Ecosystem Dynamics, Functioning, and Resilience - Ecosystems are dynamic in nature; their characteristics can vary over time. Disruptions to any physical or biological component of an ecosystem can lead to shifts in all its populations.

State any two precautions that will help to avoid choking of drains.

Name two activities which lead to the formation of sewage.

Name the kind of ‘growths’ in water that lead to a depletion of the oxygen dissolved in it.

Name two of the main diseases that can be caused by drinking contaminated water.

Mention any three purposes for which distilled water is suitable? 
 

Thermal pollution of water leads to the death of biotic life. Explain. 

Which of the following gases is the most unsuitable for filling up weather observation balloons? 

Mention different types of pollutants.

Mention the causes for water pollution.

Name the inert gas which is used for filling weather observation balloons.

Which of the following is a noble gas? 

Ozone present in the troposphere is a major pollutant. However, ozone formation in aqua purifiers makes drinking water pure and safe. Explain.

How are bicarbonates added to water? How can they be removed by boiling? Give equations.

Which of the following processes is not associated with the formation of metal nitrates in soil?

Identify the component which when present in the troposphere is a pollutant and when present in upper layers of atmosphere is a protector of life.

How do fertilizers cause water pollution?

What are the effects of drinking water contaminated with chemicals?

Water containing microorganisms can cause heart-related diseases.

Polluted air affects only plants.

Increase in carbon dioxide and methane in the atmosphere can lead to: