NAS2 CHALLENGE ACTUAL EXAM PAPER 2026
QUESTIONS WITH ANSWERS GRADED A+
● Question, Hypothesis, Experiment, Observe & Record, Analyze,
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
QUESTIONS WITH ANSWERS GRADED A+
● Question, Hypothesis, Experiment, Observe & Record, Analyze,
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
