Paddy (Oryza sativa)
Field Crop – Paddy (Oryza sativa)
Question And Answers
Quest. The botanical name and family of paddy.
Ans. Oryza sativa, Poaceae
Quest. The chromosome number of paddy.
Ans. 2n = 24.
Quest. The cultivated spp. of paddy.
Ans. O. sativa and O. glaberima
Quest. The protein (Oryzein) content in paddy.
Ans. 6-7%
Quest. Indica rice is grown in.
Ans. India
Quest. Japonica rice is grown in.
Ans. Japan
Quest. Javanica rice is grown in.
Ans. Indonesia
Quest. Rice inflorescence is called as
Ans. Panicle
Quest. Optimum temperature for good rice crop growth is
Ans. 30-320C
Quest. Best pH for cultivation of rice is
Ans. 4-6 pH
Quest. Sowing of paddy in April-May and harvesting in August-Sept. is called as-
Ans. Aus / Autumn / Pre kharif paddy
Quest. Sowing of paddy in June-July and harvesting in October is called as
Ans. Aman / Kharif / Aghani
Quest. Sowing of paddy in January-Feb and harvesting in April-May is called as
Ans. Boro/Summer/Spring
Quest. The best system of rice culture is
Ans. Transplanting
Quest. The tillage implement, most suitable for rice cultivation is
Ans. Power tiller
Quest. Hulling percentage of rice is
Ans. 70-75%
Quest. The gene responsible for dwarfness in rice is
Ans. Dee-gee-woo-gene
Quest. First intervarietal cross variety of rice?
Ans. Jaya (TN1 = T141)
Quest. The rice variety called ‘miracle rice’ is
Ans. IR-8
Quest. Normally rice plant is transplanted at
Ans. 21-25 days after sowing (3-4 leaf stage)
Quest. Under SRI method, rice plant is transplanted at
Ans. 10-12 DAS (Days After Sowing)
Quest. SRI denotes
Ans. System of Rice Intensification
Quest. In rice ‘Dapog seedlings’ are ready for transplanting
Ans.11-14 DAS
Quest. Dapog method is most commonly prevalent in
Ans. Philippines
Quest. The nursery area required for providing seedlings for transplanting 1 ha rice field
Ans.1000 m2 (1/10 ha)
Quest. Most prominent cropping pattern of rice in India?
Ans. Rice-Wheat
Quest. Rice prefer nitrogen uptake in
Ans. Ammonical form (NH4).
Quest. The best fertilizer for top dressing in rice?
Ans. Ammonium sulphate
Quest. The recommended dose of N, P and K for rice crop
Ans. 100:60:40 kg ha–1
Quest. For correction of iron chlorosis in rice, following spray is recommended
Ans. 1% solution of ferrous sulphate
Quest. The nitrogen fixing bacterium found on root surface of rice
Ans. Azospirillum
Quest. The most important critical stage of rice for irrigation
Ans. Tillering to flowering stage
Quest. In low land rice, fertilizer is applied in
Ans. Reduced zone only
Quest. Nitrogen use efficiency in rice is around
Ans. 30-40%
Quest. Aroma in rice is due to presence of
Ans. “Di-acetyl 1 propaline” chemical
Quest. Anaerobic environment in rice soil is responsible for gaseous loss of fertilizer nitrogen by
Ans. Denitrification
Quest. The Gall midge resistance varieties of rice is
Ans. Phalguna, Surekha, Suraksha
Quest. The Blast resistance varieties of rice is
Ans. Tulsi, IR64
Quest. The deep water rice are
Ans. Punkaj, Jagannath
Quest. Rice varieties suitable for Saline-alkaline soil are
Ans. CSR-10, CSR-13, CSR-27
Quest. Super rice variety is
Ans. Lunishree
Quest. Gas emitted from rice field is
Ans. CH4 (Methan).
Quest. Weed caused relatively more loss in rice productivity, when it is
Ans. Direct seeded
Quest. Most dominated weed species in rice field is
Ans. Echinochloa spp.
Quest. Common herbicide used in rice crop field?
Ans. Anilophos and Butachlor.
Quest. Polish percentage of rice is
Ans. 2%
Quest. Khaira disease is caused by
Ans. Zn deficiency.
Quest. Akiochi disease is caused by
Ans. H2S toxicity.
Quest. White eye of rice is caused by
Ans. Fe deficiency.
Quest. Dead heart and white ear of rice is caused by
Ans. Yellow stem borer
Quest. Killer disease of rice are
Ans. Bacterial Leaf Blight (BLB) and Tungro virus
Quest. Hydrothermal process of rice which saves vitamin B12?
Ans. Parboiling