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Question
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.
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.
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Solution
The correct option is C Assertion is correct but Reason is incorrect
Self-incompatibility refers to the inability of pollen from a flower to
germinate on the stigma of the same flower (or other flower of same
plant). Depending on the origin of factors determining the mating types
two categories of self-incompatibility have been recognized.
(i)
Gametophytic self-incompatibility (GSI). The incompatibility process is
determined by the genotype of male gametophyte (pollen) itself, e.g.,
Liliaceae, Poaceae, Solanaceae.
(ii) Sporophytic
self-incompatibility (SSI). The incompatibility process is controlled by
the genotype of the sporophytic tissue of the plant from which the
pollen is derived, e.g., Asteraceae, Brassicaceae.So, the correct answer is 'Assertion is correct but Reason is incorrect'.
Self-incompatibility refers to the inability of pollen from a flower to germinate on the stigma of the same flower (or other flower of same plant). Depending on the origin of factors determining the mating types two categories of self-incompatibility have been recognized.
(i) Gametophytic self-incompatibility (GSI). The incompatibility process is determined by the genotype of male gametophyte (pollen) itself, e.g., Liliaceae, Poaceae, Solanaceae.
(ii) Sporophytic
self-incompatibility (SSI). The incompatibility process is controlled by
the genotype of the sporophytic tissue of the plant from which the
pollen is derived, e.g., Asteraceae, Brassicaceae.
So, the correct answer is 'Assertion is correct but Reason is incorrect'.
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