Class 12 Biology Chapter 27 Notes

• Important class 12 biology chapter 27 mcqs for Intermediate part-II students.
• What is acid rain?
• What is Eutrophication? (OR) What is algal bloom?
• What is Ozone? (OR) Give the importance of ozone layer.
• What is pollutant?
• Write names of various types of pollution.
• What are the main sources of water pollution? (OR) Give main causes of water pollution.
• Important chapter 27 biology class 12 notes for Intermediate part-II students.
• Write the causes and effects of ozone depletion? (OR) Give the effects of ozone depletion on life.
• What are solid wastes and how these can be used as source of energy? (OR) Give importance of solid waste.
• What do you mean by non-renewable resources? (OR) What are renewable resources. Give examples.
• What measures should be taken for conservation of energy? (OR) How we can save energy?
• Important class 12 biology chapter 27 short questions for Intermediate part-II students.
• What is deforestation? (OR) What is afforestation? (OR) What is reforestation? (OR) What is the difference between deforestation and afforestation? (OR) Differentiate between afforestation and reforestation. (OR) What is the difference among deforestation, afforestation and reforestation?
• Define greenhouse effect.
• Describe abuses of land.
• Define soil and give its basic constituents. (OR) What is soil? (OR) What is soil? Give its basic constituents. 
• Important biology class 12 chapter 27 important short questions for Intermediate part-II students.
• Differentiate between health and disease.
• Discuss importance of forests.
• Differentiate between Population Explosion and Population Pressure. (OR) Enlist some reasons of Population Explosion in the world also describe Population Pressure. (OR) Write the reasons of world Population Explosion. (OR) What do you mean by Population Explosion and give its two causes?
• How is air important to life as a source?
• Important biology class 12 chapter 13 notes for Intermediate part-II students.
• Name two pathogenic and two congenital diseases.
• Why trees are called environmental buffers? (OR) Define environmental buffers.
• What is fossil fuel?
• How man is responsible to increase the number of endangered species?
• How Depletion and Degradation of resource occur on planet earth?

• What is acid rain?  Process through which acid fall on Earth either dissolved in rain or as microscopic dry particles is called acid rain.
• Important chapter 13 biology class 12 important short questions for Intermediate part-II students.
• What is algal bloom?  It is natural process of excessive enrichment of water with nutrients by which large amount of living organic material grows in the water.
• Why wildlife is some time also included in non-renewable resources?  Wildlife is renewable as they are replenished and never depleted. But certain factors such as over hunting, over grazing, deforestation etc. may cause the extinction of wildlife, which make it non-renewable resources.
• How tidal barrage generate electricity?  A tidal power station consists of a long barrage called tidal barrage. The difference between height of water at high and low tides causes the flow of water through this barrage, which turns its turbines that in turn drive the generator to produce electricity.
• Important chapter 13 biology class 12 exercie questions for Intermediate part-II students.
• What is nutrient cycle?  In nature, there is no such thing as waste, dead materials decay and become food for other living things. This food is consumed or decayed and becomes food again. This is the nutrient cycle. the process that supplies food to living things.
• In which sources energy are classified?  Energy resources can also be classified as inexhaustible and exhaustible. Inexhaustible resources include solar energy, falling water (hydro-power), wind, ocean thermal gradients, waves, tides, currents, geothermal energy and biomass. On the other hand, fossil fuels like coal, oil and natural gas are exhaustible sources of energy.
• What is ozone depletion? What is the cause of ozone depletion?  The decline in thickness of the ozone layer is caused by increasing level of chlorofluorocarbons (CFCs), which contains chlorine, fluorine and carbon. As CFCs rise to the atmosphere, ultraviolet rays cause chlorine to release.