How many pollen grains are required to fertilize 10th ovules present in a particular carpel?

10 pollen grains
Even though each pollen grain has two male gametes, atleast 10 pollen grains required to fertilise 10 ovules present in a particular carpel instead of 5 pollen grains because only one male gamete is involved in syngamy or the fusion of male gamete with the egg cell.

Why at least 20 pollen grains are required to fertilize 20 ovules in a particular carpel?

During double fertilization, one of the male gamete of pollen grain fuses with egg cell, while other male gamete fuses with secondary nucleus. Thus to fertilize 20 ovules in a particular carpel, 20 pollen grains are required.

Why does it possess two male gametes to fertilize one ovule?

Pollen sacs contain pollen grains. A pollen grain contains two male gametes. One of the male gametes fuses with female gamete to frame zygote and the other one breakers with the polar cores to shape the essential endosperm core.

How many egg cells will be needed to fertilize 8 pollen grains when each pollen grains produce two male gametes?

The answer is 4. As we know that 1 pollen grain produce 2 male gametes and these 2 male gametes that goes in one ovule to fuse with egg and two polar nuclei. so, for 4 ovules 4 pollen grains will be required.

What is the advantage of pollen grains?

Pollen is a plant’s male DNA that is transported to the female part of the flower to enable the plant to reproduce. Because pollen contains DNA, it can be used to change a plant’s traits. Such changes can increase harvest production or help a plant survive in a specific environment.

Why pollen grains can remain well preserved as fossils?

Complete answer: Pollen grains are made up of three components: It’s a key component of plant spores and pollen grains’ robust outer (exine) walls. It has a chemical stability that allows it to survive in soils and sediments. Because of the presence of sporopollenin, pollen grains are highly preserved as fossils.

How many pollen grains and ovules are likely to be formed in the anther?

100 pollen grains and 25 ovules are likely to be formed in the anther and ovary of an angiosperm bearing 25 microspore mother cell and 25 megaspore mother cells.

What is the fate of two male gametes present in the pollen grain?

In flowering plants, two male gametes from a single pollen grain fuse with two female gametes, the egg and central cells, to form the embryo and endosperm, respectively. The question then arises whether the two male gametes fuse randomly with the egg and central cells.

Why do pollens posses two male gametes?

There are two male gametes in a pollen grain. One of this gamete fuses with egg which forms formed zygote and resulting to the embryo in the later process. The other gamete fuses with central cell(2n) to form “triploid primary endosperm cell(3n)” which will then form as a endosperm to produce food to the embryo.

How many male gametes do pollen grains produce?

Two male gametes
Two male gametes. Two male gametes are produced from a single pollen grain in flowering plants. Pollen grains released from pollen-sacs at the two-celled stage, wherein the generative cell divides further to form two male gametes. They are then released into the embryo sac.

Where does pollen formation occur?

Formation. Pollen is produced in the microsporangia in the male cone of a conifer or other gymnosperm or in the anthers of an angiosperm flower. Pollen grains come in a wide variety of shapes, sizes, and surface markings characteristic of the species (see electron micrograph, right).