BiologyChapter 15: Ecology
Pollution and Climate
Air: SO2, NOx, smog, acid rain named; damage to lichens and limestone.
Learning objectives
- Explain pollution and climate in clear biological language.
- Distinguish 1. eutrophication steps from 2. climate.
- Use the key terms to answer a short Federal Board exam question.
Definition
Air: SO2, NOx, smog, acid rain named; damage to lichens and limestone. Water: sewage BOD named (oxygen used by decay), eutrophication: extra NP -> algal bloom -> death -> O2 crash -> fish kill. Plastic: persistent. Climate: extra greenhouse gases (CO2, CH4 named) trap heat; ice, sea level, weather extremes as school effects. Ozone hole: CFCs named as a different story (UV). These are causes and effects, not industrial emission how-to. Lichens are classic examples of mutualism and are sensitive bioindicators of air quality. Their slow growth and ability to colonise bare rock make them ecological pioneers in primary succession.
Important terms
- POLLUTION AND CLIMATE
- Air: SO2, NOx, smog, acid rain named; damage to lichens and limestone.
- 1. EUTROPHICATION STEPS
- Nutrients in.
- 2. CLIMATE
- Greenhouse is a blanket idea.
Overview
Water, air, heat:
Eutrophication Steps
Nutrients in. Algae boom. Light blocked. Algae die. Decomposers use O2. Fish die. Source: farm run-off, sewage named as policy, not a sabotage method. Excess NP from fertiliser or sewage → algal bloom → blocks light → algae die → decomposers multiply → O₂ depleted → fish and invertebrates die.
Examples BOD high = bad · Nitrate in water named · No bloom how-to
Climate
Greenhouse is a blanket idea. Burn fossil + deforestation. Methane from wetlands/ruminants named. Mitigation: less burn, more trees as slogans. Not a geoengineering protocol. Greenhouse gases (CO₂, CH₄, N₂O) trap infrared radiation. Fossil fuel burning and deforestation increase CO₂. Effects: warming, ice melt, sea level rise, extreme weather.
Examples Ozone hole != climate, if the book splits them · UV vs heat · Acid rain: SO2
WHAT — POLLUTION AND CLIMATE
Air: SO2, NOx, smog, acid rain named; damage to lichens and limestone. Water: sewage BOD named (oxygen used by decay), eutrophication: extra NP -> algal bloom -> death -> O2 crash -> fish kill. Plastic: persistent. Climate: extra greenhouse gases (CO2, CH4 named) trap heat; ice, sea level, weather extremes as school effects. Ozone hole: CFCs named as a different story (UV). These are causes and effects, not industrial emission how-to. Lichens are classic examples of mutualism and are sensitive bioindicators of air quality. Their slow growth and ability to colonise bare rock make them ecological pioneers in primary succession.
WHY — Why this topic matters
POLLUTION AND CLIMATE is an independent FBISE learning unit because students must connect its structures and processes with their biological functions and examples.
HOW — How it works
EUTROPHICATION STEPS: Nutrients in. Algae boom. Light blocked. Algae die. Decomposers use O2. Fish die. Source: farm run-off, sewage named as policy, not a sabotage method. Excess NP from fertiliser or sewage → algal bloom → blocks light → algae die → decomposers multiply → O₂ depleted → fish and invertebrates die. Examples: BOD high = bad; Nitrate in water named; No bloom how-to. CLIMATE: Greenhouse is a blanket idea. Burn fossil + deforestation. Methane from wetlands/ruminants named. Mitigation: less burn, more trees as slogans. Not a geoengineering protocol. Greenhouse gases (CO₂, CH₄, N₂O) trap infrared radiation. Fossil fuel burning and deforestation increase CO₂. Effects: warming, ice melt, sea level rise, extreme weather. Examples: Ozone hole != climate, if the book splits them; UV vs heat; Acid rain: SO2. Worked eutrophication: Extra nitrate/phosphate enter. Algae multiply. Death and decay use O2. Aquatic animals suffocate.
Worked example
- Worked eutrophication:
- Extra nitrate/phosphate enter.
- Algae multiply.
- Death and decay use O2.
- Aquatic animals suffocate.
In simple words
Effects and prevention slogans. No emission or bloom how-to.
Key points
- eutrophication steps
- greenhouse named gases
- NP -> bloom -> O2 crash
- CO2 + CH4
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Pollution and Climate
Sticky Notes · Quick Revision
Core Idea
- Air: SO2, NOx, smog, acid rain named; damage to lichens and limestone. Water: sewage BOD named (oxygen used by decay), eutrophication: extra NP -> algal bloom -> death -> O2 crash -> fish kill. Plastic: persistent. Climate: extra greenhouse gases (CO2, CH4 named) trap heat; ice, sea level, weather extremes as school effects. Ozone hole: CFCs named as a different story (UV). These are causes and effects, not industrial emission how-to. Lichens are classic examples of mutualism and are sensitive bioindicators of air quality. Their slow growth and ability to colonise bare rock make them ecological pioneers in primary succession.
1. EUTROPHICATION STEPS
- Nutrients in. Algae boom. Light blocked. Algae die. Decomposers use O2. Fish die. Source: farm run-off, sewage named as policy, not a sabotage method. Excess NP from fertiliser or sewage → algal bloom → blocks light → algae die → decomposers multiply → O₂ depleted → fish and invertebrates die.
2. CLIMATE
- Greenhouse is a blanket idea. Burn fossil + deforestation. Methane from wetlands/ruminants named. Mitigation: less burn, more trees as slogans. Not a geoengineering protocol. Greenhouse gases (CO₂, CH₄, N₂O) trap infrared radiation. Fossil fuel burning and deforestation increase CO₂. Effects: warming, ice melt, sea level rise, extreme weather.
Exam Example
- Worked eutrophication:
- Extra nitrate/phosphate enter.
- Algae multiply.
- Death and decay use O2.
- Aquatic animals suffocate.
Common Misconception
- Do not treat 1. EUTROPHICATION STEPS and 2. CLIMATE as the same idea; each explains a different part of the topic.
FBISE Exam Check
- Define pollution and climate, explain the two key parts, and use the correct biological terms.
- Exam reminder: Worked eutrophication: Extra nitrate/phosphate enter. Algae multiply. Death and decay use O2. Aquatic animals suffocate.
60-second revision
- Air: SO2, NOx, smog, acid rain named; damage to lichens and limestone.
- 1. EUTROPHICATION STEPS: Nutrients in.
- 2. CLIMATE: Greenhouse is a blanket idea.
- Exam reminder: Worked eutrophication: Extra nitrate/phosphate enter. Algae multiply. Death and decay use O2. Aquatic animals suffocate.
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