THE EXAMS POINTA simple food-chain model
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A simple food-chain model
01 · Grass
Producer fixes carbon and stores chemical energy.
02 · Grasshopper
Primary consumer obtains energy by feeding on plants.
03 · Frog
Secondary consumer feeds on the herbivore.
04 · Snake
A further consumer receives a smaller share of the original energy.
Connect the branches
Food-chain arrows indicate energy transfer from the food to the consumer. Real ecosystems contain interconnected food webs.
Avoid the exam trap
The ten-percent rule is an approximation, not a universal exact efficiency.
Test yourself: In this diagram, which way does the energy-transfer arrow point?
From grass to grasshopper, because energy moves from the food organism to its consumer.
A concise revision aid with simplified connections. It supports the full chapter and primary references; it does not replace them.