Georgia Science Grade 7

Chapter 1: Exploring and Classifying Life

CRCT Practice

1
What scientist used the flasks pictured to support the theory of biogenesis?

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A)John Needham
B)Louis Pasteur
C)Lazzaro Spallanzani
D)Francesco Redi
2
Why did only the broth in the flask that was tilted become cloudy and contaminated?

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A)The broth was not boiled.
B)Flies contaminated the broth.
C)The broth was exposed to dust in the neck of the flask.
D)Decaying meat caused the broth to be contaminated.
3
A prediction that can be tested is a
A)conclusion.
B)variable.
C)hypothesis.
D)theory.
4
Which of the following units would a scientist likely use when measuring the length of a mouse's tail?
A)kilometers
B)millimeters
C)grams
D)milliliters
5
The dog pictured above has increased in size. How did most of this size increase take place?

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A)an increase in cell size
B)an increase in the number of cells
C)an increase in cell water
D)an increase in cell energy
6
What characteristic of life is illustrated by the change in the dog?

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A)reproduction
B)homeostasis
C)growth and development
D)response to stimulus
7
What gas must most organisms take in to release the energy of foods?
A)oxygen
B)carbon dioxide
C)water vapor
D)hydrogen
8
What characteristic of living things is represented by a puffball releasing millions of spores?
A)reproduction
B)development
C)organization
D)use of energy
9
When using scientific methods to solve a problem, which of the following is a scientist most likely to do after forming a hypothesis?
A)analyze data
B)draw conclusions
C)state a problem
D)perform an experiment
10
What are the smallest units that make up your body called?
A)cells
B)organisms
C)muscles
D)fibers
11
A science class set up the experiment above to study the response of plants to the stimulus of light.What hypothesis is likely being tested by this experiment?

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A)plants are unaffected by light
B)plants do not need light
C)plants grow away from light
D)plants grow towards light
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