19.2 Food chains and food webs
- Syllabus
- 0610–2026–2027
- Topic
- 19.2
- Level
- —
19.2.1—Food chain as showing the transfer
- Describe a food chain as showing the transfer of energy from one organism to the next, beginning with a producer
19.2.2—Construct and interpret simple food
- Construct and interpret simple food chains
19.2.3—Food web as a network
- Describe a food web as a network of interconnected food chains and interpret food webs
19.2.4—Producer as an organism that makes its
- Describe a producer as an organism that makes its own organic nutrients, usually using energy from sunlight, through photosynthesis
19.2.5—Consumer as an organism that gets its
- Describe a consumer as an organism that gets its energy by feeding on other organisms
19.2.6—Consumers may be classed as primary
- State that consumers may be classed as primary, secondary, tertiary and quaternary according to their position in a food chain
19.2.7—Herbivore as an animal that gets its
- Describe a herbivore as an animal that gets its energy by eating plants
19.2.8—Carnivore as an animal that gets its
- Describe a carnivore as an animal that gets its energy by eating other animals
19.2.9—Decomposer as an organism that gets
- Describe a decomposer as an organism that gets its energy from dead or waste organic material
19.2.10—Food chains and food webs to describe
- Use food chains and food webs to describe the impact humans have through overharvesting of food species and through introducing foreign species to a habitat
19.2.11—Pyramids of numbers and pyramids
- Draw, describe and interpret pyramids of numbers and pyramids of biomass
19.2.12—Pyramids of biomass
- Discuss the advantages of using a pyramid of biomass rather than a pyramid of numbers to represent a food chain
19.2.13—Trophic level as the position
- Describe a trophic level as the position of an organism in a food chain, food web or ecological pyramid
19.2.14—Following as the trophic levels
- Identify the following as the trophic levels in food webs, food chains and ecological pyramids: producers, primary consumers, secondary consumers, tertiary consumers and quaternary consumers
19.2.15—Pyramids of energy
- Draw, describe and interpret pyramids of energy
19.2.16—Pyramids of energy
- Discuss the advantages of using a pyramid of energy rather than pyramids of numbers or biomass to represent a food chain
19.2.17—Transfer of energy from one trophic
- Explain why the transfer of energy from one trophic level to another is often not efficient
19.2.18—Explain, in terms of energy loss, why
- Explain, in terms of energy loss, why food chains usually have fewer than five trophic levels
19.2.19—It is more energy efficient for humans
- Explain why it is more energy efficient for humans to eat crop plants than to eat livestock that have been fed on crop plants
Objective notes
19 learning objectivesConceptIGCSE Biology