Question

Economic importance of algae ?(5mark)

Answer 1

1st - there are various species of green and brown algae that are eaten (sargassum,laminaria)

2nd - algae are the major sources of phycocolloids which have excellent water holding capacity.

3rd- they carry out major portion of photosynthesis

4th- red algae gives us carageen which is an important industrial component

5th- there are various medicinal as well as industrial applications of algae also

Answer 2

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→ Algae means "sea weeds". They are mostly primitive, eukaryotic and thalloid organisms.

→ Algae are classified into :-

1) Red Algae = mostly found in marine water

2) Brown Algae = mostly found in marine water

3) Green Algae = mostly found in fresh water


`$\textbf{Economic Importance of Red Algae}$`

→ Many red algae are edible. Rhodymenia is used as cattle food in France.

→ A number of phycocolloids are extracted from red algae for commercial purposes. Ex :- Agar is obtained from Gelidium. It is used in preparation of creams, jellies etc. and in microbiological works also.

→ These are also used in preparation of medicines.

Extracts of Corallina are used for the treatment of kidney, lungs diseases and bladder.


`$\textbf{Economic Importance of Brown Algae}$`

→ Food obtained from Laminaria saccharina I known as 'Kombu'. Kombu is rich on carbohydrates.

→ Alginates are extracted from giant brown algae which is used in preparation of sauce, soap, cream etc.

→ Sodium laminarin which is obtained from Laminaria is an effective blood anticoagulant.


`$\textbf{Economic Importance of Green Algae}$`

→ Chlorella (example of green algae) possesses a high quality of food value.

→ Chlorella yields an antibiotic chlorellin which is used again pathogens.

→ Chlorella and chlamydomonas are examples of green algae. These algae used in sewage disposal.