AnswersFL-2000310-Biology 1 AUnit Test

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The classification system for organisms has changed from seven levels to eight. This happened because

A
scientific consensus changed as scientists learned more about organisms.
B
scientists did not test the seven-level system often enough to lead to consensus.
C
the eight-level system of classification is an emerging idea that needs more testing.
D
the seven-level system of classification was not supported by scientists.
22
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An experiment is performed to test the effect of three different types of water on the growth of a plant. The test is done by using tap water, distilled water, and carbonated water. Choose the statement below that describes the tap water in this experiment.

A
The tap water is a controlled variable for all plants.
B
The tap water is the control group for comparison.
C
Tap water is the only test condition that will cause changes in the dependent variable.
D
Tap water is one of the three test conditions of the independent variable, the type of water.
23

Take a look at the statement below:Fish meal is better than artificial fertilizers.How could this statement be revised to make it a hypothesis?

A
Fish meal is safer than artificial fertilizers, but it does not make plants grow.
B
Fish meal is a better fertilizer than artificial fertilizer because fish meal is natural.
C
Plants that are fertilized with fish meal will grow taller than plants that receive artificial fertilizer.
D
Plants that receive artificial fertilizer will be better than plants that receive fish meal.
24

To test the effectiveness of a new nutrient supplement, one group of identical mice is given the supplement, and the other group is not given anything. Which is the most complete list of the parts of an experiment presented in this scenario?

A
independent variable, dependent variable
B
control group, experimental group, dependent variable
C
independent variable, control group, experimental group
D
control group, experimental group
25

Density is mass per unit of volume. Which pair of lab instruments would a student use to measure the density of seawater?

A
a caliper and a flask
B
a stopwatch and a beaker
C
a balance and a beaker
D
a meter stick and a temperature probe

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