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Covers topics from Agronomy Science:: Agri Quiz: Agronomy: Rice MCQ
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Multiple Choice Questions (MCQs) with instant answers and explanations.
1. What is the name of the protein found in rice?
Glutenin
Oryzenin
Zein
Gliadin
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Correct Answer: Oryzenin The primary protein found in rice is called Oryzenin. Rice generally has a lower protein content (6-7%) compared to other major cereals.
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2. Which gene is responsible for dwarfism in rice?
Norin-10
Rht-1
Opaque-2
Dee-Gee-Woo-Gen
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Correct Answer: Dee-Gee-Woo-Gen The gene responsible for the dwarf characteristic in many rice varieties is 'Dee-Gee-Woo-Gen'. This gene was crucial in developing high-yielding, lodging-resistant rice cultivars.
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3. What is the optimal temperature range for flowering (blooming) in rice?
20-25ยฐC
25-30ยฐC
26.5-29.5ยฐC
30-35ยฐC
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Correct Answer: 26.5-29.5ยฐC The ideal temperature for the blooming or flowering stage in rice cultivation is between 26.5ยฐC and 29.5ยฐC. Temperatures outside this range can affect pollination and grain setting.
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4. For which crops, besides rice, is slightly acidic soil (pH 4.5-6) considered suitable?
Wheat and Barley
Maize and Sorghum
Tea and Potato
Sugarcane and Cotton
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Correct Answer: Tea and Potato Slightly acidic soil conditions, with a pH range of 4.5 to 6, are considered suitable not only for rice but also for tea and potato cultivation.
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5. What is the recommended seed rate for the SRI (System of Rice Intensification) method?
15 kg/ha
40-50 kg/ha
75-90 kg/ha
5-8 kg/ha
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Correct Answer: 5-8 kg/ha The System of Rice Intensification (SRI) method requires a significantly lower seed rate compared to traditional methods, typically ranging from 5 to 8 kg per hectare.
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6. What are the two most critical stages for irrigation in rice cultivation?
Germination and Tillering
Tillering and Flowering
Booting and Panicle Initiation
Milking and Dough Stage
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Correct Answer: Booting and Panicle Initiation The critical stages where water availability is most crucial for rice yield are the Booting stage and the Panicle Initiation stage. Water stress during these periods significantly reduces grain formation.
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7. What is the approximate hulling percentage of rice?
50-55%
60-65%
66-67%
70-75%
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Correct Answer: 66-67% Hulling percentage, the ratio of white rice obtained from paddy, is typically around 66-67%, meaning about two-thirds of the paddy weight is retained as white rice after husk removal.
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8. Which vitamin is particularly lost during the milling process of rice?
Vitamin A
Vitamin B complex (especially B1)
Vitamin C
Vitamin D
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Correct Answer: Vitamin B complex (especially B1) The milling process, which removes the bran and germ layers to produce polished white rice, leads to a significant loss of B vitamins, particularly Thiamine (Vitamin B1).
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9. What is the purpose of parboiling rice?
To improve flavour
To increase whiteness
To harden grains and retain nutrients like B12
To reduce cooking time
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Correct Answer: To harden grains and retain nutrients like B12 Parboiling involves steam treating paddy before milling. This process helps retain some nutrients, like Vitamin B12, within the grain and makes the grains harder.
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10. Which tissue in rice leaves and stems facilitates oxygen transport, especially in waterlogged conditions?
Xylem
Phloem
Parenchyma (Aerenchyma)
Sclerenchyma
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Correct Answer: Parenchyma (Aerenchyma) Rice plants possess Parenchyma tissue (specifically Aerenchyma) in their leaves and stems. This tissue contains air spaces that allow for efficient oxygen transport from the leaves down to the submerged roots.
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11. Which biofertilizer is specifically mentioned for use in paddy fields without standing water?
Azolla
Blue-Green Algae (BGA)
Azotobacter
Rhizobium
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Correct Answer: Azotobacter While Azolla and BGA are common biofertilizers for flooded rice fields, Azotobacter is mentioned as being suitable for use in paddy fields where water is not standing. It fixes atmospheric nitrogen.
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12. The 'Drum Culture Technique' for rice was primarily developed for what purpose?
