Question

The green scum over wet soil, old walls and stagnant pools of water is formed by which type of algae​

Answer 1

Answer:

The green scum you see over wet soil, old walls and stagnant pools of water is formed by blue-green algae. These organisms are more like bacteria than like algae, so they are now called cyanobacteria

Answer 2

Answer:

The green scum you see over wet soil, old walls and stagnant pools of water is formed by blue-green algae. These organisms are more like bacteria than like algae, so they are now called cyanobacteria.

Useful algae:

1. A gummy substance called algin, obtained from kelp, is used to thicken ice creams, cosmetics and shaving cream. It is also used in the preparation of medicines and synthetic fibres. Iodine and potassium are other substances obtained from kelp.

2. Agar, a jellylike substance, in which microorganisms and tissue are cultured, or grown in the laboratory, is made from certain red algae.