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प्रश्न
What is the function of pollen tube? Explain with the help of a diagram.
उत्तर
Pollen grains deposited on the stigma absorb water and swell, due to which its exine ruptures and intine grows out as pollen tube. The pollen tube grows through the style by secreting enzymes that digest reserve food in the tissues of stigma and style. The vegetative nucleus moves to the tip of the pollen tube followed by the generative nucleus which divides into two male nuclei. Now the pollen tube enters the ovule through the micropyle and discharges the two male gametes into the embryo sac.
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संबंधित प्रश्न
Why do you think the zygote is dormant for sometime in a fertilised ovule?
What happens to the following after fertilization?
Stamens
Given ahead is a diagrammatic sketch of the sectional view of a germinating pollen grain. Study the same and then answer the question that follows:
Name the parts labelled 1, 2, 3, 4 and 5.
Name the scientists who have contributed to the following:
Discovered double fertilization.
Name the cell which divides to form male nuclei.
Identify the CORRECT statement with reference to cellular endosperm.
If the cells of the nucellus in the angiosperm ovule contain 24 chromosomes, then ____________ chromosomes will be present in the endosperm of a self-pollinated flower.
Double fertilization and triple fusion were discovered by ______.
Fusion of one of the male gametes with egg nucleus is referred to as ______.
Identity the part of embryo sac which takes part in formation of primary endosperm nucleus during fertlisation