Increasing pest resistance
Improving grain quality
Timely sowing and saving water
Enhancing aroma
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Correct Answer: Timely sowing and saving water The Drum Culture Technique, developed by Dr. Dastane and IRRI, aims to facilitate timely sowing of rice and conserve water, often utilizing pre-germinated seeds.
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13. In what form does the rice crop primarily absorb nitrogen?
Only Nitrate (NO3-)
Only Ammonium (NH4+)
Both Ammonium (NH4+) and Nitrate (NO3-)
Organic Nitrogen
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Correct Answer: Both Ammonium (NH4+) and Nitrate (NO3-) Rice plants are capable of absorbing nitrogen in both the ammonium (NH4+) and nitrate (NO3-) forms. However, in flooded anaerobic conditions, the ammonium form is often more prevalent and preferred.
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14. What is the estimated amount of water required to produce 1 kg of dry matter (paddy)?
1000 liters
2000 liters
3000 liters
5000 liters
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Correct Answer: 5000 liters Rice is a water-intensive crop, requiring approximately 5000 liters of water to produce just 1 kg of dry paddy. This highlights the crop's high water demand.
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15. Which gas is commonly released from flooded rice fields?
Carbon Dioxide (CO2)
Methane (CH4)
Nitrous Oxide (N2O)
Oxygen (O2)
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Correct Answer: Methane (CH4) Flooded rice paddies create anaerobic conditions suitable for methanogenic bacteria, leading to the emission of Methane (CH4), a potent greenhouse gas.
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16. Continuous consumption of polished rice can lead to which deficiency disease?
Scurvy
Pellagra
Beriberi
Rickets
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Correct Answer: Beriberi Beriberi is a disease caused by Thiamine (Vitamin B1) deficiency. Continuous consumption of highly polished rice, which has lost most of its thiamine during milling, can lead to this condition.
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17. Where is the International Rice Research Institute (IRRI) located?
Cuttack-India
Hyderabad-India
Los Baรฑos-Philippines
Rome-Italy
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Correct Answer: Los Baรฑos-Philippines The International Rice Research Institute (IRRI), a major center for rice research and development, is located in Los Baรฑos, near Manila, in the Philippines.
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18. Echinochloa colonum is considered what type of weed in rice?
Aquatic weed
Broad-leaf weed
Parasitic weed
Mimicry weed
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Correct Answer: Mimicry weed Echinochloa colonum, commonly known as jungle rice or barnyard grass, is a major mimicry weed in rice fields. It closely resembles rice seedlings, making it difficult to distinguish and control early on.
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19. Which herbicide, also known as Saturn, is mentioned as commonly used in Rajasthan for rice weed control?
Propanil (Stam F-34)
Butachlor
Benthiocarb
Pendimethalin
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Correct Answer: Benthiocarb Benthiocarb, marketed under the trade name Saturn, is specifically as a herbicide used for weed control in rice, particularly its use in Rajasthan.
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20. In the Wet Bed Method of raising rice nursery, what proportion of the main field area is typically used for the nursery?
1/5th
1/10th
1/20th
1/50th
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Correct Answer: 1/10th For the Wet Bed Method, the nursery area is generally prepared on 1/10th of the total area that is intended for transplanting in the main field.
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21. How many days after sowing are seedlings typically ready for transplanting in the Dapog method?
8-10 days
11-13 days
20-25 days
25-30 days
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Correct Answer: 11-13 days The Dapog method is known for producing transplantable seedlings very quickly, typically within 11-13 days after sowing. This is much faster than traditional wet or dry bed methods.
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22. Which rice nursery method requires the least amount of nursery area per hectare?
Dry Bed Method
Wet Bed Method
SRI Method
Dapog Method
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Correct Answer: Dapog Method The Dapog method requires the smallest nursery area, needing only about 25-30 square meters to raise seedlings for one hectare of main field.
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23. The SRI method of rice cultivation was developed in which country?
Philippines
India
Madagascar
Japan
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Correct Answer: Madagascar The System of Rice Intensification (SRI) was developed in Madagascar in the 1980s by Fr. J. Henri de Laulaniรฉ.
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24. Which subspecies of Oryza sativa is primarily cultivated in Indonesia and known as 'Balu Paddy'?
