Question

To understand how day and night occur on the earth, Vijaya took a torch and placed it in a position such that it acts as the sun. She took a ball and placed it in front of the torch as the earth. She changed the position of the ball with respect to the torch to replicate the revolution of the earth around the sun. She observed how the light falling on different parts of the earth changes with the change in its position with respect to the sun. Identify any four science process skills used in this experiment.​

Answer 1

Explanation:

Addition of pollutants like fertilizers and chemicals to the water bodies will cause diseases in aquatic organisms. Pollutants increase the biological oxygen demand of organisms living in water, since, the dissolved oxygen in the water reduces drastically