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NEET Biology Video Course

Environmental Issues(Code RIE)

Class XI 11 Biology Environmental Issue- Part 1 (Pollutants) RIE1

  • Classification of Pollutants

  • Persistence-persist in environment after release

  • Primary pollutants

  • Secondary pollutants

  • Existence: according to existence in nature

  • Quantitative pollutants

  • Qualitative pollutants

  • Natural disposal

  • Biodegradable pollutants: quickly degraded

  • Non biodegradable pollutants

Class XI 11 Biology Environmental Issue- Part 2(Pollution source) RIE2

  • Point source

  • Line or mobile source

  • Area source:  industrial estates and mining

  • Diffuse sources:

Class XI 11 Biology Environmental Issue- Part 3(Types of pollution) RIE3

  • Pollution is of 5 main types:

  • Atmospheric or air pollution

  • Hydrospheric or water pollution

  • Lithospheric or land pollution

  • Radioactive pollution

  • Noise or sound pollution

Class XI 11 Biology Environmental Issue- Part 4(Air Pollution) RIE4

  • Causes

  • Human activities: industrialization, urbanisation etc.

  • Nature

  • Sources of air pollution: fossil fuels and industries

  • Types of air pollution

  • Point or stationary sources

  • Line or mobile sources:  automobiles

  • Area sources: towns and cities

Class XI 11 Biology Environmental Issue- Part 5(Common air pollutants and their effects) RIE5

  • Gaseous pollutants

  • Oxides of carbon

  • Carbon monoxide

  • Carbon dioxide

  • Oxides of nitrogen

  • Oxides of sulphur

  • Hydrocarbons

Class XI 11 Biology Environmental Issue- Part 6 (Photochemical oxidants) RIE6

  • PAN

  • Ozone

  • Smog

  • Classical smog

  • Photochemical smog

  • Aldehydes

  • Florides

Class XI 11 Biology Environmental Issue- Part 7(Particulate pollutants) RIE7

  • Sources

  • Types

  • Dusts

  • Effects

  • Mists

  • Aerosols

  • CFC

  • Nitrogen and sulphur oxides

  • PCBs

  • Tobacco smoke

  • Pollen, spores, cysts and bacteria

  • Radioactive pollutants

Class XI 11 Biology Environmental Issue- Part 8 (Air Pollution Control) RIE8

  • Control of air pollution: 3 types of steps can be taken

  • Separation of pollutants

  • Growing trees

  • Use of good quality fuel

Class XI 11 Biology Environmental Issue- Part 9 (Control of particulate matter) RIE9

  • Gravity settling tanks

  • Bag filters

  • Electrostatic precipitator  

  • Cyclonic separators

  • Trajectory separators

  • Catalytic converters 

Class XI 11 Biology Environmental Issue- Part 10 (Control of gaseous pollutants) RIE10

  • Combution method

  • Absorption method

  • Adsorption technique

  • Avoidance of pollutants

  • Conversion of pollutants

Class XI 11 Biology Environmental Issue- Part 11 (Controlling vehicular air pollution in Delhi: a case study) RIE11

  • New government auto fuel policy

  • Acid Rains

  • Wet deposition: rain, snow and fog

  • Dry deposition

Class XI 11 Biology Environmental Issue- Part 12 (Water Pollution:) RIE12

  • Physical pollutants:  heat and oil spills

  • Chemical pollutant

  • Biological pollutants: pathogens

  • Sources Of Water Pollution

  • Natural sources

  • Anthropogenic

  • Surface(Inland) Water Pollution

  • Types of sources of water pollution

  • Point source:  municipal and industrial discharge pipes

  • Diffusion source

  • Types of water pollutants

  • Organic wastes(community waste waters)

  • Biodegradation

Class XI 11 Biology Environmental Issue- Part 13 (Determination of quality of waste water by BOD) RIE13

  • Eutrophication.

  • Biomagnification

Class XI 11 Biology Environmental Issue- Part 14 (Radioactive wastes) RIE14

  • Solid particles

  • Heat

Class XI 11 Biology Environmental Issue- Part 15 (Thermal Pollution-) RIE15

  • Effects

  • Control

  • Cooling ponds

  • Spray towers

  • Underground Water Pollution

  • Marine Water Pollution​

Class XI 11 Biology Environmental Issue- Part 16 (Control of Water Pollution) RIE16

  • Integrated waste water management

  • Natural Depollution
    Treatment Of Waste Water

  • Treatment of sewage: 3 steps

  • Primary treatment

  • Secondary treatment:2 ways

  • Anoxic secondary water treatment

  • Aerobic secondary water treatment: 2 Ways

  • Trickling filter method

  • Activated sludge method

  • Tertiary treatment

  • Treatment of Industrial Effluents

Class XI 11 Biology Environmental Issue- Part 17 (Soil and Landscape Pollution) RIE17

  • Types of soil pollutants (sources of soil pollution)

  • Chemicals- like industrial waste

  • Pesticides-from crops

  • Fertilisers and manures

  • Radioactive materials-from mining and uranium processing

  • Discarded materials-  of domestic wastes

  • Effects of soil pollution-

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