Question 1:

Greenhouse gases (for example carbon dioxide) trap heat in the atmosphere. This effect increases global temperatures.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 2:

Greenhouse gases trap heat in the atmosphere. Common examples include carbon dioxide, methane, and water vapour.

Oxygen does not trap heat significantly and is not considered a greenhouse gas.

✅ Correct answer: B. Oxygen

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 3:

Greenhouse gases trap heat from the Sun, keeping the Earth warmer than it would be otherwise. Without them, most of that heat would escape back into space.

The average temperature of Earth would drop significantly — well below freezing (currently ~15°C without greenhouse gases would be about -18°C).

This means it would decrease to below 0°C.

✅ Correct answer: D. Decrease to below 0°C

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 4:

The graph shows the trend temperature in 1980 (red line) at about 0.2 °C, and in 2020 at about 1.0 °C. This is an increase of about 0.8 °C.

✅ Correct answer: D. 0.8 °C higher

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 5:

All of the listed problems are linked to global warming:

• Extreme weather events (e.g., stronger hurricanes) due to warmer oceans and more energy in the climate system.

• Higher sea levels from melting glaciers/ice sheets and thermal expansion of seawater.

• Retreat of glaciers due to rising temperatures.

✅ Correct answer: D. All of the above

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 6:

The enhanced greenhouse effect is caused by human activities that increase greenhouse gas emissions (e.g., CO₂, methane).

• A. Deforestation → reduces CO₂ absorption by trees, contributes to enhanced greenhouse effect ✅ (contributes)

• B. Producing electricity using wind farms → renewable source, no greenhouse gas emissions ❌ (does NOT contribute)

• C. Increasing cattle herds → cattle produce methane (a greenhouse gas) ✅ (contributes)

• D. Coal-fired power stations → release large amounts of CO₂ ✅ (contributes)

The activity that would NOT have contributed: B. Producing electricity using wind farms

✅ Correct answer: B

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 7:

All the listed effects — loss of habitat, increased flooding, increased atmospheric CO₂, and extinction of species — are direct consequences of deforestation.

• A. Deforestation ✅

  • Loss of habitat (trees removed)

  • Increased flooding (less tree roots to absorb water)

  • Increased CO₂ (trees no longer absorb CO₂; burning releases it)

  • Extinction of species (habitat destruction)

• B. Hole in ozone layer → causes increased UV radiation, not flooding or CO₂ rise directly

• C. Increase in sewage output → causes water pollution, eutrophication, not increased CO₂ or flooding directly

• D. Acid rain → damages forests and aquatic life, but does not directly cause these four together

✅ Correct answer: A. deforestation

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 8:

Let’s reason step by step:

• Untreated sewage entering a river adds organic waste and bacteria (including decomposers).

• Immediately downstream:

  • Bacteria increase rapidly because of the organic matter.

  • Bacteria use up oxygen during decomposition → oxygen decreases.

  • High organic pollution and low oxygen kill sensitive species (e.g., fish, insects) → biodiversity decreases.

Looking at the options:

✅ Correct answer: C

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 9:

Let’s recall the process of eutrophication:

1. Excess nitrogen/phosphorus from sewage or fertilizers enters water.

2. Causes algal bloom (algae grow rapidly).

3. Algae die and are decomposed by bacteria.

4. Bacteria use up oxygen in the water.

5. Lack of oxygen → fish and other aquatic animals die.

• A. Greater rate of photosynthesis of riverside plants → Not a direct result of eutrophication in the water (riverside plants aren’t affected the same way).

• B. Fish dying through lack of oxygen ✅ – This is a major consequence.

• C. Increased biodiversity → False, eutrophication decreases biodiversity.

• D. Decrease populations of decomposers → False, decomposer populations increase (bacteria feeding on dead algae).

✅ Correct answer: B. Fish dying through lack of oxygen

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 10:

Sulfur dioxide (SO₂) is released primarily from burning fossil fuels (especially coal) and industrial processes.
It reacts with water vapor in the atmosphere to form sulfuric acid, which falls as acid rain.

• A. Production of acid rain ✅ – Direct consequence of SO₂.

• B. Eutrophication → Caused by excess nitrogen/phosphorus, not SO₂.

• C. Global warming → Caused by greenhouse gases (CO₂, methane), not primarily SO₂.

• D. Production of ozone → Ozone (ground-level) is formed from NOx and VOCs, not SO₂.

✅ Correct answer: A. Production of acid rain

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.