copies of each chromosome—one from the egg and one each from multiple sperm. Usually, the result is an unviable zygote.
What is the function of Synergids in ovule?
What does antipodes mean in geography?
Definition of antipode 1 : the parts of the earth diametrically opposite —usually used in plural —often used of Australia and New Zealand as contrasted to the western hemisphere. 2 : the exact opposite or contrary.
What is synergid in biology?
synergid. One of two small, short-lived nuclei lying near the egg in the mature embryo sac of a flowering plant. The synergids are part of the egg apparatus and are thought to help the pollen nucleus reach the egg cell for fertilization. See more at egg apparatus embryo sac.
What is democracy?
Democracy, which derives from the Greek word demos, or people, is defined, basi- cally, as government in which the supreme power is vested in the people. In some forms, democracy can be exercised directly by the people; in large societies, it is by the people through their elected agents.
What is demdemocracy?
Democracy may be a word familiar to most, but it is a concept still misunderstood and misused at a time when dictators, single-party regimes, and military coup leaders alike assert popular support by claiming the mantle of democracy.
What is democracy according to Popper?
Although democracy is generally understood to be defined by voting, no consensus exists on a precise definition of democracy. Karl Popper says that the “classical” view of democracy is simply, “in brief, the theory that democracy is the rule of the people, and that the people have a right to rule.”