The cards Question What is biomass? Tap to flip Answer The mass of living material in one or more organisms. Question What is a trophic level? Tap to flip Answer The position of an organism in a food chain diagram. Question What kind of organism does every food chain start with? Tap to flip Answer A producer, which makes the biomass that passes to consumers at higher trophic levels. Question What does a pyramid of biomass show? Tap to flip Answer A scaled diagram of the biomass present at each trophic level of a food chain. Question Give one reason why not all biomass at one trophic level passes to the next. Tap to flip Answer Any one of: respiration, parts not eaten, egestion or excretion. Question How is the percentage efficiency of biomass transfer calculated? Tap to flip Answer (Biomass in the higher trophic level ÷ biomass in the lower trophic level) × 100 Question Does biomass build up or get lost along a food chain? Tap to flip Answer It is lost between trophic levels through life processes; it does not build up. Question What is urbanisation? Tap to flip Answer An increase in the number of people living in towns and cities. Question What is deforestation? Tap to flip Answer The removal of trees, often for timber or fuel or to use the land for houses or farming. Question What is biodiversity? Tap to flip Answer The range of different living organisms (species) that live in a place. Question How do greenhouse gases trap heat in the atmosphere? Tap to flip Answer By absorbing infrared radiation. Question What is climate change? Tap to flip Answer A long-term shift in weather patterns. Question How does increased land use by humans lead to biodiversity loss? Tap to flip Answer It destroys habitats, for example through deforestation. Question Besides land use, give one way a growing human population leads to biodiversity loss. Tap to flip Answer Any one of: more waste, more pollution, or more greenhouse gas release contributing to climate change. Question What is a fertiliser? Tap to flip Answer Minerals added to the soil to help plants grow. Question What is eutrophication? Tap to flip Answer When a body of water becomes overly enriched with plant nutrients, causing excessive growth of simple plants such as algae. Question In eutrophication, what uses up the oxygen in the water and leads to biodiversity loss? Tap to flip Answer Microbes decomposing the dead plants, not the living plants themselves. Question What are indigenous species? Tap to flip Answer Species that occur naturally in an ecosystem, also called native species. Question Give one example of a human activity that harms ecosystems and biodiversity. Tap to flip Answer e.g. using peat and destroying peat bogs, causing eutrophication, or introducing non-indigenous species. Question What are ecosystem services? Tap to flip Answer The benefits that nature provides to human wellbeing and quality of life. Question When is a resource used sustainably? Tap to flip Answer When it is produced as quickly as it is removed from the environment, so it does not run out. Question What is conservation? Tap to flip Answer The process of protecting biodiversity and the environment. Question Can biodiversity be conserved on a small scale? Tap to flip Answer Yes, for example by providing habitats in gardens and urban areas. Question At which three levels can conservation measures protect biodiversity? Tap to flip Answer Species, ecosystem and genetic levels. Question What is food security? Tap to flip Answer Having reliable access to enough safe and nutritious food to meet the needs of the human population. Question What is genetic engineering? Tap to flip Answer Modifying an organism's genome by adding, removing or altering genes to introduce a desirable characteristic or remove an undesirable one. Question What is biotechnology? Tap to flip Answer Altering and using organisms to make products for human use. Question Give one factor that affects food security. Tap to flip Answer e.g. human population size, changing diets in wealthier populations, cost of agricultural inputs or environmental change. Question Give one way biotechnology can help food security. Tap to flip Answer e.g. genetic engineering to improve yields, or using microorganisms to make food. Question What is a carbon sink? Tap to flip Answer A process or system that takes more carbon from the atmosphere than it releases. Question Roughly what share of annual global CO₂ emissions do forests absorb from the atmosphere? Tap to flip Answer About one-quarter. Question What is ocean acidification? Tap to flip Answer A fall in ocean pH over a long period, mainly caused by the ocean taking up CO₂ from the atmosphere. Question Give one way high CO₂ levels harm marine biodiversity. Tap to flip Answer e.g. ocean acidification or reduced shell formation. Question Give one strategy for reducing the effect of deforestation on climate change. Tap to flip Answer e.g. protecting forests, reducing deforestation for farming, or replanting trees. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage GCSE (Years 10–11) Course GCSE Biology Unit Maintaining biodiversity and human impacts Exam boards AQA, Edexcel, OCR Tiers foundation and higher England's National Curriculum sets what is taught; the units and their order are Oak National Academy's. Flash Feed is not affiliated with Oak or any exam board.
How this deck was checked On 2026-11-02, every card was compared with its source: the lessons of Oak National Academy, a public body funded by England's Department for Education that publishes lessons for the national curriculum. Because the cards come from those lessons, no second source was sought. The comparison was done automatically, not by a teacher, so a card can still be wrong. Flash Feed is not affiliated with any source named here.
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A Biology lesson by Oak National Academy licensed under Open Government Licence (OGL)
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