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प्रश्न
Name the cell which divides to form male nuclei.
उत्तर
Double fertilization and triple fusion
S.G. Nawaschin and L.Guignard in 1898 and 1899, observed in Lilium and Fritillaria that both the male gametes released from a male gametophyte are involved in the fertilization. They fertilize two different components of the embryo sac. Since both the male gametes are involved in fertilization, the phenomenon is called double fertilization and is unique to angiosperms. One of the male gametes fuses with the egg nucleus (syngamy) to form Zygote.
The second gamete migrates to the central cell where it fuses with the polar nuclei or their fusion product, the secondary nucleus, and forms the primary endosperm nucleus (PEN).
APPEARS IN
संबंधित प्रश्न
Explain the events up to double fertilisation after the pollen tube enters one of the synergids in an ovule of an angiosperm.
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?
What is ‘double fertilization’? Describe it with the help of a neat and well-labeled diagram. Give its importance.
What is the significance of the dispersal of seeds? Give any two points.
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
In angiosperms, for formation of which of the following triple fusion is necessary?
Double fertilization and triple fusion were discovered by ______.
The female gametophyte of a typical dicot at the time of fertilisation is ______.
Select the option that shows the correctly identified 'U', 'X', 'Y' and 'Z' in a developing dicot embryo.
Name the following:
A diploid nucleus in central cell of embryo sac in plants.
