NAS 2 Challenge Exam TCC (Questions and
Answers) (Solved) (206 Qs) 2025!!!
Purpose of Scientific Method - solve a problem or answer a question
Question, Hypothesis, Experiment, Observe & Record, Analyse, Conclude - steps of scientific method
Independent variable - 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 - 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 - does not receive treatment and used to compare or measure the other subjects
experimental group - exposed to changes in independent variable
anatomy - branch of science concerned with bodily structure of living organisms, structure
physiology - science dealing with the functions of living things or their organs
level of organization - living things arranged from the simplest to most complex are:
organelle
cells
tissues
organs
organ systems, organism
populations communities
ecosystem
, biosphere
requirements for life - Cellular organization
Reproduction
Metabolism
Homeostasis
Heredity
Response to stimuli
Growth and development
Adaptation through evolution
survival needs - Food, oxygen, water, body temperature, atmospheric pressure (oxygen/carbon
dioxide exchange)
homeostasis - relatively constant internal physical and chemical conditions that organisms maintain
receptor - senses environmental stimulus and sends info to control center
control center - hypothalamus
signals effector
effector - responds to stimuli
example: muscle contracting
negative feedback mechanisms - net effect is that the original output of the system shuts off the
original stimulus or reduces the intensity
homeostasis
negative feedback mechanisms - most common form of homeostasis, bringing people back to normal
functioning
Answers) (Solved) (206 Qs) 2025!!!
Purpose of Scientific Method - solve a problem or answer a question
Question, Hypothesis, Experiment, Observe & Record, Analyse, Conclude - steps of scientific method
Independent variable - 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 - 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 - does not receive treatment and used to compare or measure the other subjects
experimental group - exposed to changes in independent variable
anatomy - branch of science concerned with bodily structure of living organisms, structure
physiology - science dealing with the functions of living things or their organs
level of organization - living things arranged from the simplest to most complex are:
organelle
cells
tissues
organs
organ systems, organism
populations communities
ecosystem
, biosphere
requirements for life - Cellular organization
Reproduction
Metabolism
Homeostasis
Heredity
Response to stimuli
Growth and development
Adaptation through evolution
survival needs - Food, oxygen, water, body temperature, atmospheric pressure (oxygen/carbon
dioxide exchange)
homeostasis - relatively constant internal physical and chemical conditions that organisms maintain
receptor - senses environmental stimulus and sends info to control center
control center - hypothalamus
signals effector
effector - responds to stimuli
example: muscle contracting
negative feedback mechanisms - net effect is that the original output of the system shuts off the
original stimulus or reduces the intensity
homeostasis
negative feedback mechanisms - most common form of homeostasis, bringing people back to normal
functioning
