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NAS2 CHALLANGE QUESTIONS WITH VERIFIED ANSWERS
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NAS2 CHALLANGE QUESTIONS WITH VERIFIEDANSWERS 2024-2025
The scientific method aims to answer a question or solve a problem.
Question, Hypothesis, Experiment, Observe and Record, Analyze, and Conclude -
Steps of the Scientific Method
Independent variable - ANSWER a variable that stands alone and is unaffected by
the other variables you are attempting to measure, change, or control.
Example: age
ANSWER a variable that is dependent on other circumstances, tested or measured.
Example: test score - elements that go into a score you get on a test
The control group, which does not receive treatment, compares or measures the
other participants.
experimental group - ANSWER subjected to changes in independent variables.
Anatomy is the discipline of science that studies the physical structure of living
beings.
Physiology is the science that studies the functions of living organisms or their
organs.
,level of organization - ANSWER living things are organized from the simplest to
the most sophisticated.
organelle
cells
tissues
organs
Organ systems, organisms
Population communities
ecosystem
biosphere
prerequisites for life. - ANSWER Cellular Organization
Reproduction
Metabolism
Homeostasis
Heredity
Response to stimulus.
Growth and Development
Evolutionary adaptations
Survival requirements - ANSWER Food, oxygen, water, body temperature, and
atmospheric pressure (oxygen-carbon dioxide exchange)
, Homeostasis refers to the relatively consistent internal physical and chemical
conditions that organisms maintain.
receptor - ANSWER detects external stimuli and transmits data to the control
centre.
Control centre: hypothalamus
Signals effector
Effector - ANSWER reacts to stimuli.
example: muscular contraction
negative feedback systems - ANSWER net effect is that the original output of the
system shuts off the initial stimulus or diminishes its strength.
homeostasis
Negative feedback mechanisms are the most prevalent type of homeostasis,
restoring people to normal functioning.
negative feedback mechanisms - example of homeostasis: modifications of blood
pressure, metabolism, and body temperature
Positive feedback systems - ANSWER type of homeostasis
The level of the variable changes in the same direction as the initial change.
increases or accelerates output produced by the stimulated stimulus
Positive feedback systems are one example of a sort of homeostasis. Platelet
aggregation or buildup in reaction to injury or childbirth.
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