Unit 7 Biology Test

A group of eagles living around Lake Tahoe would be considered a

population

Fish, their predators, and the water, sunlight, and plants that they rely on would be considered an

ecosystem

Which of the following is NOT a characteristic of a living thing

moves around

A field of sunflowers facing towards the sun is an example of

response to stimuli

If an organism divides and produces an exact copy of itself, the organism

has reproduces asexually

What is one biotic factor that affects the size of a population in an ecosystem

the number of predators present

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

Carbon dioxide

In the carbon cycle, decomposers return carbon to the soil. Which of the following is NOT something that decomposers can break down

Carbon dioxide found in the air

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

combustion from driving cars

Nitrogen in the air must be “fixed” before it can be used by plants. Atmospheric nitrogen is “fixed” by

bacteria

When deforestation (cutting down trees) occurs in an area, what immediate effect does this have on the water cycle?

less is returned to the air by transpiration

The main result of photosynthesis is

CO2 is removed and captured by plants.

Bacteria are involved in many steps of the biochemical cycles. Which of the following steps in bacteria is NOT involved

Transpiration

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

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

transpiration

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

Decomposers

evaporation

rising from lake

infiltration

absorbed underground

condensation

forming clouds

transpiration

rising from trees

precipitation

falling from the sky

run-off

moving down incline

Denifriciation

Name the process of returning nitrogen to the atmosphere

In what two ways can animals contribute nitrogen back into the soil

feces, when the animal dies

What would happen to the nitrogen cycle is decomposers were not present

no nitrogen would be put into the soil by dead animals