Key Points

✓Food chains show the flow of energy in an ecosystem.
✓Plants are producers and make their own food using sunlight.
✓Animals are consumers and eat plants or other animals.
✓Decomposers break down dead organisms and recycle nutrients.
✓Each step in a food chain is called a trophic level.

A food chain shows how living things get their food, and how energy is transferred from one organism to another. It all starts with the sun! Plants use sunlight to make their own food through a process called photosynthesis. These plants are then eaten by animals, who are in turn eaten by other animals. This creates a chain of who eats whom. Each step in the food chain is called a trophic level. Producers (like plants) are at the bottom, followed by consumers (animals that eat plants or other animals). Decomposers (like fungi and bacteria) break down dead plants and animals, returning nutrients to the soil, which helps plants grow. Food chains help us understand how ecosystems work and how all living things are connected.

Worked Example

Draw a simple food chain with a plant, a grasshopper, and a frog. Label each organism as a producer or consumer.

Step 1: Start with the producer, which is the plant. Draw a plant.
Step 2: Next, draw the grasshopper eating the plant. The grasshopper is a consumer.
Step 3: Finally, draw the frog eating the grasshopper. The frog is also a consumer.
Step 4: Draw arrows showing the direction of energy flow: from the plant to the grasshopper, and from the grasshopper to the frog.
Step 5: Label the plant as a producer and the grasshopper and frog as consumers.

Answer: Plant (Producer) -> Grasshopper (Consumer) -> Frog (Consumer)

Try It Yourself

1. What is the role of a producer in a food chain?

2. Arrange the following organisms into a food chain: snake, grass, mouse, eagle.

3. Explain what would happen to the mouse population if all the snakes in an ecosystem were removed.

Watch Out For These Mistakes

Thinking that food chains only have three or four organisms.
Forgetting that decomposers are an important part of the ecosystem.
Not understanding the direction of energy flow in a food chain (arrows point to what is eating).