keystone species and trophic levels

In an energy pyramid, how much of the energy in each level gets passed to the next level above it?

• 80%

• 90%

• 10%

• 20%

Which of the following is a herbivore?

• cricket
• frog
• hawk
• shrew

An organism that obtains energy by eating other organisms.

• Consumer

• Producer

• Decomposer

• Detritivore

What is a keystone species?

• A species that helps to hold an ecosystem together

• A species that lives in or around rocks

• All animals are keystone since all animals are important to an ecosystem

• Animals that keep other population numbers normal

When wolves were absent from the Yellowstone food web, what type of trophic cascade did their absence cause?

• top-down

• bottom-up

• neither

Bacteria, fungi, and earthworms are examples of: 

• scavengers
• predators
• prey
• decomposers

If the grasshopper were to be removed completely from the food web, what organism would be most effected?

• The squirrel
• The shrew
• The deer
• The rabbit

Which organism recieves the least amount of energy from the producer?

• Owl
• Grasshopper
• Lilypad
• Mouse

Which animal is the keystone species in this food web?

• Krill

• Squid

• Leopard seas

• Sperm Whales

If producers in this food web have 2,000kCal of energy, how much of that would end up going to the herring (secondary consumers)?

• 200 kCal

• 20 kCal

• 2 kCal

• 0.2KCal