Biology Class 11 Chapter - 6
Prokaryotes - 6
1.
The colour of phycocyanin is?
a) blue
b) green
c) white
d) red
2.
Cyanobacteria have introduced ___ into the ancient atmosphere?
a) oxygen
b) carbon dioxide
c) hydrogen
d) nitrogen
3.
Reproduction in cyanobacteria is?
a) sexual
b) both of these
c) asexual
d) none of these
4.
The resting stages of cyanobacterial filaments are called as?
a) endospores
b) fragments
c) akinetes
d) kinetes
5.
Fragmentation in cyanobacteria is a method of?
a) sexual reproduction
b) photosynthesis
c) respiration
d) asexual reproduction
6.
How many cyanobacteria are able to fix atmospheric nitrogen?
a) one fourth
b) one fifth
c) one sixth
d) one third
7.
Nitrogen fixation in cyanobacteria is mostly taking place in?
a) vheterocysts
b) endospores
c) cytoplasm
d) nucleus
8.
Nostoc and Anabaena are cultivated in Pakistan to?
a) increase oxygen in the atmosphere
b) clean the atmosphere
c) control the pests
d) increase soil fertility
9.
Which one of the following structure is not present in bacteria?
a) cytoplasm
b) cell wall
c) cell membrane
d) true nucleus
10.
Which one of the following structure is not present in bacteria?
a) cytoplasm
b) cell wall
c) true nucleus
d) cell membrane
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