Read the following statements and  which of them are true (T) or false (F) w.r.t role of essential elements.

A. Nitrogen is the essential nutrient required by plant in greatest amount.
B. Potassium activates various enzymes, especially catalase.
C. Manganese activates many enzymes involved in photosynthesis, respiration and nitrogen metabolism.
D. Calcium is required during the formation of mitotic spindle.

	A	B	C	D
1.	T	F	F	T
2.	T	F	T	T
3.	T	F	F	F
4.	F	F	F	T

• A

  1

• B

  2

• C

  3

• D

  4