BIOL - Food Chain and Food Web
Biology, food chain, food web, trophic level - IGCSE | IBDP | DSE | GCE | IAL Biology
A food chain shows the feeding relationship between organisms.
If we look at the food chain below, locust eats maize, lizard eats locust, and snake eats lizard.
The arrow in a food chain always points from the food to the feeder.
Each stage in a food chain is called the trophic level.
A food web is a collection of food chains in an ecosystem that shows how different organisms depend on each other.
👇 An example of a food web 👇
Some questions that may be asked on IGCSE Biology exam are:
1. Identify all the producers in the food web.
2. Give the trophic level of owls in this food web.
3. Name an organism that occurs at two different trophic levels in this food web.
4. Give the food chain from this web that contains four different organisms including grasses.
grasses → grasshoppers → birds → foxes
Energy Transfer Along the Food Chain
In a food chain, only around 10% of energy is transferred from one trophic level to the next trophic level. Energy is lost along the food chain because:
Wanna Boost Up Your IGCSE Biology?
We just sent you an email. Please click the link in the email to confirm your subscription!