Difference Between Generative Nucleus and Pollen Tube Nucleus

Answer: The tube nucleus guides the pollen tube into the female embryo sac. The generative nuclei are the male gametes that will fuse with the female nuclei in the embryo sac. The pollen tube enters through the micropyle to deposit the sperm cells.

1. What is generative nucleus?
2. What happens to the generative nucleus after pollination?
3. What happens to the generative nucleus?
4. Is generative nucleus haploid or diploid?
5. What is vegetative nucleus?
6. Where is generative nucleus?
7. What happens to generative nucleus during fertilization?
8. When a generative nucleus divides what are the resulting cells called?
9. How many chromosomes should be in an endosperm nucleus?
10. Is pollen a cell?
11. What is the ploidy of generative cell?
12. What is Synergids function?

What is generative nucleus?

: the one of the two nuclei resulting from the first division in the pollen grain of a seed plant that gives rise to sperm nuclei — compare tube nucleus.

What happens to the generative nucleus after pollination?

After the pollen grain germinates into a pollen tube, the generative nucleus divides into two sperm nuclei. ... Eventually it penetrates the micropyle of an ovule and releases its two sperm into the 8-nucleate embryo sac. During double fertilization, one sperm fuses with the egg nucleus to form a zygote.

What happens to the generative nucleus?

The other two, the generative nuclei, can be thought of as nonmotile sperm cells. After reaching an ovule and breaking out of the pollen tube tip, one generative nucleus unites with the egg cell to form a diploid zygote (i.e., a fertilized egg with two complete sets of chromosomes,…

Is generative nucleus haploid or diploid?

one of two HAPLOID nuclei found within the POLLEN GRAINS of flowering plants, which enters the pollen tube when it is produced, divides by MITOSIS, and becomes the male gamete nucleus which fuses with the female egg cell at FERTILIZATION.

What is vegetative nucleus?

(vegetative cell) The large nucleus formed within the pollen grain of angiosperms along with one or two smaller generative nuclei. ... It is thought to control the growth and development of the pollen tube and disintegrates when the pollen tube penetrates the nucellus.

Where is generative nucleus?

The vege- tative nucleus, easily recognizable by its large size, was constantly found in the vicinity of the pore (Fig. 20). The generative nucleus, much smaller, occupied the “tail” of the pollen grain.

What happens to generative nucleus during fertilization?

Explanation: During the process of fertilization, when the pollen tube enters the embryo sac the tube nucleus disintegrate. ... The fate of tube nucleus is that it disintegrates and the generative nucleus forms the ZYGOTE and ENDOSPERM NUCLEUS.

When a generative nucleus divides what are the resulting cells called?

During its transit inside the pollen tube, the generative cell divides to form two male gametes (sperm cells). Upon maturity, the microsporangia burst, releasing the pollen grains from the anther. Each pollen grain has two coverings: the exine (thicker, outer layer) and the intine.

How many chromosomes should be in an endosperm nucleus?

The endosperm mother cell has two polar nuclei so it contains a total of 8 chromosomes. There are 7 cells in the embryo sac, one of which (the endosperm mother cell) contains 2 nuclei. The egg cell, 2 synergid cells and 3 antipodal cells each contain one nucleus with 4 chromosomes.

Is pollen a cell?

Pollen itself is not the male gamete. Each pollen grain contains vegetative (non-reproductive) cells (only a single cell in most flowering plants but several in other seed plants) and a generative (reproductive) cell.

What is the ploidy of generative cell?

The generative cell divides by mitosis to produce two haploid sperm cells. The pollen tube reaches the micropyle of the ovule and digests its way into one of the synergids, releasing the sperm cells. The synergid degenerates as one of the two sperm cells fertilizes the egg cell, producing a diploid (2n) zygote.

What is Synergids function?

The synergids are also essential for the cessation of pollen tube growth and release of the sperm cells. The synergid cell wall forms a highly thickened structure called the filiform apparatus at the micropylar end, consisting of numerous finger-like projections into the synergid cytoplasm.