Assertion is True: The vast majority of red algae (Rhodophyta) are marine, with only about 200 species found in freshwater. They are especially abundant in warmer marine waters and can be found at great depths.

Reason is False: The characteristic red color of red algae is due to the predominance of the pigment r-phycoerythrin (a type of phycobilin), not anthocyanin. Anthocyanins are water-soluble vacuolar pigments found in higher plants (like flowers and fruits) and some leaves, but they are not the primary pigments in red algae.

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