1. Phosphorous is a constituent of

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

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

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

4. Analysis of xylem sap shows

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

6. Biological nitrogen fixation was discovered by

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

8. Phytotron is meant for

9. The enzyme involved in biological nitrogen fixation are

10. Conversion of ammonia into nitrates through Nitrosomonas is called

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

12. NPK denotes

13. Exanthema is due to deficiency of

14. Minerals present in the soil are absorbed by

15. Which of the following is not a macronutrient

16. Oxygen scavangers present in root nodules of legumes is

17. Presence of phosphorus

18. Insectivorous plants grow where

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

20. The nitrogen exists as two nitrogen atoms joined by