Indica
Japonica
Javanica
Glaberrima
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Correct Answer: Javanica Oryza sativa subsp. Javanica is mainly cultivated in Indonesia and is also referred to as 'Balu Paddy'. It is resistant to lodging.
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25. Rice grown during the winter season (sown June-July, harvested Nov-Dec) is locally known by what name in India?
Aus
Aman
Boro
Kharif
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Correct Answer: Aman Based on the sowing season, rice grown during the main monsoon/winter period (sown June-July, harvested Nov-Dec) is traditionally called 'Aman' rice.
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26. Golden Rice was developed to combat the deficiency of which vitamin?
Vitamin C
Vitamin D
Vitamin K
Vitamin A
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Correct Answer: Vitamin A Golden Rice is genetically modified to produce beta-carotene, a precursor to Vitamin A. It was developed by Ingo Potrykus and team to help address Vitamin A deficiency, particularly in regions heavily reliant on rice.
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27. Who is credited with the development of the 'Super Rice' concept?
Yuan Longping
E.A. Siddiqui
Ingo Potrykus
G.S. Khush
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Correct Answer: G.S. Khush Dr. Gurdev Singh Khush (G.S. Khush) from IRRI is credited with developing the concept of 'Super Rice', aiming for varieties with significantly higher yield potential and nutritional value.
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28. Which rice variety is known as the 'Miracle Rice' or 'Magic Rice of the World'?
TN-1
Jaya
IR-8
Basmati-370
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Correct Answer: IR-8 IR-8, developed at IRRI, is often called the 'Miracle Rice' or 'Magic Rice of the World' due to its high yield potential which played a significant role in the Green Revolution.
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29. Which variety represents the first semi-dwarf rice variety introduced to the world, utilizing the Dee-Gee-Woo-Gen?
Jaya
IR-8
TN-1 (Taichung Native-1)
Jagannath
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Correct Answer: TN-1 (Taichung Native-1) TN-1 (Taichung Native-1) was the first semi-dwarf rice variety developed and released, incorporating the Dee-Gee-Woo-Gen for reduced height. It originated from Taiwan.
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30. The Rice Yellow Stem Borer (Tryporyza incertulas) causes maximum damage to which type of rice?
Hybrid Rice
Upland Rice
Basmati Rice
Deep Water Rice
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Correct Answer: Basmati Rice The Yellow Stem Borer is noted to cause the most significant damage specifically to Basmati rice varieties. Its infestation leads to characteristic 'white ears'.
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31. The Brown Planthopper (Nilaparvata lugens) is a vector for which viral disease in rice?
Tungro Virus
Rice Blast
Grassy Stunt Virus
Bacterial Leaf Blight
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Correct Answer: Grassy Stunt Virus The Brown Planthopper (BPH), Nilaparvata lugens, is a major sucking pest of rice and acts as a vector for the Grassy Stunt Virus disease.
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32. The devastating Bengal famine of 1943 was largely attributed to the failure of the rice crop due to which disease?
Bacterial Leaf Blight
Tungro Virus
Rice Blast
Brown Leaf Spot
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Correct Answer: Brown Leaf Spot The great Bengal famine in 1943 was significantly exacerbated by a severe epidemic of Brown Leaf Spot disease, caused by the fungus Helminthosporium oryzae, which destroyed the rice crop.
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33. Kresek is a severe, wilting phase associated with which rice disease, often seen in nurseries?
Rice Blast
Sheath Blight
Bacterial Leaf Blight (BLB)
False Smut
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Correct Answer: Bacterial Leaf Blight (BLB) Kresek refers to the acute, systemic wilting phase of Bacterial Leaf Blight (BLB), caused by Xanthomonas oryzae pv. oryzae. It often affects seedlings in the nursery, causing rapid drying and death.
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34. Khaira disease in rice, characterized by rusty brown spots on leaves, is caused by the deficiency of which micronutrient?
Iron (Fe)
Manganese (Mn)
Zinc (Zn)
Copper (Cu)
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Correct Answer: Zinc (Zn) Khaira disease is a physiological disorder in rice caused by Zinc (Zn) deficiency, particularly common in submerged or alkaline soils. It was first identified by Dr. Y.L. Nene.
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