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Define self sterility / self incompatabl...

Define self sterility / self incompatablity.

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In some plants, when the pollen grains of a flower reaches the stigma of the same flower. It is unable to germinate on it. It is a contrivance for cross pollination.
Example: Abutilon.
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Define sterilization.

Assertion : Self-incompatibility is a genetic mechanism which prevents self-pollination and thereby fertilisation by inhibiting either pollen germination or pollen tube growth in the pistil. Reason : In gametophytic self-incompatibility, the incompatibility reaction is determined by the genotype of the sporophytic tissue of the plant from which the pollen is derived.

What is meant by self-incompatibility?

Which of the following sentences are correct? (I) Gibberellins play a role in sex determination in maize. (II) Multiple alleles determine self sterility in Nicotiana. (III) Crossing over leads to non-separation of linked genes. (IV) In incomplete linkage, crossing over is observed.

How is Nicotiana exhibit self-incompatibility? Explain its mechanism.

Assertion (A) : Self - sterility is observed in Nicotiana species. Reason (R) : Because the genes are located on chromosome.