Osmosis Experiments

What two biological materials are commonly used in osmosis experiments?

Potato tissue and eggs without shells.

What happens to a shell-less egg in a hypertonic solution?

It crenates (shrinks) as water leaves the cell.

What happens to a shell-less egg in a hypotonic solution?

It swells as water moves into the cell.

Write the formula to calculate percentage change.

Percentage change = [(new value - old value) / old value] × 100.

Effect of a hypotonic solution on plant tissue mass and length.

Both increase.

Effect of a hypotonic solution on plant tissue firmness.

Becomes firm.

Effect of a hypertonic solution on plant tissue mass and length.

Both decrease.

Effect of a hypertonic solution on plant tissue firmness.

Becomes soft and wilted.

Effect of an isotonic solution on plant tissue mass and length.

No change.

Effect of an isotonic solution on plant tissue firmness.

No change.

Step 1 for measuring osmosis in plant tissue.

Cut uniform pieces of plant tissue such as potato or carrot.

Step 2 for measuring osmosis in plant tissue.

Record the initial mass and length of each piece.

Step 3 for measuring osmosis in plant tissue.

Place tissue in solutions of known, varying solute concentrations.

Step 4 for measuring osmosis in plant tissue.

After incubation, remove tissue, dry it, and measure final mass and length.

What variable is manipulated in the osmosis experiment?

The solute concentration of the solution.

What are two dependent variables measured in an osmosis experiment?

Change in mass and change in length of the tissue.

Why is it important to control variables like temperature and tissue size?

To ensure changes in mass are caused only by solute concentration differences.

Why are multiple trials needed in osmosis experiments?

To increase the reliability of results.

Which instruments ensure accurate measurement of mass and length?

A balance for mass and a ruler or caliper for length.