Cambridge O Level Biology · Syllabus 5090 · Relationships of Organisms with One Another and with the Environment
Conservation
What is Conservation?
The protection and careful management of species, habitats and ecosystems so that they are maintained for the future. Conservation aims to keep biodiversity high, to reduce the risk of extinction, to protect vulnerable habitats, and to preserve the genetic variation within populations that allows them to adapt to disease and to changing conditions. It also maintains the processes ecosystems provide, such as nutrient cycling, pollination and soil stabilisation. Conservation manages human use of a resource rather than preventing all use of it.
This definition is part of the Relationships of Organisms with One Another and with the Environment chapter in Cambridge O Level Biology.
Conservation in context
Ecosystems run on one input and two very different accounting systems. Light energy from the Sun enters through photosynthesis, passes along food chains by feeding, and is transferred to the environment as thermal energy at every step — so energy flows through an ecosystem and is never recycled. The atoms carried with it are different: carbon and nitrogen move from air to producer to consumer to decomposer and back to the air, so matter cycles and is used again. Everything else in this topic — short food chains, ecological pyramids, the carbon and nitrogen cycles, eutrophication, conservation — is a consequence of those two sentences.
Examiner tips on Conservation
- Four conclusions that lose marks. “Ban all fishing” — ignores that conservation manages use rather than ending it. “Education will solve it” — education changes understanding, not the removal rate, on its own. “Quotas always work” — they work only when set correctly and enforced. “Replanting restores the ecosystem” — it restores tree cover; biodiversity is a separate measurement. Each of these states an outcome without the mechanism or the evidence.