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soil."},{"text":"The food chain around them.","correct":false,"explanation":"An ecosystem includes more than other organisms: it also contains the non-living environment, such as water, soil, temperature and light. Calling it the food chain excludes important physical factors."},{"text":"The predators around them.","correct":false,"explanation":"Predators are living parts of an ecosystem, not the complete non-living component. The correct answer is the non-living environment, including factors such as rainfall, soil and temperature."},{"text":"The plants around them.","correct":false,"explanation":"Plants are biotic components, so they cannot represent what must be included besides living organisms. Ecosystems also contain the non-living environment around those organisms."}]},{"id":"49e3a003-3fee-4dc0-ba52-8c5819b883a6","cardType":"cloze","points":null,"front":"A [ ] is the place where an organism lives, such as a pond edge or tree canopy.","back":"A habitat is the place where an organism lives, such as a pond edge or tree canopy.","mcqOptions":[{"text":"habitat","correct":true,"explanation":"A habitat is the specific place where an organism lives. A pond edge and a tree canopy are examples because they provide the conditions and resources organisms need."},{"text":"population","correct":false,"explanation":"A population is all organisms of one species in an area, not the place where an organism lives. The correct term for that place is habitat."},{"text":"community","correct":false,"explanation":"A community consists of different populations living together, rather than being a physical place. The place where an organism lives is its habitat."},{"text":"ecosystem","correct":false,"explanation":"An ecosystem includes living organisms and their non-living environment, so it is broader than one organism’s living place. The correct term here is habitat."}]},{"id":"1697615d-3daa-41c6-96aa-6072d97f7965","cardType":"cloze","points":null,"front":"A population is all organisms of [ ] in an area; a community is all the different [ ] living together.","back":"A population is all organisms of one species in an area; a community is all the different populations living together.","mcqOptions":[{"text":"A population is all organisms of one species in an area; a community is all the different populations living together.","correct":true,"explanation":"A population contains organisms of one species in an area, while a community contains all the different populations living together in that area."},{"text":"A population is all organisms of different species in an area; a community is all the different populations living together.","correct":false,"explanation":"A population is not made up of every species in an area; that describes a community. A community contains different populations, so the first term must be one species."},{"text":"A population is all organisms of one habitat in an area; a community is all the different species living together.","correct":false,"explanation":"A population refers to organisms of one species, not one habitat. A community is made up of different populations living together, so replacing populations with species is incorrect."},{"text":"A population is all organisms of one species in an area; a community is all the different organisms living together.","correct":false,"explanation":"A community contains different populations, not one population. The first definition also needs one species, because a population is the organisms of one species in an area."}]},{"id":"4ffa3efb-230d-4ec5-a42b-a1727f8a8e56","cardType":"basic","points":1,"front":"In a pond ecosystem, is rainfall abiotic or biotic?","back":"Abiotic.","mcqOptions":[{"text":"Abiotic.","correct":true,"explanation":"Rainfall is a non-living physical factor in a pond ecosystem, so it is abiotic. Biotic factors are living organisms such as plants, animals and microorganisms."},{"text":"Biotic.","correct":false,"explanation":"Rainfall contains water but is not itself a living organism, so it is abiotic. Biotic factors include living things such as algae, fish and bacteria."},{"text":"Producer.","correct":false,"explanation":"Rainfall is not classified as a producer because producers are living organisms that make food, usually through photosynthesis. Rainfall is a non-living, abiotic factor."