Ch 4 Interacting with the Biosphere

During the water cycle, water from underground reservoirs can seep into

• lakes

• springs

• oceans

• all of these

Most free oxygen in the earth's atmosphere is released by

• burning fossil fuels

• decomposing organic matter

• photosynthesis in plants and algae

• volcanic eruptions

_____________ is when water exits the leaves of plants.

• condensation

• boiling

• precipitation

• transpiration

Most of the earth's carbon is trapped in the

• atmosphere

• ocean

• underground

• the ocean and underground

Nitrogen must be ___________ or converted into an organic form so plants and animals can use it.

• synthesized

• absorbed

• fixed

• titrated

Nitrogen can be fixed by

• lightning strikes

• bacteria in the soil

• bacteria in the roots of legumes

• all of these

Humans get nitrogen from

• breathing air

• eating food

• bacteria digesting food in their intestines

• taking vitamins

An algae bloom is an example of ____________ growth

• logistic

• exponential

• explosive

• successive

The size of a population that a given habitat can support is its _______________.

• stable point

• population density

• carrying capacity

• limiting factor

Which of these is considered a greenhouse gas?

• carbon dioxide

• water vapor

• methane

• all of these