Question
List five ways in which algae are useful.
✓
Answer
Algae are useful in the following ways :
- They are the major sources of food for organisms that cannot make their own food and live in water.
- They also release and large amount of oxygen during photosynthesis.
- Algin, used for preparing ice- cream and toothpaste is obtained from kelp, an. alga.
- Agar obtained from red algae is used in the laboratory for various experiments.
- Some red algae are also used as food since they are a rich source of proteins, vitamins and minerals.
- The cell wall of diatoms contains silica and are extensively used in making metal polish, toothpaste and porcelain.
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