Ch. 46- Bio

What can Antarctic ice core samples tell us about atmospheric CO2 levels? Select all that apply. -CO2 ice core data confirm CO2 measurements taken directly from the atmosphere. -Ice cores can tell scientists exactly what plants lived on Earth centuries ago. -Nothing can be learned about CO2 levels from Antarctic ice cores, because ice is made of H2O and not CO2. -Ice cores can help scientists estimate atmospheric CO2 levels from hundreds of thousands of years ago.

-CO2 ice core data confirm CO2 measurements taken directly from the atmosphere -Ice cores can help scientists estimate atmospheric CO2 levels from hundreds of thousands of years ago.

Which of the answer choices are reservoirs of carbon? Select all that apply. -burning wood -soil -the atmosphere -oceans -organisms

-soil -the atmosphere -oceans -organisms

Because energy transfer is not 100% efficient across trophic levels, an average of about _____ of energy and biomass available at one trophic level is available at the next.

10%

Which of the statements is an accurate reflection of photosynthesis and chemical weathering? -Both processes are typically associated with the long-term carbon cycle. -Both processes are typically associated with the short-term carbon cycle. -Both processes release CO2 as a product; that is, they increase atmospheric CO2 levels. -Both processes use CO2 as a reactant; that is, they decrease atmospheric CO2 levels.

Both processes use CO2 as a reactant; that is, they decrease atmospheric CO2 levels.

Which of the equations is the chemical reaction for cellular respiration?

C6H12O6 + 6O2 → 6CO2 + 6H2O

Photosynthesis and respiration both play a major role in the _____ carbon cycle and can affect atmospheric CO2 levels on a seasonal or annual basis.

Short-term

How can scientists distinguish among different sources of CO2 in the atmosphere?

The amount of different carbon isotopes in the CO2 differs based on the source.

A _____ depicts the flow of carbon through an ecosystem, whereas a _____ depicts the transfer of energy.

food web; trophic pyramid

Over the last several decades, what have researchers discovered about atmospheric CO2 levels?

increased

Recall that in the northern hemisphere, atmospheric CO2 levels are highest in early spring and lowest in early fall. What accounts for this seasonal fluctuation in atmospheric CO2 levels?

photosynthesis