1. Which of the following is not a macronutrient

2. Phytotron is meant for

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

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

5. Analysis of xylem sap shows

6. The nitrogen exists as two nitrogen atoms joined by

7. Biological nitrogen fixation was discovered by

8. Oxygen scavangers present in root nodules of legumes is

9. Phosphorous is a constituent of

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

10. Presence of phosphorus

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

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

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

14. Minerals present in the soil are absorbed by

15. The enzyme involved in biological nitrogen fixation are

16. Exanthema is due to deficiency of

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

18. Insectivorous plants grow where

19. NPK denotes

20. Conversion of ammonia into nitrates through Nitrosomonas is called