Food web analysis

What do the arrows represent?

• Who eats who

• What eats what

• A flow of energy

• Breeding patterns

What do we call the organisms at the start of a food chain?

• Producer

• Primary consumer

• Herbivore

• Carnivore

Which organism is the producer in this food chain?

• Plankton

• Orca

• Leopard seal

• Penguin

Which two organisms are primary consumers/herbivores?

• Plankton

• Orca

• Arctic code

• Krill

Which organism is the carnivore that consumes (eats) the penguin?

• Plankton

• Orca

• Arctic code

• Krill

What may happen to the number of Leopard Seals if the krill numbers fell?

• There would be more Leopard Seals as they would have more krill to eat.

• There would be fewer Leopard Seals as they would have more krill to eat.

• There would be no change as Leopard seals don't eat krill.

If the number of Leopard Seals went up, what two effects may you see?

• Krill numbers would go down as more are eaten.

• Baleen Whale numbers would go up as they would have more seals to eat.

• Plankton numbers would go down as the seals would eat more of them.

• Penguin numbers may fall as they have less krill to eat.

Which activities could cause the number of organisms in the oceans to go down?

• Diseases

• Plastic pollution

• Chemical pollution

• Illegal fishing or over fishing

Which of these is a better answer to the question "explain what would happen to the number of Arctic Cod if the plankton died out".

• Their numbers would go down.

• The plankton numbers go down so there is less food for the krill and the cod, so the numbers of both will be affected if the plankton died out.

• The cod numbers would go down because they would have less plankton to eat.