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प्रश्न
Where and how does triple fusion take place?
उत्तर
Since two types of fusions, syngamy and triple fusion, take place in an embryo sac the phenomenon is termed double fertilisation, an event unique to flowering plants. The central cell after triple fusion becomes the primary endosperm cell (PEC) and develops into the endosperm, while the zygote develops into an embryo.
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संबंधित प्रश्न
What is double fertilisation? Describe the process in brief.
'Formation of primary endosperm nucleus is called triple fusion'. Give reason
What is triple fusion?
Why do you think the zygote is dormant for sometime in a fertilised ovule?
Read the following statement and answer the questions that follow :
"A guava fruit has 200 viable seeds."
(a) What are viable seeds?
(b) Write the total number of :
(i) Pollen grains (ii) Gametes
in producing 200 viable guava seeds.
c) Prepare a flow-chart to depict the post-pollination events leading to viable-seed production in a flowering plant.
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
Explain the Following Term:
Ornithophily
What happens to the following after fertilization?
Stamens
What is the function of the pollen tube? Explain it with the help of a diagram.
Given ahead is a diagrammatic representation of the process of fertilization. Study the same and then answer the question that follows:
What is the function of the synergids?
What is ‘double fertilization’? Describe it with the help of a neat and well-labeled diagram. Give its importance.
What is ‘double fertilization’? Describe it with the help of a neat and well-labeled diagram. Give its importance.
Define fertilization.
The question has four options. Choose the correct answer:
When only ovary forms fruits they are known as
Why fertilization process in angiosperms is called as double fertilization?
Give any four points of significance of double fertilization.
Male gametes in angiosperms are formed by the division of ______.
Transmitting tissue is found in
In majority of plants pollen is liberated at
Define triple fusion.
‘Pollination in Gymnosperms is different from Angiosperms’ – Give reasons.
Write a short note on Heterostyly.
Which of the following happens during triple fusion?
In double fertilization, the first male gamete fuses with the egg and the second male gan1ete fuses with which of the following?
The success of seed plants on land is mainly due to ______.
Due to which of the following reasons the pollen tube usually grows down towards the egg?
Identify the function of filiform apparatus.
What would be the number of chromosomes in the megaspore mother cell of the plant if an endosperm of an angiosperm has 24 chromosomes?
Through which route the pollen tube can enter the ovule?
In a breeding experiment, the selected male parent is diploid and the female parent is tetraploid. What will be the ploidy level of the endosperm that will develop after double fertilisation?
Double fertilization is fusion of ______.
Double fertilisation was first discovered in 1898 by ______ in Fritillaria and Lilium.
Find out the CORRECT sequence of events taking place in pollen - pistil interaction.
- Pollen tube enters one of the synergids and bursts to release male gametes.
- Pollen tube enters the ovule through the micropyle of the ovary.
- The pollen tube grows through the stigmatic tissue and then style.
- Pistil recognizes the correct pollen and accepts it.
What is the function of the two male gametes produced by each pollen grain in angiosperms?
Give a term for the following:
Fusion of male gamete and secondary nucleus in angiosperms.
