Question

The discharge of excessive fertilizers etc., into ponds is responsible for which of the following effects?

• A. It increases the level of oxygen in the pond
• B. It reduces the temperature of water in the pond.
• C. It decreases the population of aquatic organisms
• D. It makes the pond water toxic for algae

Answer 1

The correct option is C

It decreases the population of aquatic organisms

When the excessive fertilizers are released into the ponds, they act as nutrients for the algae. The population of algae increases and a layer of algae forms over the surface of water. This decrease the diffusion of oxygen into water as a result, oxygen content decreases and aquatic organisms die.