Question

Algae are useful because they____________.

• A. Are large in number
• B. Purify the atmosphere
• C. Are easily available for the study of transpiration
• D. Are used as the packing material in bridge construction

Answer 1

The correct option is B Purify the atmosphere

Algae belong to the Plant kingdom and like plants only they proceed photosynthesis. They also have the ability to trap solar energy as they contain chloroplast. They also produce food and oxygen as the end product of photosynthesis. They can grow in fresh and saltwater. They can also grow on rocks and moist soil. Thus, they purify the atmosphere in any environmental condition by producing a large amount of oxygen.