Food Webs, Energy Pyramids & Succession Review

Which would be the appropriate term for an organism that eats a producer?

• scavenger
• decomposer
• secondary consumer
• primary consumer

Why is some energy not passed on to the next trophic level?

• The organisms at each level use about 90% of the available energy to live.
• The statement is NOT true.  All energy IS passed from one trophic level to the next.
• The organisms at each level use about 10% of the available energy to live.
• Most energy is absorbed by the soil instead.

The arrows in a food web…

• Point from predator to prey.
• Show the direction of energy flow in an ecosystem
• Always point from smaller to larger organisms.
• Always point from the larger to smaller organisms.

Which of the following best describes the small bird in the food web above?

• primary and secondary consumer
• secondary and tertiary consumer
• primary consumer only
• secondary consumer only

Which of the following would be the most likely effect, if there were a sudden increase in the cricket population?

• There would be a decrease in the small bird population.
• There would be a decrease in the grass/flowers population.
• There would be a decrease in the mice population.
• There would be an increase in the grass/flowers population.

Which organism(s) in the food web above can be described as quaternary consumers?

• owl, mosquito and mouse
• mouse only
• small bird and owl
• owl only 

Which organism has the most energy and which organism has the least amount of energy? Choose the best answer. 

• mosquito and grass
• mouse and grass
• grass and owl
• grass and small bird

If additional snakes are introduced into this ecosystem, there will most likely be an immediate decrease in the _________.  

• hawk population
• rabbit population
• wildflower population
• grass population

How many predators are in this food web?

• 7
• 3
• 4

In the food pyramid above, which organisms would capture the least amount of energy captured by the producers in their food chains?

• gopher snake
• yuccas
• fennec fox
• wild burro