Multiple choice
Why are decomposers part of the nitrogen cycle?
A. because decomposers break down sugar into usable energy for cell functions
B. because decomposers break down wastes and dead things to return proteins to the soil
C. because decomposers return nitrogen compounds back to the soil for plants
C. because decomposers return nitrogen compounds back to the soil for plants
In the nitrogen cycle, how is nitrogen changed into nitrogen compounds?
A. Bacteria and fungi break down dead things, nitrogen, and wastes into nitrogen compounds.
B. Some bacteria and lightning can change nitrogen into nitrogen compounds.
C. Some fungi and lightning can change nitrogen into nitrogen compounds.
B. Some bacteria and lightning can change nitrogen into nitrogen compounds.
God uses cycles to maintain His earth, so _______.
A. it changes in the amount of precipitation a lot.
B. Earth has regular cycles of change.
C. it changes in average temperature each year.
B. Earth has regular cycles of change.
In an ecosystem, an invasive organism can cause ________________.
A. many changes in a succession.
B. of laws regulating overhunting.
C. harm when the organism is introduced.
C. harm when the organism is introduced.
What two stresses have a definite beginning and ending?
A. drought
B. fire
C. flood
B and C
What states of matter can precipitation fall as?
A. gas or liquid
B. gas or solid
C. liquid or solid
C liquid or solid
In the carbon and oxygen cycles, what is one difference between cellular respiration and photosynthesis?
A. Cellular respiration adds carbon dioxide to the atmosphere. Photosynthesis removes it from the atmosphere.
B. Cellular respiration removes carbon dioxide from the atmosphere. Photosynthesis adds it back to the atmosphere.
C. Cellular respiration produces oxygen and sugar molecules. Photosynthesis produces carbon dioxide and sugar molecules.
A. Cellular respiration adds carbon dioxide to the atmosphere. Photosynthesis removes it from the atmosphere.
A. it changes in average temperature each year.
B. it changes in both the amount of precipitation and average temperature.
C. it changes in the amount of precipitation a lot.
A. it changes in average temperature each year.
The puffin population is increasing because ______________.
A. many changes in a succession.
B. of laws regulating overhunting.
C. to reduce habitat destruction.
B. of laws regulating overhunting
What are two ways natural stresses can benefit the earth?
A. Some natural stresses can put and ecosystem back in balance.
B. Some natural stresses recycle nutrients into the soil.
C. All natural stresses distribute fertile soil by water.
D. All natural stresses help seeds sprout.
A and B
During cellular respiration, what do cells use oxygen for?
A. to break down sugar into usable energy
B. to change nitrogen gas into nitrogen compounds
C. to form sugar molecules and oxygen
A. to break down sugar into usable energy
Which organism is considered to be threatened?
A. The Asian elephant population is small and in danger of not existing.
B. The banded sunfish population could become in danger of not existing soon.
C. The Chile sandalwood tree no longer exists in the wild.
B. The banded sunfish population could become in danger of not existing soon.
If an area has spring, summer, autumn, and winter seasons, _____________________.
A. it changes in average temperature each year
B. it changes in both the amount of precipitation and average temperature
C. it changes in the amount of precipitation a lot
A. it changes in average temperature each year
One benefit of the stress of a fire is ________________.
A. they are part of the cycles of matter and change.
B. that nutrients are recycled into the soil.
C. to reduce overfishing
B. that nutrients are recycled into the soil.
Which two stresses are man-made?
A. drought
B. flood
C. habitat destruction
D. overfishing
C and D
In the carbon and oxygen cycles, what do plants need for photosynthesis?
A. water, carbon dioxide, and nitrogen
B. water, carbon dioxide, and the sun's energy
C. water, oxygen, and the sun's energy
B. water, carbon dioxide, and the sun's energy
What is the job of an aquatic ecologist?
A. to design, create, and test materials to make new products
B. to study the plants and animals that live in or near the water
C. to use an understanding of chemical changes in matter
B. to study the plants and animals that live in or near the water
If an area has wet and dry seasons, ________________.
A. it changes in average temperature each year
B. these areas have wet and dry seasons.
C. it changes in the amount of precipitation a lot
C. it changes in the amount of precipitation a lot
People add fish ladders to dams _____________.
A. because of laws regulating overhunting
B. to reduce overfishing.
C. to reduce habitat destruction.
C. to reduce habitat destruction.
During what two processes of the water cycle does the state of matter change from a liquid to a gas?
A. condensation
B. evaporation
C. precipitation
D. transpiration
B and D
What gas makes up most of the earth's atmosphere?
A. carbon dioxide
B. nitrogen
C. oxygen
B. nitrogen
What is one way that a flood and a drought are different?
A. A drought is more likely to cause fires than a flood is.
B. A drought erodes the topsoil, but a flood does not.
C. A drought destroys crops, but a flood does not.
A. A drought is more likely to cause fires than a flood is.
Monsoons blow across the water and the land, so ______________.
A. these areas have wet and dry seasons.
B. Earth has regular cycles of change.
C. it changes in the amount of precipitation a lot.
A. these areas have wet and dry seasons.
Natural and man-made stresses can cause _____________.
A. many changes in a succession.
B. of laws regulating overhunting.
C. harm when the organism is introduced.
A. many changes in a succession.
God created each cycle to depend on the other cycles. In what two ways do the other cycles depend on the water cycle?
A. In the carbon and oxygen cycles, the water cycle is needed for photosynthesis.
B. In the nitrogen cycle, nitrogen compounds are made available to plants through precipitation.
C. In the seasonal cycle, leaves fall and bacteria break them down to form nitrogen compounds, adding nutrients to the soil.
D. In the nitrogen, oxygen, and carbon cycles, animals get proteins, nitrogen, and carbon by eating plants and other animals.
A and B