Question

The Sargasso sea gets its name because of the presence of algae belonging to the class
A. Chlorophyceae
B. Rhodophyceae
C. Phaeophyceae
D. Xanthophycea

Answer 1

Hint: It occurs because of marine algae called Sargassum. The sargasso sea is in the gyre in the middle of the North Atlantic Ocean and it is the only sea without any coastline around it.

Complete answer:The algae are divided into three classes, they are- Chlorophyceae, Phaeophyceae, and Rhodophyceae.
1. Many other species of Porphyra, Laminaria, and Sargassum are among the species of marine algae used as food.
2. The sargasso sea is unique for its ocean water for its deep blue color.
3. The sargasso sea has an alga called Sargassum which floats on the surface of the water.
4. Sargassum comes under the class Phaeophyceae. These are brown algae found in marine habitats.
5. Algae are very useful to man in various ways through photosynthesis half of the total carbon dioxide fixation of the earth is carried out through algae. Because of their photosynthetic ability, they increase the level of dissolved oxygen from the environment they are present.
6. They are very important as primary producers in the food cycle because of the energy-rich compounds they produce. This forms the basis of the food cycle of all the aquatic animals.
7. Phaeophyceae are of simple branched, filamentous type, profusely branched form.
8. They have chlorophyll a, c, and carotenoids and xanthophylls.
9. The other genus in Phaeophyceae is ectocarpus, dictyota, fucus, etc.

So, the correct answer is “Option C”.

Note: The Chlorophyceae are the green algae and the examples are Chlamydomonas, Volvox, Ulothrix, Spirogyra, and Chara.
The Rhodophyceae are the red algae and the examples are Polysiphonia, Porphyra, Gracilaria, and Gelidium.