Ecology Unit Review

What is the original source of almost all energy in most ecosystems?

• carbohydrates
• sunlight
• water
• carbon

How much energy is passed on to each trophic level in an energy pyramid?

• 10%
• 90%
• 50%
• 80%

Which organisms have the most available energy in an energy pyramid?

• Producer
• Consumer
• Decomposer
• Scavenger

Which marine organism is considered a producer?

• Phytoplankton

• Zooplankton

• Small fish

• Whales

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

In this food web, which two organisms could be harmed if the mouse population were to decrease?

• Deer and caterpillar
• Wolf and snake
• Oak and grass
• Hawk and songbird

In the energy pyramid here, how much of the energy in each level gets LOST as heat or used by the organism for survival?

• 80%
• 90%
• 10%
• 20%

If there are 1000 Kcal of energy available at the producer trophic level, how much energy is available to the herbivores?

• 10 Kcal

• 1 Kcal

• 100 Kcal

• 1000 Kcal

If these organisms were arranged in a food pyramid, which organism would have the least amount of total energy available?

• coyote
• insect
• lizard
• shrub

Based on the food web shown above, which of the following is most likely responsible for the rabbit population trend as shown in the graph? 

• increase in amount of grass
• decrease in amount of grass
• overpopulation in squirrel population
• increase in rabbit population