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50 free Rice trivia questions with answers — trivia quiz, new questions added Aug 2026.
Rice feeds more than half the people on Earth. It was domesticated in China at least 9,000 years ago, separately in West Africa, and it now covers everything from sticky sushi rice to saffron paella, from the terraces of Ifugao to the labs of the International Rice Research Institute. This quiz covers the plant, the paddy, the trade, the science and the dishes. Good for food and agriculture quizzes, classroom science, or Filipino and Asian trivia nights where rice is never far from the table. Every answer comes with a short explanation.
30 of 50 questions with answers and explanations. Play the quiz
Q 01Rice is the staple food of roughly what share of the world's population?
Over half
It is eaten most heavily in Asia and Africa; the three biggest consuming countries are all in Asia.
Q 02What is the scientific name of Asian rice?
Oryza sativa
African rice is a different species, Oryza glaberrima, domesticated separately in West Africa.
Q 03In which country was Asian rice first domesticated, at least 9,000 years ago?
China
Neolithic cultures in the Upper and Lower Yangtze tamed it from the wild rice Oryza rufipogon.
Q 04African rice was domesticated independently about how long ago?
3,000 years
The Spanish later carried the African species to the Americas.
Q 05Which two crops outrank rice in world production by weight?
Sugarcane and maize
About 800 million tonnes of rice were grown in 2023, but only some 8% of it was traded across borders.
Q 06Which two countries together grow about 52% of the world's rice?
China and India
Asia as a whole accounts for 90% of production.
Q 07By 2012, which country was the world's largest exporter of rice?
India
Developing countries dominate the trade; the biggest producer, once an exporter, had become the largest importer by 2013.
Q 08What is unmilled rice still in its husk called?
Paddy
The word comes from Malay padi; the grain is ready to harvest at 20–25% moisture.
Q 09Brown rice is grain that has had only what removed?
The inedible husk
Milling further strips the bran and germ to make successively whiter rice.
Q 10Parboiled rice is treated how before milling?
Steamed
The process hardens the grain and pushes vitamins and minerals into the white part so they survive milling.
Q 11Which two starch components give different rice varieties their texture?
Amylose and amylopectin
Sticky mochi rice is very low in amylose and high in amylopectin, which gives it that gel-like chew.
Q 12Black rice is called "forbidden rice" because it was once reserved for whom?
The royal family
Its dark purple colour comes from high levels of anthocyanins.
Q 13Which medium-grain variety founded the Californian rice industry?
Calrose
Carnaroli is considered the king of Italian rice, while Koshihikari is a prized Japanese sushi rice.
Q 21In which Philippine town is the International Rice Research Institute headquartered?
Los Baños
Founded in 1960, it bred the varieties that drove Asia's Green Revolution and keeps a genebank of over 100,000 types.
Q 22What was the first Green Revolution rice variety, produced at IRRI in 1966?
IR8
It crossed an Indonesian variety, Peta, with a Chinese one, Dee Geo Woo Gen, and had short strong stems that would not fall over.
Q 23Which Chinese scientist set a world rice yield record of 17.1 tonnes per hectare in 1999?
Yuan Longping
He used hybrid rice with the System of Rice Intensification; the world average is about 4.7 tonnes per hectare.
Q 14Golden rice was genetically engineered to supply a precursor of which nutrient?
Vitamin A
It makes beta-carotene in the grain; in 2016 more than 100 Nobel laureates urged its use.
Q 15Roughly how much of cooked white rice is water?
69%
The rest is about 29% carbohydrate and 2% protein, with a useful dose of manganese.
Q 16Rice is suitable for coeliacs because it contains no what?
Gluten
It does provide protein, though not all the essential amino acids in sufficient amounts.
Q 17Which greenhouse gas do flooded rice paddies release in large amounts?
Methane
Long flooding starves the soil of oxygen, so organic matter ferments; alternate wetting and drying can cut emissions by up to 90%.
Q 18Rice cannot set grain if its flowers spend more than an hour at or above what temperature?
35 °C
IRRI has predicted Asian yields could fall about 20% for every 1 °C rise in global mean temperature.
Q 19Rice blast, the most serious disease of growing rice, is caused by what kind of organism?
A fungus
Magnaporthe grisea and bacterial leaf streak are perennially the two worst rice diseases worldwide.
Q 20Farmers in parts of Asia traditionally raise which animals in paddies to control pests?
Ducks and fish
The animals eat pests, manure the rice and, in the ducks' case, trample weeds, while yielding an extra crop.
Q 24Rice was the first crop plant to have what completed, in 2005?
Its full genome sequenced
Hundreds of wild and cultivated rice genomes have been sequenced since.
Q 25So-called "scuba rice" carrying the Sub1A gene can survive being underwater for how long?
Two weeks
Standard varieties die after about a week of stagnant flooding; IRRI has distributed Sub1A rice across South and Southeast Asia.
Q 26Rice is sensitive to cold and will not grow well below roughly what temperature?
12 °C
Cold-tolerant risotto and basmati varieties were nonetheless trialled successfully on peaty soil in England in 2025.
Q 27Which barley gene, put into rice, cut the crop's greenhouse gas emissions by up to 97%?
SUSIBA2
It shifts growth from roots to shoots, starving the gas-making soil bacteria while boosting grain.
Q 28From seed to harvest, a rice crop typically takes about how long?
Six months
In deep water the plant can stretch to 5 metres, and in the tropics it can even survive as a perennial.
Q 29Transplanting rice seedlings by hand needs about how much seed per hectare?
40 kg
Direct seeding uses 60 to 80 kg per hectare but far less labour; most rice in Asia is still transplanted by hand.
Q 30At the start of the American Revolution, rice ranked where among colonial exports?
Fourth
Only tobacco, wheat and fish were worth more; rice had reached the Americas with the Columbian exchange.