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NAS2 CHALLENGE EXAM QUESTIONS
AND ANSWERS 2025
Purpose of Scientific Method - correct answer- solve a problem
or answer a question
Question, Hypothesis, Experiment, Observe & Record,
Analyze, Conclude - correct answer- steps of scientific method
Independent variable - correct answer- a variable that stands
alone and isn't changed by the other variables you are trying to
measure, change or controlled
example: age
dependent variable - correct answer- a variable dependent on
other factors, tested or measured
example: test score - factors that go into a score you receive on
a test
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control group - correct answer- does not receive treatment and
used to compare or measure the other subjects
experimental group - correct answer- exposed to changes in
independent variable
anatomy - correct answer- branch of science concerned with
bodily structure of living organisms; structure
physiology - correct answer- science dealing with the functions
of living things or their organs
level of organization - correct answer- living things arranged
from the simplest to most complex are:
organelle
cells
tissues
organs
organ systems, organism
populations communities
ecosystem
biosphere
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requirements for life - correct answer- Cellular organization
Reproduction
Metabolism
Homeostasis
Heredity
Response to stimuli
Growth and development
Adaptation through evolution
survival needs - correct answer- Food, oxygen, water, body
temperature, atmospheric pressure (oxygen/carbon dioxide
exchange)
homeostasis - correct answer- relatively constant internal
physical and chemical conditions that organisms maintain
receptor - correct answer- senses environmental stimulus and
sends info to control center
control center - correct answer- hypothalamus
NAS2 CHALLENGE EXAM QUESTIONS
AND ANSWERS 2025
Purpose of Scientific Method - correct answer- solve a problem
or answer a question
Question, Hypothesis, Experiment, Observe & Record,
Analyze, Conclude - correct answer- steps of scientific method
Independent variable - correct answer- a variable that stands
alone and isn't changed by the other variables you are trying to
measure, change or controlled
example: age
dependent variable - correct answer- a variable dependent on
other factors, tested or measured
example: test score - factors that go into a score you receive on
a test
,2 | Page
control group - correct answer- does not receive treatment and
used to compare or measure the other subjects
experimental group - correct answer- exposed to changes in
independent variable
anatomy - correct answer- branch of science concerned with
bodily structure of living organisms; structure
physiology - correct answer- science dealing with the functions
of living things or their organs
level of organization - correct answer- living things arranged
from the simplest to most complex are:
organelle
cells
tissues
organs
organ systems, organism
populations communities
ecosystem
biosphere
, 3 | Page
requirements for life - correct answer- Cellular organization
Reproduction
Metabolism
Homeostasis
Heredity
Response to stimuli
Growth and development
Adaptation through evolution
survival needs - correct answer- Food, oxygen, water, body
temperature, atmospheric pressure (oxygen/carbon dioxide
exchange)
homeostasis - correct answer- relatively constant internal
physical and chemical conditions that organisms maintain
receptor - correct answer- senses environmental stimulus and
sends info to control center
control center - correct answer- hypothalamus
