Question

Explain any two harmful activities of Blue-Green algae.

Answer 1

• Heavy accumulation of blue-green algae in water bodies bring algal bloom. Algal bloom makes water unfit for domestic use. After the ** of these algae their organic matter creates rich source of food for aerobic bacteria. They decompose organic matter by consuming O2. It creates O2 deficit and causes the **** of fishes.
• Some cyanobacteria grow on buildings during rainy season and cause damage to bricks and surface coating