Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 7 PCB Single Correct MCQ
Published on: August 13, 2026

What is common between the algal species, Polysiphonia, Porphyra and Gracilaria?

A
The vegetative cells have a cellulosic wall usually covered on the outside by a gelatinous coating
B
The cell wall of red algae contains mucopolysaccharides like carrageenan
C
The chloroplasts may be discoid, reticulate, cup-shaped or spiral in different species
D
Food is stored as complex carbohydrates, which may be in the form of laminarin or mannitol

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The correct answer is:
B

All of the given species belongs to red algae. Rhodophyceae are commonly known as red algae because of the predominance of red pigment called phycoerythrin. The cell wall of red algae contains carrageenan. It is a polysaccharide which is extracted from seaweeds like red edible seaweeds which is used as thickening, gelling and stabilising agent.

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