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In the following question, a statement of assertion (A) is followed by a statement of reason (R)
A: Allele of pollen happens to be one of the two alleles of pistil, the pollen fails to form a pollen tube.
R: The incompatibility is due to the genotype of the pollen producing plant.
If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
If Assertion is a true statement but Reason is false, then mark (3).
If both Assertion and Reason are false statements, then mark (4).
Answers (1)
Statement A suggests that when the allele of the pollen matches one of the two alleles of the pistil, the pollen fails to form a pollen tube. This statement indicates that there is an incompatibility between the pollen and pistil alleles, resulting in the failure of pollen tube formation.
Statement R proposes that the incompatibility is due to the genotype of the pollen-producing plant. It suggests that the genotype of the plant producing the pollen determines its compatibility or incompatibility with the pistil.
To evaluate these statements, we need to consider the concept of self-incompatibility in plants. Self-incompatibility is a mechanism that prevents self-fertilization and promotes outcrossing by inhibiting pollen tube growth when the pollen's genotype matches one of the alleles present in the pistil.
Both statements A and R are correct in this context. Statement A describes the specific scenario where the allele of the pollen matches one of the pistil alleles, leading to the failure of pollen tube formation. Statement R provides the general explanation that the genotype of the pollen-producing plant determines the incompatibility.
Therefore, both statements A and R contribute to understanding the phenomenon of self-incompatibility in plants. Hence, the correct answer is option 1.
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