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Life Science Midterm Review
Test Description: Various topics- review for 7th grade midterm test
Instructions: Answer all questions to get your test result.
1) Energy from the sun changes liquid water into water vapor
A
precipitation
B
evaporation
C
condensation
D
nitrogen fixation
2) What is a major cause of global warming?
A
solar panels
B
increasing numbers of plants producing carbon dioxide
C
burning of fossil fuels
D
decreasing carbon dioxide in the atmosphere
3) What living things break down dead things in order to recycle the materials back into the environment?
A
plants
B
bacteria
C
algae
D
people
4) Which level of the energy pyramid is always plants?
A
the bottom (largest energy level)
B
it depends on the ecosystem, sometimes it's the middle sometimes it's the top
C
the top (smallest energy level)
D
plants are always the first level of consumers in an energy pyramid, becuase the cannot make their own food.
5) When might a population stabalize? (become relatively constant)
A
When limiting factors effect population growth (ex- food or space are limited)
B
when more organisms are being born then are moving into an area
C
when more of the organisms are dying than are being born.
D
increase in predators make the population stay the same
6) Which human impacts are least likely to effect an ecosystem in a negative way?
A
increasing the number of people in that ecosystem
B
recycling bottles and cans
C
dumping trash into a landfill
D
using fossil fuels like gasoline
7) The manipulated variable is also called
A
the dependent variable
B
the observation
C
the constant variable
D
the independent variable
8) The responding variable is also called...
A
the control variable
B
the dependent variable
C
the independent variable
D
the constant variable
9) Cooled vapor turns back into tiny drops of liquid water.
A
condensation
B
precipitation
C
evaporation
D
nitrogen fixation
10) Rain, snow, sleet, or hail... heavy droplets of water fall to the earth
A
precipitation
B
evaporation
C
nitrogen fixation
D
condensation
*select an answer for all questions
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