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Revision notes on 5.3.6 Trophic Levels for the AQA A Level Biology syllabus, written by the Biology experts at Save My Exams.
Book Ref Key Term Definition . 2.1 Energy The ability to do work 2.1 Phosphorylation The process of adding a phosphate group (e.g. ADP ATP) Chapter 3 – Photosynthesis . Book Ref Key Term Definition . 3.1 Light Dependent Reaction Stage of photosynthesis in which light energy is required to produce ATP and reduced NADP
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Summary notes and past exam questions by topic for AQA Biology A-Level Topic 5 - Energy Transfers In and Between Organisms
- Producers
- Primary Consumers
- Secondary Consumers
- Tertiary Consumers
Producers or autotrophs (grasses, green plants) occupy the first level or at the bottom of the energy pyramid.
The second trophic level is occupied by primary consumers or herbivores like grasshoppers that feed on primary producers for food and energy.
The organisms occupying the third trophic level are known as secondary consumers. These organisms include carnivorous animals like frogs that feed on grasshoppers.
It is the last level of the energy pyramid consisting of organisms like owls, hawks, and foxes that consume both primary and secondary consumers for food. Only a mere 0.1% of the solar energy absorbed by producers reaches this level.
Revision for AQA Biology AS and A Level Papers, including summary notes, worksheets and past exam questions for each topic.
Oct 19, 2023 · On average only 10 percent of energy available at one trophic level is passed on to the next. This is known as the 10 percent rule, and it limits the number of trophic levels an ecosystem can support. Hawks are at the top of the food chain—the apex predators—of their respective ecosystems.
Aug 20, 2024 · Virtually every task performed by living organisms requires energy. Nutrients and other molecules are imported into the cell to meet these energy demands. For example, energy is required for the synthesis and breakdown of molecules, as well as the transport of molecules into and out of cells.
