Chapter 1 Quiz 1

A theory is

• an idea that has been proven
• a concept in the early stages that still needs to be tested
• a description of a belief that involves the supernatural
• an explanation of an idea that is broad in scope and supported by a large body of evidence

A hypothesis is

• the same as a theory
• a widely accepted idea about a phenomenon
• a proposed explanation for a set of observations
• an explanatory idea that is broad in scope and supported by a large body of evidence

True or False: All organisms have the ability to maintain a constant internal temperature

• True
• False

True or False: All organisms have the ability to respond to stimuli from the environment

• True
• False

True or False: All organisms have the ability to reproduce

• True
• False

A scientist performs a controlled experiment. This means that:

• one experiment is performed, but the scientists controls the variables
• the experiment is repeated many times to ensure that the results are inaccurate
• the experiment proceeds at a slow pace to guarantee that the scientists can carefully observe all the reactions
• two experiments are conducted, one differing from the other by only a single variable

All organisms belonging to the kingdom Plantae

• are unicellular and lack a nucleus
• obtain food by decomposing the remains of dead organisms
• are photosynthetic
• are multicellular and lack a nucleus

The ultimate source of energy flowing into nearly all ecosystems is

• electricity
• sunlight
• wind
• radioactivity

To be scientifically valid, a hypothesis must be

• reasonable
• controlled
• testable and falsifiable
• part of a theory

True or False: Organisms evolve structures in response to needs

• True 
• False