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प्रश्न
What is Siphonogamy?
Define the siphonogamy.
उत्तर
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.
संबंधित प्रश्न
(a) Explain the events after pollination leading to the formation of a seed in angiosperms.
(b) Mention the ploidy levels of the cells of different parts of an albuminous seed.
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?
Do you think fruits are important for the plant?
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.
The correct order of haploid, diploid, and triploid structure in fertilized embryo sac is
Define triple fusion.
What is polyembryony? How it can commercially exploited.
Give a concise account of the steps involved in the fertilization of an angiosperm plant.
In the figure given below label the following parts: male gametes, egg cell, polar nuclei, synergid and pollen tube
Give a term for the following:
Fusion of male gamete and secondary nucleus in angiosperms.
