Which of the following pairs of alga and its characteristic reserve...

Fucus is a brown alga (Phaeophyceae) which contains the pigment fucoxanthin and stores food as mannitol and laminarin. Phycoerythrin is a characteristic pigment of red algae.

Polysiphonia is a red alga (Rhodophyceae) which stores food as floridean starch, not mannitol.

Dictyota is a brown alga (Phaeophyceae) and its characteristic pigment is fucoxanthin. This pair is correctly matched.

Chara is a green alga (Chlorophyceae) which stores food as starch, whereas laminarin is the reserve food of brown algae.

Answer: Dictyota - Fucoxanthin