Humans And Their Effects On The Environment
Overzicht
There are more of us than there have ever been, and each of us now uses more energy, more packaging, more water and more manufactured food than our grandparents did. Every one of those choices leaves something behind. The waste has to go somewhere, and biology is the study of what happens once it gets there: which organisms tolerate it, which ones disappear, and how a gas leaving a chimney in one country can empty a lake in another.
This lesson follows the routes by which human activity reaches living systems: what we release into water, into the air and onto land, what happens when tropical forest is cleared, and what rising carbon dioxide and methane are doing to climate. You will learn to set each of those out as a chain of causes rather than a list of words, and you will practise the skill this section of the specification asks for by name: reading an unfamiliar set of environmental measurements and deciding how much they are actually worth as evidence.
Doelstellingen
- Rapid growth in the human population and an increase in the standard of living mean that increasingly more waste is produced. Unless waste and chemical materials are properly handled, more pollution will be caused.
- Waste may pollute: water, with sewage, fertiliser or toxic chemicals; air, with smoke and gases such as sulfur dioxide, which contributes to acid rain; land, with toxic chemicals such as pesticides and herbicides, which may be washed from land into water
- Large-scale deforestation in tropical areas has led to reduction in biodiversity. Students should be able to describe the effects of deforestation.
- Levels of carbon dioxide and methane in the atmosphere are increasing, and contribute to ‘global warming’. An increase in the Earth’s temperature of only a few degrees Celsius may: cause big changes in the Earth’s climate; cause a rise in sea level; cause changes in migration patterns, eg in birds; result in changes in the distribution of species. Throughout this section, students should be able, when provided with appropriate information: to analyse and interpret scientific data concerning environmental issues; to evaluate methods used to collect environmental data and consider their validity and reliability as evidence for environmental change.
Mindmap
Dit onderwerp is in kaart gebracht zodat je ziet hoe de ideeen samenhangen.
Open de mindmap in de app
Lesnotitie
Volledige lesnotitie beschikbaar in de Green Bridge-app
Installeer de Green Bridge CBT-app op je telefoon of computer voor de volledige IGCSE-bibliotheek: examens uit voorgaande jaren, correctiemodellen, mindmaps, flashcards en audiolessen.
Lesevaluatie
Gefeliciteerd met het voltooien van de les op Humans And Their Effects On The Environment. Nu je de sleutelconcepten en ideeën, het is tijd om uw kennis op de proef te stellen. Deze sectie biedt een verscheidenheid aan oefeningen vragen die bedoeld zijn om uw begrip te vergroten en u te helpen uw begrip van de stof te peilen.
Je zult een mix van vraagtypen tegenkomen, waaronder meerkeuzevragen, korte antwoordvragen en essayvragen. Elke vraag is zorgvuldig samengesteld om verschillende aspecten van je kennis en kritisch denkvermogen te beoordelen.
Gebruik dit evaluatiegedeelte als een kans om je begrip van het onderwerp te versterken en om gebieden te identificeren waar je mogelijk extra studie nodig hebt. Laat je niet ontmoedigen door eventuele uitdagingen die je tegenkomt; beschouw ze in plaats daarvan als kansen voor groei en verbetering.
- Which gas released by burning fuels that contain sulfur is the main cause of acid rain? A. Carbon dioxide B. Methane C. Sulfur dioxide D. Nitrogen Answer: C
- Which pair of gases is increasing in the atmosphere and contributing to global warming? A. Sulfur dioxide and carbon dioxide B. Carbon dioxide and methane C. Oxygen and nitrogen D. Methane and sulfur dioxide Answer: B
- Which of these is named in the specification as a pollutant of land? A. Sewage B. Sulfur dioxide C. Herbicide D. Smoke Answer: C
- Which of these is NOT a direct effect of large-scale deforestation? A. Reduced biodiversity B. Increased soil erosion C. More frequent flooding D. A fall in atmospheric carbon dioxide Answer: D
- The area of forest in a region falls from 5.0 million hectares to 3.5 million hectares. What is the percentage decrease? A. 15% B. 30% C. 43% D. 70% Answer: B
Maak deze vragen in de app
Maak deze vragen in de app
Aanbevolen Boeken
Oefen Proefexamenvragen
Wilt u proefexamenvragen over Humans And Their Effects On The Environment oefenen? Download de Green Bridge CBT-app voor toegang tot proefexamenvragen en volledige oefentoetsen over dit onderwerp.
Download de app in de Google Playstore
Alles wat je nodig hebt om uit te blinken in JAMB, WAEC en NECO.
