1. Conversion of ammonia into nitrates through Nitrosomonas is called

2. Toxicity of which element leads to the appearance of brown spots on leaves

3. Exanthema is due to deficiency of

4. Analysis of xylem sap shows

5. Which element is required for opening and closing of stomata?

6. Which one of the following organism help in absorption of phosphorus from soil by plants

7. Which one of the following is not a micronutrient?

8. NPK denotes

9. Insectivorous plants grow where

10. The requirement of micro nutrient are always low if the concentration increases it leads to

11. The enzyme involved in biological nitrogen fixation are

12. Phytotron is meant for

13. Biological nitrogen fixation was discovered by

14. Oxygen scavangers present in root nodules of legumes is

15. In cabbages, ‘Whiptail’ is a characteristic deficiency disease. It is caused by the deficiency of

16. Which of the following is not a macronutrient

17. Minerals present in the soil are absorbed by

18. Phosphorous is a constituent of

• A. Cell membrane
• B. Nucleic acids
• C. cellwall
• D. chlorophyll
  

19. Presence of phosphorus

20. The nitrogen exists as two nitrogen atoms joined by