NAS2 Challenge Exam Questions and Verified Solutions 2024
Purpose of Scientific Method - Answer -solve a problem or answer a question Question, Hypothesis, Experiment, Observe & Record, Analyze, Conclude - Answer -steps of scientific method Independent variable - Answer -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 - Answer -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 - Answer -does not receive treatment and used to compare or measure the other subjects experimental group - Answer -exposed to changes in independent variable anatomy - Answer -branch of science concerned with bodily structure of living organisms; structure physiology - Answer -science dealing with the functions of living things or their organs level of organization - Answer -living things arranged from the simplest to most complex are: organelle cells tissues organs organ systems, organism populations communities ecosystem biosphere 1 / 2
requirements for life - Answer -Cellular organization Reproduction Metabolism Homeostasis Heredity Response to stimuli Growth and development Adaptation through evolution survival needs - Answer -Food, oxygen, water, body temperature, atmospheric pressure (oxygen/carbon dioxide exchange) homeostasis - Answer -relatively constant internal physical and chemical conditions that organisms maintain receptor - Answer -senses environmental stimulus and sends info to control center control center - Answer -hypothalamus signals effector effector - Answer -responds to stimuli
example: muscle contracting
negative feedback mechanisms - Answer -net effect is that the original output of the system shuts off the original stimulus or reduces the intensity homeostasis negative feedback mechanisms - Answer -most common form of homeostasis, bringing people back to normal functioning negative feedback mechanisms - Answer -example of homeostasis: adjustments of blood pressure, metabolism, body temp positive feedback mechanisms - Answer -form of homeostasis level of variable changes in same direction as initial change enhances or accelerates output created by activated stimulus
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