Daily Dosage -Paddy - Part 1 - Agronomy Important Q & A for all Competitive Exams

 Paddy-Part 1 - Agronomy  Important Q & A for all Competitive Exams

1. Origin of paddy: South east Asia/Indo Burma.

2. Botanical name of rice: Oryza sativa

3. Family of Rice: Gramineae/Poaceae

4. Chromosome number in rice: 2n=24

5. Inflorescence of rice: panicle, which has 6 stamens.

6. Orzya sativa is evolve from Oryza nivara (2n=48)

7. Oryza sativa genome : AA

8. Rice is considered as Stable food of Asia.

9. Maximum hybrid rice cultivated in China.

10. Water requirement in rice for overall growth: 1250 mm.

11. 5000 littre water requirement to produce 1 kg rice.

12. Oryza sativa has 3 varietal types:

• Indica: grown in india, also called tropical rice

• Japonica : grown in japan, also called subtropical rice

• Javanica : grown in indonasia, wild rice

13. Lodging does not occur in japonica spp of rice.

14.Rice contains about 70% carbohydrate and 6-7% protein.

15.Rice protein is called oryzein.

16.Protein percentage in rice bran 12-15%

17.Critical stage for irrigation- Booting stage.

18.Rice field submerged in 5 cm deep water.

19.Test weight of rice 25 gm and basmati rice 21gm.

20.Fruit type is caryopsis.

21.Lemma & palea is called hull.

22.Stem of rice called as clum.

23.Rice is a self pollinated crop, C3 and short day crop.

24.Climate for rice: hot and humid.

25.Rice provides about 22% of the world’s supply of calories & 17% of the proteins.

26.In kharif, dry nursery of rice gives higher yields compared to wet nursery.

27.Lysine content in rice- 4 %

28.Seed multiplication ratio: 1:80 (Varieties) , 1:100 (Hybrids)

29.Temperature for rice cultivation-

• M inimum/base : 10-12⁰C

•  Optimum : 30-32⁰C

•  Maximum : 38-40⁰C

•  Average temp : 21-37⁰C

•  Blooming temp : 26.5-29.5⁰C

•  For ripening : 20-25⁰C

•  Panicle initiation : 20-22⁰C

30.Clay loam is best for rice cultivation

31.4-6 or 5.5-6.5, both are suitable for rice cultivation.

32.CRRI : central rice research institute, cuttack ( Orissa) 23 april 1946

33.IRRI : international rice research institute, los banos, phillippines, 1960

34.Dehusked rice is called as brown rice.

35.18% silicon is found in hull of rice.

36.Rice bran oil percentage: 18-20%.

37.Fat percentage in rice: 2-2.5%.

38.Polishing percentage in rice: 2%

39.Hulling percentage in rice: 66%

40.Husk percentage in rice: 33%

41. Milling percentage in rice: 50-55%

42. Harvesting index of rice: 0.40

43.The gene responsible for dwarfness is Dee-Gee-Woo-gene.

44. IR-8 = dee-gee-woo-gene x peta.

45.IR-8 introduced in India in 1966.

46.TN-1 variety introduced in India by G. V. Ghalam from international rice research institute in 1964.

47.Jaya = TN-1 X T-141 (miracle rice).

48. Aroma in rice is due to 2-Acetyl-1 Pyrroline.

49.IW/CPE for rice crop-1.20

50.Gap filling is done in paddy field 7-10 days after transplanting.