Biology · Grades 4–8
Food chains, food webs and energy · Revision sheet
Use arrows consistently and distinguish cycling matter from flowing energy.
Learn the idea
Arrows
In this guide, arrows point from a food source toward the consumer receiving energy.
Producer
A primary producer builds organic material using an energy source such as light.
Web
A food web contains several connected feeding relationships.
Energy
Energy transfers through the system with dissipation; matter can cycle through reservoirs.
Explain without looking
- Why can removing one species affect more than one part of a food web?
- Should a fixed 10% transfer rule be used as an exact value for every ecosystem?
Further reading and review references
- openstax.org · reference 1
- www.genome.gov · reference 2
- www.genome.gov · reference 3
- www.genome.gov · reference 4
- www.genome.gov · reference 5
- www.genome.gov · reference 6
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Independent educational review required. Grade bands are approximate; these are not officially aligned curricula.