Question

Which of the following groups of algae belongs to class Rhodophyceae?

• A. Laminaria, Fucus, Porphyra, Volvox
• B. Gelidium, Porphyra, Dictyota, Fucus
• C. Gracilaria, Gelidium, Porphyra, Polysiphonia
• D. Volvox, Spirogyra, Ulothrix, Sargassum

Answer 1

Answer: (C)

Gracilaria, Gelidium, Porphyra, Polysiphonia

Answer 2

Red algae are eukaryotic autotrophs with chl-$a$ and $d$, phycobilins as pigments, floridean starch as food reserve and abundant phycocolloids (like agar, carrageenin, funori) but they lack flagellate cells. They are mostly marine. Common red algae are Gracilaria, Gelidium, Porphyra, Polysiphonia, Batrachospermum, Chondrus, etc