Are pollination and fertilization necessary in apomixis?
Pollination and fertilisation is not required in apomixis as there is no involvement of male gametes in this process.
Acche Marks
Define parthenocarpy.
Parthenocarpy is the natural or artificially induced development of seedless fruits without fertilization.
Name the layer which supplies nourishment to the developing pollen grains.
The layer that supplies nourishment to the developing pollen grains is called the tapetum.
What is hydrophily?
Hydrophily is the pollination of plants by water. Pollen grains are dispersed and carried by the flow of water to reach compatible female structures for fertilization.
Define megasporogenesis.
Megasporogenesis is a crucial process in the sexual reproduction of flowering plants (angiosperms) and some gymnosperms. It refers to the development of megaspores, which are haploid spores that give rise to the female gametophyte, also known as the embryo sac.
Even though each pollen grain has 2 male gametes, why atleast 20 pollen grains are required to fertilize 20 ovules in a particular carpel?
While each pollen grain has two male gametes, at least 20 are needed for 20 ovules due to double fertilization. One gamete fuses with the egg, and the other with the central cell, requiring a 1:1 ratio of pollen to ovules. This ensures both fertilization and endosperm formation for embryo development.
How many haploid cells are present in a mature embryo sac?
In a mature embryo sac there are 6 haploid cells. These are: 3 antipodal cells 2 synergids 1 egg cell
Name the part of gynoecium that determines the compatible nature of pollen grain
The stigma is the part of the gynoecium that determines the compatible nature of pollen grains.