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Question
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?
Solution
Even though each pollen grain has two male gametes, only one male gamete is used for fertilizing an ovule, while the other fuses with the polar nuclei to form the endosperm. Therefore, 20 pollen grains are needed to fertilize 20 ovules, as each pollen grain can fertilize only one ovule.
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RELATED QUESTIONS
What is triple fusion?
Why do you think the zygote is dormant for sometime in a fertilised ovule?
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
Given ahead is a diagrammatic representation of the process of fertilization. Study the same and then answer the question that follows:
What happens to
i) Ovary
ii) Ovule after fertilisation
The question has four options. Choose the correct answer:
When only ovary forms fruits they are known as
Define triple fusion.
Write a short note on Pollen kitt.
In double fertilization, the first male gamete fuses with the egg and the second male gan1ete fuses with which of the following?
By which of the following the megasporangium proper of an angiosperm ovule is represented?
Through which route the pollen tube can enter the ovule?
