The common character between Gracilaria, Laminaria, Spirogyra and Nostoc is:

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Presence of air bladders

Lack of PS-II

Presence of pigment chlorophyll a

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.

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