Summary
Food chains and food webs illustrate how energy is transferred between organisms in an ecosystem, starting from the Sun.
- Producer — an organism that can make its own food through photosynthesis. Example: Plants are producers because they photosynthesize to create food.
- Consumer — an organism that cannot make its own food and must eat other organisms to obtain energy. Example: Humans and rabbits are consumers because they eat plants and/or animals.
- Herbivore — an animal that eats only plants. Example: Rabbits are herbivores because they eat plants.
- Carnivore — an animal that eats only other animals. Example: Hawks are carnivores because they eat rabbits.
- Omnivore — an animal that eats both plants and animals. Example: Humans are omnivores because they eat both plants and animals.
- Predator — an animal that hunts and kills other animals for food. Example: Hawks are predators because they hunt rabbits.
- Food Chain — a sequence that shows how energy is transferred from one organism to another. Example: A simple food chain might be grass → rabbit → hawk.
- Food Web — a complex network of interconnected food chains showing how organisms are related through their dietary habits. Example: A food web includes multiple food chains where a rabbit might be eaten by both hawks and foxes.
Exam Tips
Key Definitions to Remember
- Producer: An organism that makes its own food.
- Consumer: An organism that eats other organisms for energy.
- Herbivore: An animal that eats only plants.
- Carnivore: An animal that eats only other animals.
- Omnivore: An animal that eats both plants and animals.
- Predator: An animal that hunts other animals for food.
- Food Chain: A sequence showing energy transfer between organisms.
- Food Web: A network of interconnected food chains.
Common Confusions
- Confusing producers with consumers.
- Thinking that all consumers are predators.
Typical Exam Questions
- What is a producer? An organism that makes its own food through photosynthesis.
- How does energy flow in a food chain? Energy flows from producers to various levels of consumers.
- What happens if a primary consumer population decreases? The population of predators may decrease due to less available food.
What Examiners Usually Test
- Understanding of energy flow in food chains and webs.
- Ability to identify producers, consumers, and predators.
- Effects of changes in population within a food web.