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NAS2 Challenge Exam – Questions & Answers
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NAS2 Challenge Exam – Questions & Answers
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NAS2 Challenge Exam – Questions & AnswersPurpose of Scientific Method ✔️Ans - solve a problem or answer a
question
Question, Hypothesis, Experiment, Observe & Record, Analyze, Conclude
✔️Ans - steps of scientific method
Independent variable ✔️Ans - 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 ✔️Ans - a variable dependent on other factors,
tested or measured
example: test score - factors that go into a score you receive on a test
control group ✔️Ans - does not receive treatment and used to compare
or measure the other subjects
experimental group ✔️Ans - exposed to changes in independent variable
anatomy ✔️Ans - branch of science concerned with bodily structure of
living organisms; structure
physiology ✔️Ans - science dealing with the functions of living things or
their organs
level of organization ✔️Ans - living things arranged from the simplest to
most complex are:
organelle
cells
tissues
organs
organ systems, organism
populations communities
, ecosystem
biosphere
requirements for life ✔️Ans - Cellular organization
Reproduction
Metabolism
Homeostasis
Heredity
Response to stimuli
Growth and development
Adaptation through evolution
survival needs ✔️Ans - Food, oxygen, water, body temperature,
atmospheric pressure (oxygen/carbon dioxide exchange)
homeostasis ✔️Ans - relatively constant internal physical and chemical
conditions that organisms maintain
receptor ✔️Ans - senses environmental stimulus and sends info to
control center
control center ✔️Ans - hypothalamus
signals effector
effector ✔️Ans - responds to stimuli
example: muscle contracting
negative feedback mechanisms ✔️Ans - net effect is that the original
output of the system shuts off the original stimulus or reduces the intensity
homeostasis
negative feedback mechanisms ✔️Ans - most common form of
homeostasis, bringing people back to normal functioning
negative feedback mechanisms ✔️Ans - example of homeostasis:
adjustments of blood pressure, metabolism, body temp
positive feedback mechanisms ✔️Ans - form of homeostasis
level of variable changes in same direction as initial change
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