Biology Class 11 Chapter - 6
Prokaryotes - 15
1.
Which one of the following is a cause of mutation?
a) exposure to mutagens
b) conjugation
c) absorption of DNA
d) transduction
2.
Mutations due to genes involved in the growth limiting processes are called as?
a) stress-directed mutations
b) random mutations
c) translocations
d) point mutations
3.
Going from lag to death phase of bacteria, time taken for growth?
a) remains constant
b) increases
c) decreases
d) first increases then decreases
4.
Rhizobium bacteria are useful in?
a) carbon fixation
b) hydrogen fixation
c) nitrogen fixation
d) oxygen fixation
5.
Which one of the following bacteria are living in the root nodules of legumes?
a) E. coli
b) Rhizobium
c) V. cholera
d) S. pneumoniae
6.
Conversion of ammonia to nitrates is called as?
a) denitrification
b) ammonification
c) deamination
d) nitrification
7.
Conversion of nitrates into nitrogen is called as?
a) nitrification
b) denitrification
c) ammonification
d) deamination
8.
Carbon dioxide is produced by bacteria during?
a) reproduction
b) photosynthesis
c) conjugation
d) fermentation
9.
The product of dead organic matter is called as?
a) cud
b) bolus
c) humus
d) chyme
10.
Which one of the following are decomposers of dead organic matter?
a) humans and bacteria
b) bacteria and fungi
c) fungi and humans
d) bacteria and plants
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