Azolla which fixes nitrogen in rice field is__________________?

Related Mcqs:

1. Preferable form of nitrogen for rice under submerged soil conditions is ____________?

   A. NH4
   B. NO3
   C. NO2
   D. All of these

   Submitted by: Muhammad Rehan

2. Foliar application of nitrogen means applying nitrogen in solution form to___________________?

   A. Whole plant
   B. Leaves
   C. Stem only
   D. Flowers only

3. Yield losses of rice crop due to weed infestation are___________________?

   A. 10-20%
   B. 5-15%
   C. 20-50%
   D. 20-60%

4. The seed dormancy of rice seed can be broken by putting into the oven at____________________?

   A. 50°c for 5 hrs
   B. 53°c for 6 hrs
   C. 45°c for 6 hrs
   D. none of the above

5. Better crop establishment especially for direct seeded rice can be obtained by using________________?

   A. High density grain
   B. Low density grain
   C. Both a & b
   D. None of the above

6. Vigor index of seedings in rice can be determined on___________________?

   A. Quantitative basis
   B. Qualitative basis
   C. Both a & b
   D. None of the above

7. A crop grown on residual moisture after harvesting rice is called__________________?

   A. Barani crop
   B. Dubari crop
   C. Ratoon crop
   D. Sure crop

8. A crop grown on residual moisture after harvesting rice is called__________________?

   A. Barani crop
   B. Dubari crop
   C. Ratoon crop
   D. Sure crop

9. In rice, high silicon content, in shoot confers resistance to_________________?

   A. Leaf borer
   B. Stem borer
   C. Root borer
   D. All the above

10. Abnormal seeding growth in rice may be due to_________________?

    A. Intrinsic Mechanism
    B. Lack of integrity in seed cells
    C. Endogenous inhibitors
    D. Al the above