Nigeria is correct because global yam production is heavily concentrated in West Africa, and Nigeria grows far more yams than any other country. Yam is both a staple food and a major farm crop in nigeria, so production is enormous compared with countries where yams are minor specialty crops. 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 production geography matters: the biggest producer is usually the place where a crop is most culturally and economically central. A good way to remember this item is to think in terms of the real pattern behind it: thinking about where yams are eaten every day leads to the same answer, because demand, farming knowledge, and planting area reinforce one another. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

Tags: none

over 90% is correct because West Africa dominates world yam output, with the region accounting for the overwhelming majority of production. The crop is deeply embedded in farming systems, diets, and local markets there, so global totals are not spread evenly across continents. 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 economics is regionally concentrated rather than globally balanced. A good way to remember this item is to think in terms of the real pattern behind it: this question is really about concentration: when one region specializes strongly in a crop, it can supply nearly the whole world total. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

Tags: none

short shelf life and storage challenges is correct because fresh yams are bulky, easily damaged, and vulnerable to rot, dehydration, and pest losses after harvest. Those postharvest problems make shipping and storing fresh tubers expensive and risky, especially over long distances. 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 trade is often limited less by tariffs than by biology and logistics. A good way to remember this item is to think in terms of the real pattern behind it: processed products travel better than raw tubers because drying or milling reduces spoilage and shipping risk. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

Tags: none

yam flour and processed yam products is correct because processing extends shelf life, reduces bulk and spoilage risk, and makes the crop easier to transport internationally. Flour, chips, and similar products fit modern retail and export channels better than fragile fresh tubers. 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 value addition can turn a locally consumed root crop into a more tradable product. A good way to remember this item is to think in terms of the real pattern behind it: the biggest trade growth usually comes from forms that solve storage and transport constraints rather than from exotic niche uses. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

Tags: none

the Food and Agriculture Organization of the United Nations (FAO) is correct because FAO is the widely used international source for agricultural production data reported by countries. Researchers, governments, and commodity analysts rely on faostat and related fao datasets for cross-country comparisons. 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 when a question asks who publishes global crop statistics, FAO is the standard institutional answer. A good way to remember this item is to think in terms of the real pattern behind it: specialty-sounding groups may appear plausible, but broad international agriculture statistics are usually compiled by established UN bodies. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

Tags: none

competition from other starchy staples like cassava and rice is correct because farmers and consumers compare staples by yield, labor, price, storage, and convenience, and those comparisons can shift acreage away from yams. Cassava and rice often compete well where they are cheaper, easier to process, or supported by policy and markets. 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 crops compete economically, not just biologically. A good way to remember this item is to think in terms of the real pattern behind it: a traditional crop can lose relative importance even if it remains culturally valued, simply because other staples fit modern production and consumption systems better. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

Tags: none

health food and ethnic cuisine markets is correct because specialty varieties gain demand where consumers value heritage foods, diversity, texture, flavor, or perceived nutritional benefits. Diaspora communities and health-oriented shoppers often support premium prices for less common yam types. 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 niche demand often grows where culture and wellness marketing overlap. A good way to remember this item is to think in terms of the real pattern behind it: specialty crop demand usually emerges from food identity and consumer preferences, not from industrial sectors unrelated to eating. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

Tags: none

weather conditions and resulting harvest yields is correct because yam supply changes sharply when rainfall, temperature, storms, or drought affect planting, growth, and harvest. Because food demand is relatively steady, a poor harvest can tighten supply and raise prices while a strong harvest can soften prices. 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 agricultural prices often move with supply shocks from weather. A good way to remember this item is to think in terms of the real pattern behind it: for perishable or semi-storable crops, yield variation is a much stronger driver of annual price swings than unrelated political or fashion effects. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

Tags: none

30-60% is correct because postharvest losses can be very high where storage structures, pest control, transport, and curing systems are limited. Large tubers may bruise, rot, sprout, or dehydrate before they are eaten or sold, especially in warm, humid conditions. 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 production alone does not equal food availability; loss management is economically crucial. A good way to remember this item is to think in terms of the real pattern behind it: loss estimates are high because the main bottlenecks often occur after harvest rather than in the field. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

Tags: none

a staple food crop and sometimes a form of currency or wealth indicator is correct because in many West African societies, yams are tied to status, ceremonies, bridewealth, gifting, and everyday food supply. That gives them both nutritional value and social value, so they function as more than a simple commodity. 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 economics includes cultural institutions as well as market exchange. A good way to remember this item is to think in terms of the real pattern behind it: a crop can serve as wealth because it stores labor, land access, and social prestige in a visible, tradable form. Once you connect the answer to that pattern, the question becomes a logical conclusion instead of a fact to memorize in isolation.

Tags: none