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Question

Agar is obtained from which of the following algae


A

Sargassum

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B

Chondrus crispus

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C

Spirogyra

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D

Gelidium

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Solution

The correct option is D

Gelidium


The correct option is : D

Explanation of the correct option:

  1. Agar is a jelly-like material which is derived from Red Algae such as Gelidium and Gracilaria.
  2. The jelly material in algae is due to the presence of unbranched polysaccharides obtained from the cell walls of the red algae.
  3. Agar agar is used as a solidifying agent in jellies, cakes, etc.

Explanation of the incorrect options :

Option A:

Sargassum is an example of free-floating brown algae, has an inner cellulose layer and outer gelatinous coat, which is used as an emulsifying agent and a stabilizer.

Option B :

  1. Chondrus crispus commonly called Irish moss or carrageen moss is a species of red algae, that can be used for congestion.
  2. It holds anti-bacterial and anti-viral properties.

Option C :

Spirogyra are filamentous, free-floating green alga, which can be used as antibiotic, antiviral and acts as an antioxidant.

Final answer: Agar is obtained from alga Gelidium.


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