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प्रश्न
Incompatibility is a natural barrier in the fusion of gametes. How will you explain this statement?
'Incompatibility is a natural barrier in the fusion of gametes'. Justify the statement.
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उत्तर
- Incompatibility refers to the inability of certain gametes, even from genetically similar plant species, to fuse with each other.
- It is considered the most prevalent and effective device to avoid inbreeding and outbreeding.
- Pollen-pistil interaction is a dynamic process that involves pollen recognition followed by promotion or inhibition of the pollen.
- Chemical substances released by the style act as a barrier.
- Typically the pollen belonging to the correct mating type germinates on the stigma, develops a pollen tube, and brings about fertilization.
- The pollens belonging to the other mating type are discarded.
Thus, incompatibility is a natural barrier in the fusion of gametes.
संबंधित प्रश्न
Which of the following induces pollen germination and tube growth in vitro?
Identify the INCORRECT statement from the following.
i. The compatible pollen absorbs water and nutrients from the surface of stigma, germinates and produces pollen tube.
ii. The pistil has the ability to recognise and accept the right or compatible pollen of the same species.
iii. Pollination always guarantee the transfer of right type of pollen grain on stigma.
Following are the diagrams of entry of pollen tube into ovule. Identify the type A and B.
In angiosperms, pollen tube liberates their, male gametes into the ______.
The compatibility and incompatibility of the pollen-pistil interaction is determined by ______.
In angiosperms normally on the surface of stigma only ______ pollens germinate successfully.
All are events of pollen-pistil interaction EXCEPT ______
Which of the following is NOT a natural agent that brings pollen grains to the receptive stigma?
What role do proteins and chemical secretions on the stigma surface play in pollen-pistil interaction?
Which layer of the pollen grain grows out through the germ pore to form the pollen tube?
What are the two components that initially move into the pollen tube after germination?
Which type of pollen tube entry into the ovule occurs through the chalazal end?
What happens when the pollen tube tip enlarges and ruptures inside the embryo sac?
What is syngamy in the context of double fertilisation?
What is the role of boron in pollen tube growth?
What would be the ploidy level of the endosperm tissue after triple fusion occurs?
Which of the following is NOT mentioned as a factor promoting pollen tube growth?
How does the population effect of calcium contribute to pollen tube growth?
What is the relationship between the germ pore and pollen tube formation?
