Ecosystems and Their Interactions
The living and non-living parts of an ecosystem and how they depend on each other.
9 questions, free, marked as you go with a worked explanation on every one.
What this covers
- ecosystems and food chains
The questions
- In a food chain, what is a producer?
- Which of these are non-living (abiotic) parts of an ecosystem? Select all that apply.
- What do decomposers do in an ecosystem?
- In the chain grass → rabbit → fox, what happens to the fox population if disease kills most of the rabbits?
- A bee collects nectar from a flower and carries pollen between plants. What kind of relationship is this?
- A new predator with no natural enemies is introduced to an ecosystem. What is the likely effect?
- A wetland with many different plant and insect species is hit by a disease that wipes out one insect species. It carries on much as before. A nearby pond with only a few species is hit the same way and changes dramatically. What best explains the difference?
- A biologist counts 240 trout in a lake one summer. Five years later, after a stream feeding the lake is diverted, the count is 180 trout. By what percentage has the trout population fallen?
- Use the table. Which organism's role is to break down dead material and return nutrients to the ecosystem?