Cell Theory and Scientific Experiments

Cell theory originally had three main components: - All living organisms are composed of __________. - The cell is the ________________. - All cells arise from ______________________.

• atoms, cells, tissues

• molecules, tissues, organs

• cells, basic unit of life, pre-existing cell

How are scientific theories formed? From __________ gained by many experiments of many scientists.

• new empirical data

• random guesses

• unverified assumptions

• personal beliefs

Tags

NGSS.HS-PS1-2

NGSS.HS-PS2-1

What is the dependent variable in the experiment? The __________________ of the independent variable.

• outcome

• cause

• control

• variable

Tags

NGSS.MS-PS3-4

______________ independent variable should be changed or manipulated in a correctly performed scientific experiment.

• only one

• two

• three

• none

What is the control group in the experiment? The control group does not receive the __________________________.

• independent variable

• dependent variable

• placebo

• treatment

In a line graph, the independent variable will be on the ________ and the dependent variable will be on the ________.

• Y- axis, x-axis

• x- axis, y-axis

• z-axis, w-axis

Tags

NGSS.MS-PS3-1

Why is random sampling important in conducting surveys? While a random sample is ______________________, you do not always get the results you hoped for.

• more expensive

• less biased

• difficult to analyze

The process of photosynthesis is essential in the __________________________ cycle. Photosynthesis ____________ carbon dioxide from the atmosphere and __________________ oxygen into the atmosphere.

• oxygen/carbon dioxide, removes, releases

• oxygen/carbon dioxide, releases, removes

Tags

NGSS.HS-LS2-5

Photosynthesis takes ______ from the atmosphere, so it ____________ CO₂ in the atmosphere.

• O₂, reduces

• CO₂, reduces

• CO₂, increases

• O₂, increases

Tags

NGSS.HS-LS2-5

______________________________ results in the release of CO₂ to the atmosphere.

• Respiration

• Photosynthesis

• Evaporation

• Condensation

Tags

NGSS.HS-LS1-7