Question:
Which of the following is characterized by non functional pollen grains, while female gametes function normally?
Which of the following is characterized by non functional pollen grains, while female gametes function normally?
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Male Sterility: Plant has working female parts (ovules) but non-working male parts (pollen is absent, malformed, or non-viable). Can receive pollen, cannot donate.
Self-Incompatibility: Plant has working pollen AND working ovules, but its own pollen cannot fertilize its own ovules due to a genetic block. The question describes male sterility.
Updated On: Jul 2, 2026
- Self-incompatibility
- Male sterility
- Pure line
- Pedigree
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The Correct Option is B
Approach Solution - 1
Let's analyze the given terms:
(1) Self-incompatibility: A genetic mechanism where viable, functional pollen from a plant is unable to fertilize the ovules of the same plant (or plants with identical S-alleles). Both male and female gametes are functional, but their fusion is prevented due to genetic recognition.
(2) Male sterility: A condition in which a plant produces non-functional pollen grains, or no pollen at all, while its female gametes (ovules) are fertile and function normally. This means the plant can be pollinated by functional pollen from another plant (acting as a female parent) but cannot act as a male parent. This fits the description perfectly.
(3) Pure line: A population of plants that is homozygous for most traits and breeds true upon self-pollination. It relates to genetic uniformity, not pollen functionality per se.
(4) Pedigree: A record of the ancestry or lineage of an individual or variety. The characteristic "non functional pollen grains, while female gametes function normally" is the definition of male sterility. Male sterility
(1) Self-incompatibility: A genetic mechanism where viable, functional pollen from a plant is unable to fertilize the ovules of the same plant (or plants with identical S-alleles). Both male and female gametes are functional, but their fusion is prevented due to genetic recognition.
(2) Male sterility: A condition in which a plant produces non-functional pollen grains, or no pollen at all, while its female gametes (ovules) are fertile and function normally. This means the plant can be pollinated by functional pollen from another plant (acting as a female parent) but cannot act as a male parent. This fits the description perfectly.
(3) Pure line: A population of plants that is homozygous for most traits and breeds true upon self-pollination. It relates to genetic uniformity, not pollen functionality per se.
(4) Pedigree: A record of the ancestry or lineage of an individual or variety. The characteristic "non functional pollen grains, while female gametes function normally" is the definition of male sterility. Male sterility
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Approach Solution -2
Contrast-table approach: Compare the four terms by what part of reproduction they affect. Self-incompatibility blocks fertilization even though both pollen and ovules are fully functional, it's a recognition barrier, not a fertility defect. Pure line and pedigree describe breeding/record-keeping concepts unrelated to gamete function. Male sterility is unique among the four because it specifically describes a fertility defect confined to the male side, pollen fails to form properly or function, while the female gametes remain completely normal, allowing the plant to be used as a female (seed) parent in hybrid seed production. This exact pattern (pollen non-functional, ovules normal) defines male sterility.
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