},{"text":"Consumer.","correct":false,"explanation":"Rainfall affects the ecosystem but is not a consumer, since it does not eat other organisms. Its non-living nature makes it an abiotic factor."}]},{"id":"4a989a8c-e392-4a03-a673-4a3eb8b4b3fc","cardType":"basic","points":2,"front":"Why are dog walkers in a pond ecosystem biotic?","back":"They are living organisms.","mcqOptions":[{"text":"They are living organisms.","correct":true,"explanation":"Dog walkers are humans, and humans are living organisms. Although they are not a natural part of the pond community, their presence still makes them biotic."},{"text":"They are non-living factors.","correct":false,"explanation":"Dog walkers can affect a pond, but their effect on the ecosystem does not define them as abiotic. They are biotic because humans are living organisms."},{"text":"They are physical conditions.","correct":false,"explanation":"Dog walkers may influence animals, plants or habitats, but they are not themselves environmental conditions. They are biotic because they are living organisms."},{"text":"They are environmental changes.","correct":false,"explanation":"Human activity can cause disturbance, but disturbance describes an effect rather than what dog walkers are. Their classification is biotic because they are living organisms."}]},{"id":"68c17e5f-3f8a-4a4d-afa8-4a47e60993bd","cardType":"cloze","points":null,"front":"[ ] means day-to-day atmospheric conditions; climate is average weather over about [ ].","back":"Weather means day-to-day atmospheric conditions; climate is average weather over about 30 years.","mcqOptions":[{"text":"Weather means day-to-day atmospheric conditions; climate is average weather over about 30 years.","correct":true,"explanation":"Weather describes day-to-day atmospheric conditions, whereas climate is the average pattern of weather measured over a long period, conventionally about 30 years."},{"text":"Climate means day-to-day atmospheric conditions; weather is average weather over about 30 years.","correct":false,"explanation":"Climate describes long-term averages, not day-to-day conditions. Weather is the correct first term, and the standard period used for climate averages is about 30 years."},{"text":"Weather means day-to-day atmospheric conditions; climate is average weather over about 10 years.","correct":false,"explanation":"The first term is correct, but climate averages are conventionally calculated over about 30 years, not 10 years. The shorter period can make results less representative."},{"text":"Weather means day-to-day atmospheric conditions; climate is average weather over about 100 years.","correct":false,"explanation":"Weather is short-term and climate is long-term, but the usual climate average is about 30 years, not 100 years. A century is an unnecessary extension of the standard period."}]},{"id":"b29a62ff-7021-46e5-b617-8509fa3a5af2","cardType":"basic","points":1,"front":"What broad ecosystem does the UK’s cool temperate climate support?","back":"Temperate deciduous woodland.","mcqOptions":[{"text":"Temperate deciduous woodland.","correct":true,"explanation":"The UK’s cool temperate climate has moderate temperatures and enough rainfall to support temperate deciduous woodland, whose trees shed leaves in autumn."},{"text":"Tropical rainforest.","correct":false,"explanation":"Tropical rainforest requires consistently high temperatures and heavy rainfall, which the UK’s cool temperate climate does not provide. The supported broad ecosystem is temperate deciduous woodland."},{"text":"Hot desert.","correct":false,"explanation":"Hot desert ecosystems need very low rainfall and usually high temperatures, unlike the UK’s cool, relatively wet climate. Temperate deciduous woodland is the appropriate ecosystem."},{"text":"Tundra.","correct":false,"explanation":"Tundra has extremely cold conditions and a very short growing season, unlike most of the UK. The UK’s climate supports temperate deciduous woodland."}]},{"id":"56a388c4-ceb6-4db4-9a49-f9e3dd8a7f55","cardType":"cloze","points":null,"front":"Soil [ ] means how much water soil holds; [ ] means how easily water moves through it.","back":"Soil moisture means how much water soil holds; drainage means how easily water moves through it.","mcqOptions":[{"text":"Soil moisture means how much water soil holds; drainage means how easily water moves through it.","correct":true,"explanation":"Soil moisture is the amount of water held in soil, while drainage describes how easily water moves through the soil. These are related but distinct soil characteristics."