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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.
APPEARS IN
संबंधित प्रश्न
Triple Fusion involves:
(i) Fusion of one male, gamete with female gamete
(ii) Fusion of tube nucleus with generative nvcleus
(iii) Fusion of two polar nuclei.
(iv) Fusion of second male gamete with two polar nuclei
Give one word/term for the following:
When pollen grains of a flower reach the stigma of the same flower.
Even though each pollen grain has 2 male gametes, why at least 20 pollen grains are required to fertilize 20 ovules in a particular carpel?
Pollen tube was discovered by
Size of pollen grain in Myosotis
Syngamy results in the formation of ______.
What is Mellitophily?
Write a short note on Heterostyly.
By which of the following double fertilization is exhibited?
Identify the function of filiform apparatus.
