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Question
Which is the triploid tissue in a fertilised ovule? How is the triploid condition achieved?
Solution
The triploid tissue in the ovule is the endosperm. Its triploid condition is attained due to the fusion of two polar nuclei and one nucleus of male gamete (also referred to as triple fusion).
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RELATED QUESTIONS
Double fertilization is reported in plants of both, castor and groundnut. However, the mature seeds of groundnut are non-albuminous and castor are albuminous. Explain the post fertilization events that are responsible for it.
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
(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.
What happens to the following after fertilization?
Stamens
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:
What is the function of the part labelled '4'?
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:
What happens to the part labelled '5' during the process?
The question has four options. Choose the correct answer:
One male gamete fuses with the egg and forms a diploid zygote. This process is called
Pollen tube was discovered by
Male gametes in angiosperms are formed by the division of ______.
What is polyembryony? How it can commercially exploited.
Explain the development of a Dicot embryo
Due to which of the following reasons the pollen tube usually grows down towards the egg?
Through which route the pollen tube can enter the ovule?
Double fertilization is fusion of ______.
Double fertilization is characteristic of ______.
Name the part of gynoecium that determines the compatible nature of pollen.
In the figure given below label the following parts: male gametes, egg cell, polar nuclei, synergid and pollen tube
