1. Organic form               
2. Inorganic form
3. Precipitated form
4. both a & b

A. Gypsum

B. Dolomite    

C. Chalcopyrite

D. Pyrite

A. SO₄^-2

B. SO₂                        

C. SO₃

D. S

A. CaCO3

B. CaO

C. Fe₂O₃

D. None of these

A. SO₂

B. H₂S

C. SO₃

D. H₂SO₄

A. Mg

B. S

C. Ca

D. both a &c

1. 100 times decreases
2. 1000 times decreases
3. 10 times decreases
4. 100 times increases

1. increase Zn availability
2. decrease Zn availability
3. has no effect
4. none of these

A. visual plant deficiency symptoms

B. soil analysis

C. plant analysis

D. all the above

A. reduction in mass flow

B. reduced rate of diffusion

C. reduced mineralization

D. all the above