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Questions
What is Siphonogamy?
Define the siphonogamy.
Solution
The pollen tube carrying male gametes penetrates in one of the synergids. Watery contents of synergid are absorbed by the pollen tube, which then ruptures and releases the contents, including the two non-motile male gametes. As non-motile male gametes are carried through hollow pollen tubes, it is known as siphonogamy that ensures fertilization to take place.
RELATED QUESTIONS
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
Name of the part of the ovary which gives rise to:
Seed ______
What are the advantages of the following in the flower to the plant concerned?
Smooth and light pollen
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:
Where does the germination of the pollen grain take place and how?
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?
Long Answer Question:
Draw a labeled diagram of the L.S. of anatropous ovule and list the components of the embryo sac and mention their fate after fertilization.
‘Pollination in Gymnosperms is different from Angiosperms’ – Give reasons.
Give a concise account of the steps involved in the fertilization of an angiosperm plant.
In double fertilization, the first male gamete fuses with the egg and the second male gan1ete fuses with which of the following?
Identity the part of embryo sac which takes part in formation of primary endosperm nucleus during fertlisation
