Learning Check 1 Practice Quiz

Which macromolecules contain carbon, hydrogen, and oxygen?

• Carbohydrates

• Proteins

• Lipids

• All of the above

As trophic level increases, available energy

• Increases

• Decreases

• Increases then decreases

• Stays constant

How much energy is moved from one trophic level to the next trophic level?

• 100%

• 1/2

• 10%

• 25%

How many calories will be passed on from 250 to the next trophic level?

• 2,500

• 25

• 2.5

• 10%

Use the diagram to answer the question.
The Mayfly is a food source for which 3 organisms?

• Frog, Dragon Fly and snake
• Frog, trout and dragon fly
• Frog, salamander and trout
• Frog and phytoplankton

Which of the following processes in the nitrogen cycle is where decomposers break down animal and plant proteins (from dead organisms) and waste to release energy, releasing a form of ammonium into the soil.

• NITROGEN-FIXATION

• DECOMPOSITION

• NITRIFICATION

• DINITRICATION

Which of the following processes in the nitrogen cycle is a process that converts atmospheric nitrogen into ammonia, which is absorbed by organisms. Performed by nitrogen-fixing bacteria.

• NITROGEN-FIXATION

• DECOMPOSITION

• NITRIFICATION

• DINITRICATION

Known as eutrophication, excess fertilizer runoff in aquatic ecosystems causes -

• too much oxygen in the water

• algae to die

• algal blooms

When humans burn fossil fuels, most of the carbon quickly enters the _______ as carbon dioxide

• water
• atmosphere
• sun
• air

Combustion is another word for

• burning
• melting
• exploding
• incinerating