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Which one of the following statements is wrong?
Option: 1
Algae increase the level of dissolved oxygen in the immediate environment.
Option: 2
Algin is obtained from red algae, and carrageenan from brown algae.
Option: 3
Agar-agar is obtained from Gelidium and Gracilaria.
Option: 4
Laminaria and Sargassum are used as food.
Answers (1)
Phaeophyceae -
- The members of Phaeophyceae are commonly called as Brown algae. Ex: Ectocarpus, Dictyota, Laminaria, Sargassum, Fucus
- These are mostly found in Marine habitats.
- They are large sized and also known as Kelps (Laminaria, Macrocystis).
- Some forms are filamentous as in Ectocarpus.
- Members of this group are olive green to brown in colour
- Major pigments present are chlorophyll a, c, carotenoids and xanthophylls (fucoxanthin).
- The food is stored in the form of complex carbohydrates such as mannitol and laminarin.
- The cell wall has cellulose covered by gelatinous substance Algin. Algins are component of phycocolloids.
-
Algin is obtained from brown algae and carrageenan from red algae.
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