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3. A scientist is doing an experiment to see which con-
Module 0 PREP FOR THE AP EXAM ditions are best for bacterial growth. The scientist
®
®
AP Practice Questions has set up an array of several petri dishes and will

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subject the bacterial cultures to various cool and
warm temperatures, while comparing them to petri
Section 1: Multiple-Choice Questions dishes at room temperature. Identify how the condi-
Choose the best answer for questions 1–4.
tion of temperature is used in this experiment.
1. Survival in some mushroom species is enhanced (A) As a dependent variable
by the presence of gills with large surface areas. (B) As an independent variable
Mushrooms with larger gill surface areas produce (C) As a control group
more spores and reproduce more successfully than (D) As an experimental group
those with smaller gill surface areas in a particular
environment. Identify which of the four Big Ideas 4. The table below shows differences in mass among
of biology this example best describes. males in four different species of frogs at two different
(A) Evolution life stages. A metamorph is a young individual that
(B) Energetics has nearly completed the change from tadpole to frog.
Metamorphs have four legs and still have a tail. A fully
(C) Information Storage and Transmission
grown adult frog has no tail.
(D) Systems Interactions
2. A student accidentally spilled a bag of rock salt on Metamorph mass (g) Adult mass (g)

some plants while moving the bag to the garage. After
some time, the student noticed that the plants in this Green frog 1.1 20.2
area were turning brown and withering. The student Leopard frog 0.98 18.9
formulated a hypothesis that the plants were dying Wood frog 0.82 7.9
because they do not grow well in salty soil. Among the Gray tree frog 0.57 7.1
proposed experiments below, identify the most effec-
tive way of testing this hypothesis.
Which species has the largest percent change in mass
(A) Keeping a weekly record of any plant regrowth
from metamorph to adult?

(B) Planting some seeds in a container of healthy
soil and some in a container of salty soil and (A) Green frog
observing plant growth in each over a period (B) Leopard frog
of weeks (C) Wood frog
(C) Removing the rock salt from the area, (D) Gray tree frog

replanting grass seed, and observing any change
in growth

(D) Spreading rock salt over a larger portion of the lawn
to see if the rest of the grass dies

16 Unit 1 chemIstry of LIfe

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02_morrisapbiology1e_11331_Unit1_Mod0_01-19_3pp.indd 16 10/04/21 9:09 AM