Biological Classification And System Of Classification Question 77
Question: Which species of Nostoc produces endospores
Options:
A) Nostoc microscopilum
B) Nostoc commune
C) Both (a) and (b)
D) None
Show Answer
Answer:
Correct Answer: C
Solution:
Very few organisms are able to fix atmospheric nitrogen, among which the important ones are cyanobacteria. Nitrogen fixation cyanobacteria occur in specialised cells called heterocysts.
Cyanobacteria are seen in a variety of associations with bryophytes. Nostoc, cyanobacterium occurs in symbiotic association with hornwort Anthoceros. Within a hornwort thallus, there are Nostoc cavities which hold Nostoc cells.
BETA
