difference between pollen grain and embryo sac

When the embryo sacs have one, two, four, or eight nuclei, the pollen grains have a single and eccentrically located nucleus. ... By the time the embryo sac has proliferated antipodal cells, the pollen grains are two-nucleate. When the embryo sac becomes mature, the pollen grains are in the three-nucleate stage.

1. What is the difference between pollen sac and pollen grain?
2. What is a pollen sac?
3. What happens to male pollen grain in the embryo?
4. What is meant by embryo sac?
5. How does pollen tube enters embryo sac?
6. Is Microsporangium and pollen sac same?
7. Are in the pollen sac?
8. What would happen if a butterfly sips nectar from a flower?
9. How many pollen sacs does anther have?
10. At what part pollen grains are transferred into?
11. At what part the pollen grains are initially located?
12. How is pollen grain formed?

What is the difference between pollen sac and pollen grain?

Pollen grains develop from the diploid microspore mother cells in pollen sacs of anthers. Typically, pollen grain is a haploid, unicellular body with a single nucleus. ... In insect pollinated pollen grains, the exine is covered by a yellowish, viscous and sticky substance called pollen kit.

What is a pollen sac?

: one of the pouches of a seed plant anther in which pollen is formed.

What happens to male pollen grain in the embryo?

Fertilization occurs when pollen grains (male gametophytes) are carried by the wind to the open end of an ovule, which contains the eggs, or female gametophyte. There, the pollen grain develops an outgrowth called a pollen tube, which eventually penetrates to the egg cell within one of the archegonia.

What is meant by embryo sac?

: the female gametophyte of a seed plant consisting of a thin-walled sac within the nucellus that contains the egg nucleus and other nuclei which give rise to endosperm on fertilization.

How does pollen tube enters embryo sac?

The synergids of the embryo sac are considered to produce such chemotropic substances, and to excrete them into the filiform apparatus. ... Invariably, it has been observed that the pollen tube enters the embryo sac at the micropylar side, where it penetrates through the filiform apparatus into one of the synergids.

Is Microsporangium and pollen sac same?

Microsporangia, or pollen sacs, are borne on the lower surfaces of the microsporophylls. The number of microsporangia may vary from two in many conifers to hundreds in some cycads. Within the microsporangia are cells which undergo meiotic division to produce haploid microspores.

Are in the pollen sac?

pollen sac The structure in seed plants in which pollen is produced. In angiosperms there are usually four pollen sacs in each anther; they contain the microspore mother cells. In gymnosperms variable numbers of pollen sacs are borne on the microsporophylls that make up the male cone.

What would happen if a butterfly sips nectar from a flower?

Thin nectar prevents water loss from the butterfly's body and prevents the proboscis from clogging. ... Each time a butterfly sips nectar from a flower, it gets covered in pollen. The pollen transfers from the butterfly to the stigma of the next flower.

How many pollen sacs does anther have?

Complete answer: - Two pollen sacs (theca) are present in each lobe of a typical anther.

At what part pollen grains are transferred into?

Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. The goal of every living organism, including plants, is to create offspring for the next generation.

At what part the pollen grains are initially located?

Pollen grains are produced by meiosis of microspore mother cells that are located along the inner edge of the anther sacs (microsporangia). The outer part of the pollen is the exine, which is composed of a complex polysaccharide, sporopollenin.

How is pollen grain formed?

Pollen is produced within the anthers (microsporangia or pollen sacs) of the flower. During its development from an undifferentiated mound of cells (anther primordium) the anther forms two general groups of cells.