},{"text":"Soil drainage means how much water soil holds; moisture means how easily water moves through it.","correct":false,"explanation":"Drainage concerns how easily water moves through soil, not how much water it holds. Moisture is the correct first term, while drainage belongs in the second blank."},{"text":"Soil fertility means how much water soil holds; drainage means how easily water moves through it.","correct":false,"explanation":"Fertility refers to the soil’s ability to support plant growth through available nutrients, not its water content. Moisture and drainage are the required terms."},{"text":"Soil moisture means how much water soil holds; permeability means how easily water moves through it.","correct":false,"explanation":"Permeability describes how easily water passes through a material, but it is not the term defined here for the amount of water soil holds. The correct pair is moisture and drainage."}]},{"id":"22104067-3289-4706-97fd-11c7d95b8650","cardType":"basic","points":2,"front":"Why can shallow soil limit plant growth?","back":"Roots have less space.","mcqOptions":[{"text":"Roots have less space.","correct":true,"explanation":"Shallow soil provides limited room for roots to spread and anchor the plant. This restricts access to water and nutrients, which can reduce healthy plant growth."},{"text":"Roots have less sunlight.","correct":false,"explanation":"Shallow soil does not necessarily reduce the amount of sunlight reaching a plant. The limiting factor is root space, because roots have less room to spread and obtain water and nutrients."},{"text":"Roots have less warmth.","correct":false,"explanation":"Soil depth does not directly determine how much warmth reaches the leaves. Shallow soil limits growth mainly because roots have less space for water and nutrient uptake."},{"text":"Roots have less water.","correct":false,"explanation":"Shallow soil can sometimes dry out quickly, but the key limitation described is restricted room for roots. Therefore, roots have less space to spread and support the plant."}]},{"id":"b4dc1bdf-918b-4955-87d4-4145b48edaa2","cardType":"basic","points":2,"front":"How do tree roots help reduce soil erosion?","back":"They bind soil together.","mcqOptions":[{"text":"They bind soil together.","correct":true,"explanation":"Tree roots spread through the soil and hold soil particles together. This makes it harder for rainwater to wash the soil away, reducing erosion."},{"text":"They loosen soil together.","correct":false,"explanation":"Roots do not remove soil particles to prevent erosion. Their important role is to bind soil together, increasing its stability against rainwater runoff."},{"text":"They absorb water together.","correct":false,"explanation":"Roots may absorb water, but they do not bind water together. Erosion is reduced because roots bind soil particles and help hold them in place."},{"text":"They separate soil together.","correct":false,"explanation":"Roots can create spaces in soil as they grow, but this is not the process that reduces erosion. Their main protective effect is binding soil together."}]},{"id":"876c8ca9-9e81-4917-bb13-51b30f5d5dd0","cardType":"basic","points":2,"front":"How do fallen leaves affect soil?","back":"They decay and add organic matter.","mcqOptions":[{"text":"They decay and add organic matter.","correct":true,"explanation":"Fallen leaves are decomposed by organisms such as fungi and bacteria. This decay releases organic matter and nutrients, improving the soil’s fertility."},{"text":"They evaporate and add organic matter.","correct":false,"explanation":"Fallen leaves do not remain permanently unchanged in the soil. Decomposers break them down through decay, adding organic matter and releasing nutrients."},{"text":"They absorb and add organic matter.","correct":false,"explanation":"Leaves do not remove organic matter as they break down. Their decay contributes organic matter to the soil and can increase nutrient availability."},{"text":"They reflect and add organic matter.","correct":false,"explanation":"Fallen leaves are not converted directly into sunlight. They decay through decomposition, adding organic matter and nutrients to the soil."