The common character between Gracilaria, Laminaria, Spirogyra and Nostoc is:
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a
Presence of air bladders
b
Lack of PS-II
c
Presence of pigment chlorophyll a
d
Ability to fix nitrogen
answer is C.
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Detailed Solution
The common character between Gracilaria, Laminaria, Spirogyra and Nostoc is presence of pigment chlorophyll a. Gracilaria has chlorophyll a and d, Laminaria has Chlorophyll a and c, Spirogyra has chlorophyll a and b. Nostoc has the presence of chlorophyll a.