NAS 2 CHALLENGE TEST Questions And Answers 100% Verified.
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NAS 2 CHALLENGE
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NAS 2 CHALLENGE
NAS 2 CHALLENGE TEST Questions And Answers 100% Verified.
purpose of the scientific method - correct answer. an organized way to solve a problem or answer a question
independent variable - correct answer. a variable that the researcher controls and is not affected by other varia...
NAS 2 CHALLENGE TEST Questions And
Answers 100% Verified.
purpose of the scientific method - correct answer. an organized way to solve a
problem or answer a question
independent variable - correct answer. a variable that the researcher controls and is
not affected by other variables
ex: amount of water a plant receives
What are the steps of the scientific method? - correct answer. 1. question
2. Hypothesis
3. experiment
4. observation
5. analyze
6. conclusion
dependent variable - correct answer. a variable that depends on other factors or
variables
ex: how much the plant grows
control group - correct answer. group that does not receive any treatment and is used
to compare or measure the other subjects
experimental group - correct answer. group that receives treatment in an experiment
what are the six levels of organization - correct answer. chemical, cellular, tissue,
organ, organ system, organism
identify the requirements of life - correct answer. response to stimuli, reproduction,
metabolism, cellular organization, regulation, growth and development, homeostasis
define homeostasis - correct answer. body maintains a stable internal environment
while adjusting to external conditions
Receptor - correct answer. a sensor that monitors the environment and responds to
changes (called stimuli) by sending the information to the control center
control center - correct answer. determines the set point (level or range a variable is to
be maintained at), analyzes the information it receives, and determines the appropriate
response.
effector - correct answer. provides the means for the control center's response to the
stimulus
negative feedback mechanisms - correct answer. a feedback mechanism that slows
or stops a process. Reduces the effect of the stimulus which decreases productivity
ex: the control of blood sugar
positive feedback mechanisms - correct answer. a feedback mechanism that results in
the enhancement of the original stimulus so the activity is accelerated
ex: childbirth (if childbirth takes too long the life of the mother and baby are at risk)
protons - correct answer. positive, in the nucleus
electron - correct answer. negatively charged particle in the outer shell
neutron - correct answer. neutral charge, in the nucleus
number of protons is the same as? - correct answer. the number of electrons
what is the atomic number equal to - correct answer. number of protons (atomic
number is top left above atomic symbol)
atomic mass - correct answer. the same as the protons and neutrons added together
(at the bottom below atomic symbol)
characteristics of ionic bonds - correct answer. between metal and nonmetal, high
melting and boiling points, generally solid at room temp, hard/brittle, conducts electricity,
dissolves in water, gives up one or more electrons to another atom
characteristics of covalent bonds - correct answer. between nonmetal
only(metalloids), atoms share electrons, lower melting and boiling point, usually liquid
and gas at room temp, soft, not a conductor of electricity, insoluble (don't dissolve)
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