significant genetic diversity exists across species and landraces is correct because cultivated yams include multiple species, farmer-selected clones, and locally adapted landraces with substantial variation. This diversity is valuable for taste, adaptation, disease resistance, and breeding. That is the core fact the question is testing, and it fits established yam production or plant science much better than the distractors.

The bigger study takeaway is that yam cultivation is genetically rich, not uniform. A good way to remember this item is to think in terms of the real pattern behind it: a wide crop gene pool gives breeders and farmers options, even if some production systems rely on clones. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

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irregular flowering and low seed production is correct because breeding depends on sexual reproduction, but many yams flower unpredictably and set few seeds. That makes controlled crosses difficult and slows selection compared with crops that produce abundant seed reliably. That is the core fact the question is testing, and it fits established yam production or plant science much better than the distractors.

The bigger study takeaway is that breeding problems often begin with the flower, not the field. A good way to remember this item is to think in terms of the real pattern behind it: if crosses are hard to make, improvement programs progress slowly no matter how useful the target traits are. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

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in-vitro conservation and germplasm banks is correct because yam genetic resources can be maintained in collections of living material and tissue cultures that preserve named accessions over time. This helps protect diversity from loss in farmers' fields or from disease and environmental disruption. That is the core fact the question is testing, and it fits established yam production or plant science much better than the distractors.

The bigger study takeaway is that conservation science for vegetatively propagated crops often relies on curated germplasm systems. A good way to remember this item is to think in terms of the real pattern behind it: gene banks for yams must preserve biological material that can actually regenerate into plants. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

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disease resistance, particularly to viruses is correct because viruses can seriously reduce vigor, yield, and planting-stock quality in yams, so resistance is a major breeding goal. Because yams are often propagated vegetatively, viral problems can accumulate and spread from generation to generation. That is the core fact the question is testing, and it fits established yam production or plant science much better than the distractors.

The bigger study takeaway is that disease resistance has outsized value in clonally propagated crops. A good way to remember this item is to think in terms of the real pattern behind it: breeding for resistance helps protect both harvest quantity and the health of future planting material. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

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marker-assisted selection is correct because DNA markers let breeders track useful genes or genomic regions without waiting for every trait to be expressed fully in the field. This speeds selection and can improve efficiency in a crop with long cycles and complicated breeding. That is the core fact the question is testing, and it fits established yam production or plant science much better than the distractors.

The bigger study takeaway is that molecular tools help breeders make earlier, better-informed choices. A good way to remember this item is to think in terms of the real pattern behind it: marker-assisted selection turns invisible genotype information into practical breeding decisions. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

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long growing cycle and low multiplication rate is correct because yams take substantial time to grow and produce relatively limited planting material compared with many seed-propagated crops. That slows breeding, testing, and dissemination of improved varieties. That is the core fact the question is testing, and it fits established yam production or plant science much better than the distractors.

The bigger study takeaway is that crop biology sets the tempo of genetic improvement. A good way to remember this item is to think in terms of the real pattern behind it: when each cycle is long and each plant generates few propagules, progress naturally takes more time. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

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polyploidy (multiple sets of chromosomes) is correct because polyploidy complicates inheritance, segregation, and trait prediction because chromosome behavior is less straightforward than in simple diploids. That makes genetic analysis and breeding design harder in many yam varieties. That is the core fact the question is testing, and it fits established yam production or plant science much better than the distractors.

The bigger study takeaway is that more chromosome sets often means more breeding complexity. A good way to remember this item is to think in terms of the real pattern behind it: polyploid crops can be highly useful agriculturally, but their genetics are tougher to untangle. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

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on-farm conservation by traditional farmers is correct because landraces survive when farmers continue planting, selecting, exchanging, and valuing them in real production environments. This living conservation keeps adaptation and cultural knowledge linked to the crop. That is the core fact the question is testing, and it fits established yam production or plant science much better than the distractors.

The bigger study takeaway is that conservation is not only a laboratory activity; it can happen in fields and villages. A good way to remember this item is to think in terms of the real pattern behind it: traditional farmers act as ongoing custodians of diversity by maintaining landraces in use. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

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