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Questions
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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Solution
- 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.
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RELATED QUESTIONS
Give an account of pollen pistil interaction in detail.
After a successful germination, the tip of the pollen tube enters in one of the______ and then ruptures to release the contents.
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.
Fill up the blanks with suitable words and select the correct option.
The ability of the pistil to recognize pollen is dependent on ____________ components and ____________ guide the entry of pollen tube. This study leads to help ____________ in getting ____________ even in ____________.
p. Chemical
q. Plant breeders
r. Hybrids
s. Incompatible pollination
t. Synergids
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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 is porogamy?
What is syngamy in the context of double fertilisation?
What is triple fusion in double fertilisation?
Which factor promotes pollen tube growth by providing energy and preventing osmotic damage?
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