Question

define algal bloom for class 7​

Answer 1

Answer:

An algal bloom is a kind of algae who increases their population rapidly. They mainly live in freshwater or marine water systems and they are mainly recognised by the discoloration in the water with the help of their pigments. The term algae means a class which contains many types of aquatic photosynthetic organisms both microscopic and macroscopic in nature. As algal bloom is one of the rapid growing microscopic algae i.e they are unicellular in nature and one of the most common macroscopic algae is Kelp forest.

Algal blooms are formed due to various nutrients like nitrogen, phosphorus which enters from various fertilizers into the aquatic system and there they form algal blooms. They cause various effects on ecosystems like blocking of sunlight, depletion of oxygen level in water, secreting toxic material in water, etc. Due to all these harmful effects most of the time they lead to depletion of aquatic organisms.

Answer 2

Answer:

The green, slimy patches that grow in moist areas or stagnant water are called algae. An algal bloom or marine bloom or water bloom is a rapid increase in the population of algae in an aquatic system. Algal blooms may occur in freshwater as well as the marine environment.

Hope it helps