NAS2 Challenge Exam Questions With Verified Answers

NAS2 Challenge Exam Questions With Verified Answers Purpose of Scientific Method - answersolve a problem or answer a question Question, Hypothesis, Experiment, Observe & Record, Analyze, Conclude - answersteps of scientific method Independent variable - answera variable that stands alone and isn't changed by the other variables you are trying to measure, change or controlled example: age dependent variable - answera variable dependent on other factors, tested or measured example: test score - factors that go into a score you receive on a test control group - answerdoes not receive treatment and used to compare or measure the other subjects experimental group - answerexposed to changes in independent variable anatomy - answerbranch of science concerned with bodily structure of living organisms; structure physiology - answerscience dealing with the functions of living things or their organs level of organization - answerliving things arranged from the simplest to most complex are: organelle cells tissues organs organ systems, organism populations communities ecosystem biosphere requirements for life - answerCellular organization Reproduction Metabolism Homeostasis Heredity Response to stimuli Growth and development Adaptation through evolution survival needs - answerFood, oxygen, water, body temperature, atmospheric pressure (oxygen/carbon dioxide exchange) homeostasis - answerrelatively constant internal physical and chemical conditions that organisms maintain receptor - answersenses environmental stimulus and sends info to control center control center - answerhypothalamus signals effector effector - answerresponds to stimuli example: muscle contracting negative feedback mechanisms - answernet effect is that the original output of the system shuts off the original stimulus or reduces the intensity homeostasis negative feedback mechanisms - answermost common form of homeostasis, bringing people back to normal functioning negative feedback mechanisms - answerexample of homeostasis: adjustments of blood pressure, metabolism, body temp positive feedback mechanisms - answerform of homeostasis level of variable changes in same direction as initial change enhances or accelerates output created by activated stimulus