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Which of the following shows the absence of chlorophyll- b?
(a)Green algae
(b)Red algae
(c)Blue-green algae
(d)Brown algae

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Important Questions on Biological Classification
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I. Cyanobacteria are referred to as blue-green algae.
II. They perform oxygenic photosynthesis in chloroplasts.
II. The red-colour of red-sea is due to the presence of a cyanobacterial species Trichodesmium erythraeum.
IV. All the cyanobacterial species can fix atmospheric in specialised cells called heterocysts.

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