Ecosystems 3

Year 10 Topic 2 – Learning Opportunity 3: Interdependence.
This learning opportunity has 6 tasks to complete.
Target time: 50 minutes.

By the end of this learning opportunity you will be able to: describe the importance of interdependence in a community.

Key words: interdependence, food chain, food web, producer, consumer, predator, prey.

Task 1: Fill in the gaps to define interdependence. Watch the video below up until 2 minutes to help.

Interdependence means that organisms depend on each other for things like ________ and __________ in order to ________. If there is a change in the population of one species there will be a knock on effect for ________________.

Find the answers at the end of the blog.

Task 2: Add a key to identify the producers (usually plants) and consumers in the food web image below.

Find the answers at the end of the blog.

Task 3: Write out 6 food chains shown within the food web in task 2.

1.
2.
3.
4.
5.
6.

Hint – start with a producer and follow the energy transfer arrows.

Find the answers at the end of the blog.

Task 4: Write a short paragraph explaining what would happen to the other organisms if the starfish all died. Include reasons why.

Sentence starter if needed –
If the starfish died the number of … would… because…

Find the answers at the end of the blog.

Task 1: Answers

Interdependence means that organisms depend on each other for things like food and shelter in order to survive. If there is a change in the population of one species, there will be a knock on effect for another species.

Task 2: Answers

Plankton and seaweed = producers
All other organisms = consumers

Task 3: Answers

Plankton → mussels → starfish
Plankton → small fish → big fish → humans
Plankton → small fish → big fish → sea birds
Plankton → small fish → sea birds
Seaweed → limpets → small fish → big fish → humans
Seaweed → limpets → small fish → sea birds

Task 4: Answers

There would be more mussels due to less predators/starfish eating them, so there would be less plankton due to more mussels eating it.

Less plankton would mean small fish have to eat more limpets, so there would be less limpets. Less limpets would mean more seaweed due to less limpets eating it.

Task 5: Complete the quiz using the link below.

Quiz

Challenge Task: Complete the exam question.

Challenge Task: Answers

End of Learning Opportunity 3