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Cyanobacteria, such as Nostoc, can proliferate extensively, causing water blooms. Sargassum, a type of brown algae, contains chlorophyll a, chlorophyll c, carotenoids, xanthophyll, and the distinctive brown pigment fucoxanthin. Basidiomycetes include familiar forms like mushrooms, bracket fungi, and puffballs. In Spirogyra, the gametes are non-motile, equal in size, and exhibit amoeboid motion. Which of the following statements is accurate?

1. Algae have a well-defined cell wall made up of cellulose, galactans, and mannans.
2. Fucus stores its food reserves in the form of mannitol.
3. The classification of algae is based on the pigments they contain, such as phycoerythrin in Rhodophyceae, chlorophyll a and b in Chlorophyceae, and fucoxanthin in Phaeophyceae.
4. Ulothrix is a filamentous green alga found in freshwater and marine environments, reproducing vegetatively by fragmentation, asexually through resting spores and motile spores, and sexually via biflagellate gametes.

Correct answer: The classification of algae is based on the pigments they contain, such as phycoerythrin in Rhodophyceae, chlorophyll a and b in Chlorophyceae, and fucoxanthin in Phaeophyceae.

Solution

Option C is correct because algae are classified based on the pigments they contain, such as phycoerythrin in Rhodophyceae, chlorophyll a and b in Chlorophyceae, and fucoxanthin in Phaeophyceae. This classification is a fundamental concept in the study of algae.

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