Question

Choose the right combination:

Column-I	Column-II
A. E. coli	I. Nif gene
B. R. meliloti	II. Digests hydrocarbon of crude oil
C. B. thuringiensis	III. Production of human insulin
D. P. putida	IV. Biological control of fungal disease
	V. Bio-insecticide

• A. A – III; B – I; C – V; D – IV
  
• B. A – I; B – II; C – III; D – IV
  
• C. A – II; B – I; C – III; D – IV
• D. A – III; B – I; C – V; D – II
  

Answer 1

The correct option is D A – III; B – I; C – V; D – II


The following are the contributions of important microbes to human walfare:

• Escherichia coli: It is used for mass scale production of human insulin.
• Rhizobium meliloti: This microbe helps in the fixation of atmospheric nitrogen. It contains nif genes which are the genes encoding enzymes involved in the fixation of atmospheric nitrogen into a form of nitrogen available to living organisms.
• Bacillus thuringiensis: This organism is used as bio-insecticides in order to control catterpillars.
• Pseudomonas putida: It is a gram negative, soil-water microbe that is widely used to digest hydrocarbons of crude oil polluting water bodies.