Chapter 46

Which of the statements is true regarding atmospheric CO2 levels during the last 400,000 years? a) Atmospheric CO2 levels fluctuate periodically, with the highest levels occurring during interglacial periods b) Atmospheric CO2 levels fluctuate periodically, with the highest levels occurring during glacial periods c) Causation exists between low levels of atmospheric CO2 and high temperatures d) Atmospheric CO2 levels have remained relatively constant and have only increased since the 1800s e) Correlation exists between low levels of atmospheric CO2 and high temperatures

a) Atmospheric CO2 levels fluctuate periodically, with the highest levels occurring during interglacial periods

Which of the following does not remove CO2 from the atmosphere? a) Human b) Phytoplankton c) Moss d) Elm tree e) Kelp

a) Human

Which of these organisms can incorporate atmospheric carbon directly into C6H12O6, thereby playing a major role in a food web? a) Primary producers b) Carnivores c) Consumers d) Decomposers e) Grazers

a) Primary producers

The ocean, much like the atmosphere, can serve as a sink for man-made CO2. In fact, both Earth's atmosphere and the ocean store roughly equal amounts of man-made CO2. a) True b) False

a) True

The rate of respiration __________ throughout the year. a) remains more or less constant b) varies significantly

a) remains more or less constant

Which of the statements is true regarding CO2? a) CO2 is released as a product of respiration b) All of these choices are correct c) CO2 plays a vital role in maintaining Earth's temperature d)CO2 is a greenhouse gas e) CO2 can be produced by natural and man-made processes

b) All of these choices are correct

Photosynthesis and respiration both play a major role in the _________ carbon cycle and can affect atmospheric CO2 levels on a seasonal or annual basis. a) none of the other answer options is correct b) short-term c) long-term

b) Short-term

Decomposers are vital components of a food web because they: a) immediately provide tertiary consumers with usable forms of carbon b) return carbon (as CO2) to the atmosphere c) Serve as primary producers d) Incorporate the carbon contained in atmospheric CO2 into C6H12O6

b) return carbon (as CO2) to the atmosphere

Which of the equations is the chemical reaction for cellular respiration? a) C6H12O6 + 6CO2 -> 6O2 + 6H2O b) 6CO2 + 6H2O -> C6H12O6 + 6O2 c) CaSiO3 + CO2 -> CaSO3 + SiO2 d) C6H12O6 + 6O2 -> 6CO2 + 6H2O

d) C6H12O6 + 6O2 -> 6CO2 + 6H2O

In a pond, tadpoles eat algae and fish eat the tadpoles. Around the pond, grasshoppers eat grass and, at night, are preyed upon by bats. Other bats eat the fish that eat the tadpoles. In this community, the tadpoles are: a) tertiary consumers b) decomposers c) secondary consumers d) primary producers e) primary consumers

e) primary consumers