21. Who laid the foundation for modern irrigation engineering in India?
22. One acre is equivalent to
23. Most serious disease of sugarcane is
24. Match the following columns:
Column I (Origin)
Column II (Crop)
a. South American
1. Sorghum
b. Africa
2. Potato
c. Asia minor
3. Wheat
d. India
4. Soyabean
| Column I (Origin) | Column II (Crop) |
| a. South American | 1. Sorghum |
| b. Africa | 2. Potato |
| c. Asia minor | 3. Wheat |
| d. India | 4. Soyabean |
25. RMO-40 is a variety of
26. NARS refers to
27. Silicon is the . . . . . . . . most abundant element in the earth's crust.
28. The polish percentage in paddy is
29. Yellow Revolution was mainly achieved due to
30. India has the largest area in rice cultivation in the world, which is about
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