Biological Classification And System Of Classification Question 54
Question: Nostoc is a
[MP PMT 1999; MHCET 2007]
Options:
A) Cyanobacteria
B) Beaded bacterium
C) Bacteriophage
D) Parasite
Show Answer
Answer:
Correct Answer: A
Solution:
Nostoc is a genus of cyanobacteria or blue-green algae. The cells are arranged in beadlike chains that are clustered in a gelatinous frame.
It may be present on soil or floating on still water.
They reproduce by fragmentation. Like most blue-green algae, Nostoc comprises two pigments: blue phycocyanin and red phycoerythrin, as well as chlorophyll for oxygenic photosynthesis.
They have the ability to fix nitrogen in specialized cells called heterocysts. Thus, the correct option is ‘Cyanobacteria’
BETA