}]},{"id":"5b407537-cb6d-4343-a98d-2f6bd42e8503","cardType":"cloze","points":null,"front":"A [ ] makes its own food using sunlight; a [ ] gets energy by eating plants or animals.","back":"A producer makes its own food using sunlight; a consumer gets energy by eating plants or animals.","mcqOptions":[{"text":"A producer makes its own food using sunlight; a consumer gets energy by eating plants or animals.","correct":true,"explanation":"A producer makes its own food, usually by photosynthesis using sunlight. A consumer cannot make its own food and gains energy by eating plants or animals."},{"text":"A consumer makes its own food using sunlight; a producer gets energy by eating plants or animals.","correct":false,"explanation":"A consumer obtains energy by eating other organisms, whereas a producer makes its own food using sunlight. The terms have been reversed in this option."},{"text":"A decomposer makes its own food using sunlight; a predator gets energy by eating plants or animals.","correct":false,"explanation":"A decomposer breaks down dead material rather than making its own food, and a predator is a type of consumer. Neither term correctly completes both definitions."},{"text":"A herbivore makes its own food using sunlight; a plant gets energy by eating plants or animals.","correct":false,"explanation":"Herbivores eat plants and are consumers, while plants are producers. This option incorrectly assigns the food-making role to an animal and the eating role to a plant."}]},{"id":"813883b2-f881-45b9-be86-7ce37e703737","cardType":"cloze","points":null,"front":"A [ ] breaks down dead plants and animals, returning [ ] to soil.","back":"A decomposer breaks down dead plants and animals, returning nutrients to soil.","mcqOptions":[{"text":"A decomposer breaks down dead plants and animals, returning nutrients to soil.","correct":true,"explanation":"Decomposers, including fungi and bacteria, break down dead organisms. They return nutrients to the soil, where plants can absorb them for growth."},{"text":"A producer breaks down dead plants and animals, returning nutrients to soil.","correct":false,"explanation":"Producers make food using sunlight but do not mainly break down dead material. Decomposers perform this role and return nutrients to the soil."},{"text":"A consumer breaks down dead plants and animals, returning energy to soil.","correct":false,"explanation":"Consumers obtain energy by eating organisms rather than decomposing dead matter. Decomposers break down dead plants and animals and release nutrients into the soil."},{"text":"A predator breaks down dead plants and animals, returning sunlight to soil.","correct":false,"explanation":"Predators eat living prey and do not carry out the main decomposition process. Decomposers break down dead material and return nutrients, not sunlight, to soil."}]},{"id":"245e479f-b831-4b2a-bb42-3a51cf1791ba","cardType":"cloze","points":null,"front":"[ ] means ecosystem components depend on and influence each other, so one change can affect [ ].","back":"Interdependence means ecosystem components depend on and influence each other, so one change can affect several others.","mcqOptions":[{"text":"Interdependence means ecosystem components depend on and influence each other, so one change can affect several others.","correct":true,"explanation":"Interdependence describes how ecosystem components rely on and affect one another. Because of these links, a change in one component can influence several others."},{"text":"Competition means ecosystem components depend on and influence each other, so one change can affect several others.","correct":false,"explanation":"Competition is one interaction between organisms, not the general dependence of all ecosystem components. The wider concept is interdependence, and one change can affect several others."},{"text":"Interdependence means ecosystem components depend on and influence each other, so one change can affect one other.","correct":false,"explanation":"The effect of an ecosystem change is not limited to one other component. Interdependence means linked components can influence several others."},{"text":"Interdependence means ecosystem components depend on and influence each other, so one change can affect the whole climate.","correct":false,"explanation":"Interdependence concerns relationships among living and non-living components, not just a change affecting the whole ecosystem directly. A change can affect several other components."}]},{"id":"85263779-0b57-4f60-a610-79f7572ae18b","cardType":"basic","points":1,"front":"What interaction direction is rainfall affecting soil moisture and plant growth?","back":"Abiotic to biotic.","mcqOptions":[{"text":"Abiotic to biotic.","correct":true,"explanation":"Rainfall is a non-living, abiotic factor. Soil moisture and plant growth are ecosystem conditions or living responses, so this interaction is described as abiotic to biotic."