Carbon cycle & climate change

Organisms, such as plants or phytoplankton that carry out photosynthesis, would cause a decrease of which gas in the atmosphere?

• oxygen

• carbon dioxide

• water

• ozone

Which of the following is NOT something that decomposers can break down in the carbon cycle?

• waste products like urine or feces

• the bodies of dead plants and animals

• carbon dioxide found in the air

• scraps of discarded food

Humans increase carbon dioxide in the atmosphere, and contribute to the carbon cycle by

• combustion from driving cars

• planting trees to improve photosynthesis

• conserving energy with alternative energies

• using more solar power electricity

When deforestation occurs in an area, what immediate effect does this have on the water cycle?

• more water is returned to the atmosphere by transpiration

• there is less runoff water, but more transpiration

• more photosynthesis occurs, and CO2 begins decreasing

• less water is returned to the air by transpiration

Which of the following is common to the carbon cycle, the nitrogen cycle, and the water cycle?

• the substances are rearranged into different types of molecules as they move through their cycles

• the substances must pass through organisms in order to complete their cycles

• the largest reserves of these substances are always in organisms

• these substances are required by all living things and are involved in many processes that occur in all living things

Water can be returned to the atmosphere through the leaves of plants by

• evaporation

• condensation

• precipitation

• transpiration

For the carbon cycle and the nitrogen cycle to function properly, which organisms must ALWAYS be present?

• decomposers

• herbivores

• parasites

• predators

What pattern of growth will a population with limited resources show?

• exponential growth with no carrying capacity

• logistic growth with a carrying capacity

• density-dependent

• density-independent

Which of the following is TRUE of density-dependent limiting factors?

• they have a larger impact on big populations

• they have a larger impact on small populations

• they impact big and small populations equally

• they tend to be caused by abiotic factors

Which of the following is true about carbon cycling?

• carbon is cycled between living organisms only

• carbon is cycled between heterotrophic organisms, only

• carbon is cycled between the living and nonliving components of the environment

• carbon is cycled between physical factors of the environment by the processes of condensation and evaporation