Biodiversity & global warming
AQA GCSE Biology revision on Biodiversity & global warming. Aligned to the AQA GCSE Biology 8461 specification. This bank has 25 practice questions on this topic.
Sample questions (3 of 25)
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Question 1
Which greenhouse gas is primarily released by the decomposition of waste in landfill sites?
- A) Methane gas because organic matter decays anaerobically
- B) Nitrogen gas since oxygen is absent during process
- C) Hydrogen gas while microbes break down cellulose
- D) Oxygen gas after plants undergo rapid respiration
Show answer
Answer: Methane gas because organic matter decays anaerobically
The correct answer is methane gas because organic matter decays anaerobically. In landfill sites, bacteria break down waste without oxygen, which produces methane, a potent greenhouse gas. Nitrogen, hydrogen, and oxygen are not the primary products of this specific biological decay process.
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Question 2
What is the primary biological consequence of rising global temperatures on coral reef ecosystems?
- A) Coral bleaching due to thermal stress
- B) Algal bloom from rapid solar heating
- C) Fungal growth near coastal sediment
- D) Viral spread among marine organisms
Show answer
Answer: Coral bleaching due to thermal stress
The correct answer is coral bleaching due to thermal stress, which causes corals to expel their symbiotic algae. While algal blooms can occur due to nutrient pollution, they are distinct from the heat-induced bleaching process.
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Question 3
Which activity is a major contributor to the increase in atmospheric carbon dioxide levels?
- A) Combustion of fossil fuels for energy
- B) Absorption of light by ocean surfaces
- C) Evaporation of water from large lakes
- D) Oxidation of rocks within deep crusts
Show answer
Answer: Combustion of fossil fuels for energy
The correct answer is combustion of fossil fuels for energy, which releases stored carbon back into the atmosphere. The other processes listed either do not release carbon dioxide or involve natural cycles not driven by human activity.
Want to test yourself on the remaining cards for this topic?
22 more questions on Biodiversity & global warming — plus mistakes tracking and spaced repetition across the whole Biology spec.