Question

1. If a single-celled saltwater organism is placed in freshwater, it will not be able to survive. Which statement explains why this is true?
A. The organism’s cell will absorb too much water through osmosis.
B. The organism’s cell will release too many hydrogen ions through diffusion.
C.The organism’s cell will release too much water through facilitated diffusion.
D. The organism’s cell will absorb too many sodium ions through osmosis.

2.Which must be true of any scientific hypothesis?
A must be testable
B must undergo peer review
C must be approved by professionals
D must be proven correct by research

Answer 1

Answer:

1. The correct answer would be A. The organism’s cell will absorb too much water through osmosis.

If a single-celled salt water organism is placed in freshwater, then the freshwater would act as hypotonic solution (low solute concentration) as compared to the cytoplasm of the cell.

Consequently, water from outside will move into the single-celled organism by the process of osmosis. Excess of water can result in the bursting of the cell. Hence, it can not survive in the fresh water.

2. The correct answer would be A must be testable.

A scientific hypothesis refers to the proposed or possible explanation for occurrence of any phenomenon.

For example, occurrence of cold can be reduced by consuming vitamin C.

A scientific hypothesis must be testable and falsifiable.

There should be a scientific method(s) or observations which could agree or disagree with the proposed hypothesis.