🎯 Try it

Single choice

In grass → rabbit, what does the arrow mean?

Rabbit energy comes from food. Grass uses sunlight to make sugars.

⏱️ Practice timer
05:00

🔎 Worked example

📝 Organism cards: read, point, or cut out

Use these supplied feeding links for this simplified meadow model. Real diets vary by species and habitat.

Card
Food or energy source in this model
Grass
Uses sunlight to make sugars
Rabbit
Eats grass
Grasshopper
Eats grass
Frog
Eats grasshoppers
Fox
Eats rabbits and frogs
Leafy plant
Uses sunlight to make sugars
Caterpillar
Eats leaves
Bird
Eats caterpillars; can be eaten by foxes

One organism can have several feeding links.

Write grass → rabbit → fox. Arrows show the direction energy transfers when one organism is eaten, not who chases whom. Grass is a producer. Rabbits are consumers. Add grass → grasshopper → frog → fox to build a simple web. Decomposers break down dead material; nutrients cycle, while energy enters and eventually spreads to the surroundings.

✏️ Practice

  • 1.
    Build a three-organism chain starting with grass.
  • 2.
    Build a four-organism chain starting with grass.
  • 3.
    Add the leafy plant, caterpillar, and bird to your web; connect the bird to the fox.
  • 4.
    Predict one possible effect of fewer grasshoppers on frogs. Use “may” and explain why.
  • 5.
    Add a decomposer note. Distinguish nutrients from energy.
  • 💭 Your answer

    Single choice

    Which is a producer here?

    ✅ Quick check

    Single choice

    If foxes can eat rabbits and frogs, how should you draw the arrows?

    🔑 Answers

    🔑 Practice answers

  • 1.
    Grass → rabbit → fox. Arrows follow feeding energy toward the eater.
  • 2.
    Grass → grasshopper → frog → fox.
  • 3.
    Leafy plant → caterpillar → bird → fox. The fox has several food sources in this model.
  • 4.
    Fewer grasshoppers may mean less food for frogs and fewer frogs later. Other food sources, movement, and timing could change this result.
  • 5.
    Decomposers break down dead material and release nutrients for reuse. Energy transfers and spreads to the surroundings; it does not cycle like nutrients.
  • 💡 Hint and challenge

    💡 Hint: Use three cards first and physically pass an energy token along the arrows.

    Challenge: Explain why a food web gives a better prediction than one isolated chain.

    🔎 Challenge answer

    A web shows alternative food sources. A fox population might be buffered by rabbits when frogs become less available; a single frog chain misses that possibility. This is a possibility, not a certain prediction.

    ➡️ Next lesson

    Seed germination investigation.