BGCSE Ecosystems — practice questions
22 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice BGCSE Ecosystems in the app →A class studies a tide pool and then the Amazon rainforest, and calls both by the same term. Both are examplesLand ecosystems are gathered into large categories such as desert and tundra. Those categories are called:A pupil lists examples of them: tropical rainforest, savanna, grassland, temperate forest, tundra and:Plants make their own food from sunlight rather than eating anything. Organisms that can do this are:Animals cannot do that and must eat other organisms to get energy. Such organisms are:At the base of a food chain sit the photosynthetic organisms. In that chain they are known as the:The herbivores that eat those organisms occupy the next level up. They are the:Carnivores that eat those herbivores are usually described as:At the very top of the chain sit the organisms nothing else eats. They are called the:Each organism sits at a specific position in the chain, measured by its energy level. That position is its:A diagram showing every feeding link between many species, not just one line, is a food:Moving up each trophic level, some energy escapes as heat and to decomposers. The energy available above thereThat loss explains why food chains cannot go on for ever. Eventually the remaining energy cannot support:Fungi, moulds, earthworms and soil bacteria feed on dead producers and consumers alike. They are the:Their work returns mineral nutrients to circulation. Those nutrients are said to be:Ecologists subtract respiration and heat loss from what producers capture. What remains is the net primary:Species numbers shift a little, yet overall biodiversity stays roughly constant. That dynamic state is called:Two parameters are used to measure how ecosystems change. They are resilience and:A forest is hit by drought yet barely changes. That ability to stay at equilibrium despite disturbance is its:A second forest is knocked back by fire but returns to its old state quickly. That speed of recovery is its:Arctic tundra soil often stays frozen all year round. That permanently frozen ground is called:In a lake, the depth down to which photosynthesis can still happen, roughly 200 metres, is the: