Phaeophyceae (brown algae) possess chlorophyll a, c, and fucoxanthin, store food as mannitol and laminarin, have cell walls made of cellulose and algin, and reproduce asexually via biflagellate zoospores and sexually via gametes. Examples include Ectocarpus, Dictyota, Laminaria, Sargassum, and Fucus.
Phaeophyceae (brown algae) possess chlorophyll a, c, and fucoxanthin, store food as mannitol and laminarin, have cell walls made of cellulose and algin, and reproduce asexually via biflagellate zoospores and sexually via gametes. Examples include Ectocarpus, Dictyota, Laminaria, Sargassum, and Fucus.
| Subject | Phaeophyceae (brown algae) |
|---|---|
| Q1 | chlorophyll types |
| Q1 Answer | a, c, carotenoids, (xanthophylls) fucoxanthin |
| Q2 | food storage |
| Q2 Answer | mannitol and laminarin (carbohydrates) |
| Q3 | cell wall |
| Q3 Answer | cellulose + algin |
| Q4 | structure |
| Q4 Answer | holdfast (attaches algae), stipe (stalk), frond (leaflike) |
| Q5 | asexual reproduction |
| Q5 Answer | pear shaped biflagellate zoospores with 2 unequal lateral flagella |
| Q6 | sexual reproduction |
| Q6 Answer | pyriform (pear shaped) gametes, fertilisation may take place within water or oogonium |
| Q7 | examples |
| Q7 Answer | Ectocarpus, Dictyota, Laminaria, Sargassum and Fucus |
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