Which of the following increase the fertility of soil ?
A. Lactobacillus bacteria B. Rhizobium bacteria C. Spirogyra algae D. Blue-green algae
(a) A and B (b) B and C (c) A and D (d) B and D
Match the micro-organisms in column A with their action in column B:
(i) Bacteria (a) Fixing nitrogen
(ii) Rhizobium (b) Setting of curd
(iii) Lactobacillus (c) Baking of bread
(iv) Yeast (d) Causing malaria
(v) A protozoan (e) Causing cholera
(vi) A virus (f) Causing AIDS
(vii) Penicillium (g) Producing antibiotics
Which of the following statements are correct ? (i) pyruvate can be converted into ethanol and carbon dioxide by yeast (ii) fermentation takes place in the case of aerobic bacteria (iii) fermentation takes place in mitochondria (iv) fermentation is a form of anaerobic respiration (a) (i) and (iii) (b) (ii) and (iv) (c) (i) and (iv) (d) (ii) and (iii)