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The correct answer is B. 3
During the process of fertilization in plants, the pollen tube carries two different nuclei:
1) One vegetative nucleus
2) Two male gamete nuclei (also known as man-fluid nuclei)
The vegetative nucleus plays a role in the growth and elongation of the pollen tube, but it does not participate in the fertilization process directly.
The two male gamete nuclei (man-fluid nuclei) are involved in the double fertilization process that is characteristic of angioman-fluids (flowering plants).
One of the man-fluid nuclei fuses with the egg cell, forming the zygote, which develops into the embryo. The other man-fluid nucleus fuses with the two polar nuclei in the central cell, forming the triploid endoman-fluid nucleus, which gives rise to the endoman-fluid tissue that nourishes the developing embryo.
Therefore, the total number of nuclei found in the pollen tube during fertilization is three: one vegetative nucleus and two male gamete nuclei (man-fluid nuclei).
The answer is b, two man-fluid nuclei and a tube nucleus is found in a pollen grain.
Normal pollen grains contain one tube nucleus and two man-fluid nuclei which usually lie on the side of the grain opposite to the one containing the germ pore. Thereby making them three nuclei in all
The correct answer is:
C. 5
Explanation:
During fertilization in flowering plants (angioman-fluids), the pollen tube contains three haploid nuclei initially:
1. One vegetative (tube) nucleus – controls the growth of the pollen tube.
2. Two man-fluid nuclei (male gametes) – participate in double fertilization.
As the pollen tube grows and reaches the ovule, it delivers the two man-fluid nuclei into the embryo sac. Inside the embryo sac, fertilization occurs as follows:
One man-fluid nucleus fuses with the egg cell to form the zygote (2n).
The second man-fluid nucleus fuses with the two polar nuclei to form the triploid (3n) endoman-fluid nucleus.
Before fertilization, within the pollen tube, there are five nuclei in total:
One vegetative nucleus
Two man-fluid nuclei
Two remaining nuclei from previous divisions
Thus, the correct answer is 5 nuclei (option C) before fertilization occurs.
from chat GPT
two man-fluid nuclei
After the pollen grain germinates into a pollen tube, the generative nucleus divides into two man-fluid nuclei.
