Many enzymes of photosynthesis, respiration and nitrogen metabolism are activated by

(1) Ca⁺⁺

(2) Zn⁺⁺

(3) Mn⁺⁺

(4) Oxygen

(1) Splitting of water to liberate oxygen

(2) Transfer of electrones through z scheme

(3) Cyclic Phosphorespiration

(4) Photorespiration

1. Zn++

2. Cl-

3. Ca++

4. Mn+

1. Cupric form

2. Cuprous form

3. CuO

4. Cu

1. Cu⁺⁺

2. Fe⁺⁺

3. Cu⁺

4. Cl^-

(1) B

(2) Cl^-

(3) Mo

(4) Cu

(1) Membrane functioning, utilization of Ca++

(2) Pollen germination, uptake of Ca++

(3) Cell elongation, catalase activation

(4) Cell differentiation, carbohydrate translocation

1. Nitrogenase

2. Nitrate Reductase

3. Catalase

4. Both B and C

1. Na+

2. K+

3. Cl-

4. Mo++

1. Cl-

2. Mn++

3. Cu

4. Both A and C