Solved Examples on Microbes in Human Welfare

Question1: In alcohol fermentation [CBSE PMT 2003]

(a) Triose phosphate is the electron donor while acetaldehyde is the electron acceptor

(b) Triose phosphate is the electron donor while pyruvic acid is the electron donor

(c) There is no electron donor

(d) Oxygen is the electron acceptor

Answer: a

Solution:

In alcohol fermentation triose phosphate is the electron donor while acetaldehyde is the electron acceptor.

Question2: Two bacteria found to be very useful in genetic engineering experiment are [CBSE PMT 1998]

(a) Nitrosomonas and klebsiella                               

(b) Escherichia and Agrobacterium

(c) Nitrobacter and Azotobacter                                

(d) Rhizobium and Diplococcus

Answer: b

Solution:

Two bacteria found to be very useful in genetic engineering experiment are Escherichia and Agrobacterium.

Question3: Which of the following groups of plants are highly useful in increasing soil fertility [CBSE PMT 1993]

(a) Red algae         

(b) Fungi     

(c) Bacteria

(d) Bryophytes

Answer: c

Solution:

Bacteria are highly useful in increasing soil fertility.