Question

List any three human activities which would lead to an increase in the carbon dioxide content of air

NCERT Class IX
Sciences - Main Course Book

Chapter 14. Natural Resources

Answer 1

List any three human activities which would lead to an increase in the carbon dioxide content on air.
Human activities which are responsible for adding carbon dioxide to the atmosphere are
1. Respiration Both plants and animals release carbon dioxide to the atmosphere as a product of respiration.
2. Decomposition Decomposition of organic wastes and dead bodies by decomposer releases carbon dioxide to the atmosphere.
3. Combustion Burning of fossil fuels, like wood, coal, petrol, gas and kerosene also releases carbon to the atmosphere.

Answer 2

1. Burning of fuels in various processes like heating cooking transportation and industry.

2. Human induced forest fires.

3. The process of differentiation includes the cutting down of trees. this decreases the update of carbon dioxide for photosynthesis eventually the content of carbon dioxide increase.