Water Testing

Read the following passage and answer the next five questions:

Agricultural runoff, sewage, and industrial effluents are major causes of the deterioration of water quality in lakes and ponds. Productivity of lakes and ponds (for example, algal bloom and phytoplankton bloom) increases manifold due to agricultural runoff as well as due to excess inputs of nutrients including limiting nutrients, but this continuous increased productivity leads to the death of lakes and ponds. The dissolved oxygen BOD, temperature, turbidity, and salinity are important parameters of water quality in a lake and change naturally on a day and night basis as well as a seasonal basis. However, anthropogenic inputs change these parameters abruptly and adversely impact the water quality of the lakes. As a result, water in lakes and ponds does not remain fit for human consumption as well as for livestock. Immediate attention and affirmative actions are needed to protect lakes and ponds in our environment.