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SingaporeCombined ScienceQuick questions
Biology: Genetics and Ecology
Quick questions on Ecosystems and food chains: N(A)-Level Combined Science Biology
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are food chains?Show answer
A food chain shows how energy passes from one organism to the next as food. The arrows point in the direction the energy flows (from the eaten to the eater). For example:
What are food webs?Show answer
In a real habitat, most animals eat more than one type of food and are eaten by more than one predator. A food web joins many food chains together to show these links. If one organism in a web changes in number, it affects the others connected to it.
What is energy loss along a chain?Show answer
Energy enters the chain as sunlight, captured by producers. At each step, much of the energy is lost rather than passed on, because organisms:
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