},{"text":"Biotic to abiotic.","correct":false,"explanation":"The interaction starts with rainfall, which is abiotic, so it cannot be described as biotic to abiotic. The correct direction is abiotic to biotic."},{"text":"Abiotic to abiotic.","correct":false,"explanation":"Rainfall is not a living component, and plant growth is not abiotic. The relevant direction is from the abiotic factor rainfall to biotic plant growth."},{"text":"Biotic to biotic.","correct":false,"explanation":"Rainfall is abiotic rather than biotic, so this is not a biotic-to-biotic interaction. Its effect is classified as abiotic to biotic."}]},{"id":"6ea24993-d6e9-4827-99b9-bfc880879119","cardType":"basic","points":2,"front":"How can visitors alter Epping Forest soil?","back":"They can compact soil through trampling.","mcqOptions":[{"text":"They can compact soil through trampling.","correct":true,"explanation":"Trampling compresses soil particles, reducing the pore spaces between them. This compaction can reduce drainage and air spaces, altering soil conditions in Epping Forest."},{"text":"They can loosen soil through trampling.","correct":false,"explanation":"Trampling generally presses soil particles closer together rather than loosening them. Visitors therefore compact soil, which can reduce pore spaces and drainage."},{"text":"They can create soil through trampling.","correct":false,"explanation":"Visitors do not normally create soil through walking on it. Trampling changes existing soil by compacting its particles and reducing air spaces."},{"text":"They can remove soil through trampling.","correct":false,"explanation":"Trampling does not make soil disappear by itself. It presses particles together, so the relevant effect of visitors is soil compaction."}]},{"id":"0eba2d0d-9639-49e3-a319-f9eaefda29f7","cardType":"basic","points":2,"front":"If spring rainfall is much lower, what happens to woodland soil moisture?","back":"Soil moisture decreases.","mcqOptions":[{"text":"Soil moisture decreases.","correct":true,"explanation":"Lower spring rainfall supplies less water to infiltrate and replenish the soil, while plants and evaporation continue removing water, so soil moisture decreases."},{"text":"Soil moisture increases.","correct":false,"explanation":"This reverses the relationship between rainfall and soil water. Lower spring rainfall reduces infiltration, so the correct outcome is that soil moisture decreases."},{"text":"Soil moisture remains unchanged.","correct":false,"explanation":"This overlooks rainfall as an important input to the woodland water cycle. With much less spring rainfall, the soil receives less water, so soil moisture decreases."},{"text":"Soil moisture reaches saturation.","correct":false,"explanation":"Saturation occurs when soil spaces fill with water, usually after substantial rainfall. Much lower rainfall has the opposite effect, causing soil moisture to decrease."}]},{"id":"6a86a239-8cb6-45bb-8ddd-ddbbe82ddeda","cardType":"basic","points":1,"front":"If plants produce fewer leaves, flowers or seeds, which consumers have less food?","back":"Herbivores.","mcqOptions":[{"text":"Herbivores.","correct":true,"explanation":"Herbivores feed directly on plant material such as leaves, flowers and seeds. If plants produce fewer of these parts, less food is available to herbivores."},{"text":"Carnivores.","correct":false,"explanation":"Carnivores feed mainly on other animals rather than directly on leaves, flowers or seeds. Herbivores have less food because these plant materials form their diet."},{"text":"Insectivores.","correct":false,"explanation":"Insectivores obtain their food by eating insects, not by directly consuming leaves, flowers or seeds. The consumers immediately affected are herbivores."},{"text":"Piscivores.","correct":false,"explanation":"Piscivores eat fish, so reduced production of leaves, flowers or seeds does not directly reduce their food supply. These plant materials provide food for herbivores."}]},{"id":"7bdca84c-8840-4b59-b220-4e4b09fc5d00","cardType":"basic","points":2,"front":"If birds have less insect prey, what may happen to nesting success?","back":"It may decrease.","mcqOptions":[{"text":"It may decrease.","correct":true,"explanation":"Many birds depend on insects to feed their chicks. With less prey available, fewer chicks may survive or develop successfully, so nesting success may decrease."},{"text":"It may increase.","correct":false,"explanation":"This reverses the expected effect of reduced food availability. With fewer insects, adult birds may struggle to feed their chicks, so nesting success may decrease."},{"text":"It may remain unchanged.","correct":false,"explanation":"This overlooks the importance of insect prey for feeding chicks. A shortage can reduce chick growth and survival, meaning nesting success may decrease."},{"text":"It may become more reliable.","correct":false,"explanation":"Reduced insect prey makes successful nesting less, not more, reliable. Parents have greater difficulty supplying enough food, so nesting success may decrease."}]},{"id":"50ba530a-8f9e-4f41-916d-e523fbb19d48","cardType":"basic","points":2,"front":"If rainfall decreases in a pond, what happens to pond depth?","back":"The pond becomes shallower.","mcqOptions":[{"text":"The pond becomes shallower.","correct":true,"explanation":"Reduced rainfall means less water enters and replenishes the pond. As evaporation and drainage continue, the water level falls and the pond becomes shallower."},{"text":"The pond becomes deeper.","correct":false,"explanation":"This reverses the effect of reduced rainfall. With less water entering the pond and continued water loss, the water level falls and the pond becomes shallower."},{"text":"The pond becomes wider.","correct":false,"explanation":"Lower rainfall does not add water that could expand the pond. Reduced input lowers its water level, so the pond becomes shallower rather than wider."},{"text":"The pond becomes fuller.","correct":false,"explanation":"A fuller pond would require an increased water input. When rainfall decreases, less water replaces ongoing losses, so the pond instead becomes shallower."}]},{"id":"116b9b8c-2b40-4f5e-a77b-310f993201a4","cardType":"basic","points":2,"front":"If a pond becomes shallower after low rainfall, what happens to oxygen levels?","back":"Oxygen levels decrease.","mcqOptions":[{"text":"Oxygen levels decrease.","correct":true,"explanation":"A shallower pond contains less water and heats up more easily. Warmer water holds less dissolved oxygen, so oxygen levels decrease."},{"text":"Oxygen levels remain constant.","correct":false,"explanation":"This ignores how lower water volume and warmer conditions affect dissolved oxygen. A shallower pond generally holds less oxygen, so oxygen levels decrease."},{"text":"Oxygen levels increase.","correct":false,"explanation":"This reverses the expected change. Shallower water warms more easily, and warmer water holds less dissolved oxygen, so oxygen levels decrease."},{"text":"Oxygen levels reach saturation.","correct":false,"explanation":"Oxygen saturation is not caused simply by falling water depth. Shallower ponds usually warm more quickly and support less dissolved oxygen, so oxygen levels decrease."}]},{"id":"02bc42e6-67e5-4c0b-b707-6767dc9d5f3f","cardType":"basic","points":1,"front":"What regional ecosystem is Epping Forest an example of?","back":"A temperate deciduous woodland.","mcqOptions":[{"text":"A temperate deciduous woodland.","correct":true,"explanation":"Epping Forest lies in the UK’s temperate climate and contains broad-leaved trees that shed their leaves seasonally, so it is a temperate deciduous woodland."},{"text":"A tropical rainforest.","correct":false,"explanation":"Tropical rainforests occur in hot, wet equatorial climates and remain evergreen. Epping Forest has broad-leaved trees that seasonally lose their leaves, making it a temperate deciduous woodland."},{"text":"A temperate coniferous woodland.","correct":false,"explanation":"Coniferous woodland is dominated by needle-leaved, usually evergreen trees. Epping Forest is mainly broad-leaved and seasonally loses its leaves, so it is temperate deciduous woodland."},{"text":"A Mediterranean shrubland.","correct":false,"explanation":"Mediterranean shrubland is adapted to hot, dry summers and mild, wet winters. Epping Forest occurs in a cooler temperate climate and is temperate deciduous woodland."}]}]}],"examCountdown":{"examDate":"2027-05-18","paperLabel":"Paper 1"},"heading":"Ecosystem components","title":"Ecosystem components Flashcards","topbar":{"backHref":"/gcse/geography/ocr/a/flashcards"},"topicSidebar":"$L38"}]}],"topicId":"b0e9bc8d-20bc-5901-8293-e0cf48eab8f1","walled":"$L39"}],"$L3a","$L3b"]