Osmosis in Potato Samples

The video tutorial demonstrates an osmosis experiment using potato cylinders to observe the effects of different sucrose solution concentrations. The process involves preparing potato samples, measuring their initial lengths and masses, and immersing them in distilled water and sucrose solutions. After 24 hours, the changes in mass and length are recorded and analyzed. The tutorial explains how to calculate percentage changes and interpret the results, highlighting the principles of osmosis and the impact of solution concentration on plant tissue.

Why is it important to use potato cylinders of the same diameter in the osmosis experiment?

• To prevent them from floating

• To allow for easier comparison of results

• To make the experiment look neat

• To ensure they fit in the test tubes

What is the purpose of cutting off the potato skin before the experiment?

• To reduce the weight of the potato

• To allow water to move in and out of the tissue

• To make it easier to measure

• To make the potato look better

What is the significance of using a top pan balance with two decimal places?

• To ensure precise mass measurements

• To measure the length accurately

• To make the experiment faster

• To reduce the cost of the experiment

Why is distilled water used as one of the solutions in the experiment?

• It makes the potato taste better

• It speeds up the experiment

• It is a control to compare other solutions against

• It is cheaper than other solutions

What change is observed in the potato sample placed in distilled water after 24 hours?

• Increase in mass and length

• Decrease in mass and length

• No change in mass and length

• Only increase in mass

What is the observed effect of the 0.25 molar sucrose solution on the potato sample?

• Significant increase in mass

• Significant decrease in mass

• Slight increase in mass

• No change in mass

How does the potato sample in the 0.5 molar sucrose solution differ from the others?

• It becomes more rigid

• It remains unchanged

• It increases in length

• It shows a decrease in mass

What calculation is used to compare the results of the potato samples more effectively?

• Percentage change

• Average mass

• Volume change

• Total length

What does a negative percentage change in mass indicate?

• An increase in mass

• An error in measurement

• A decrease in mass

• No change in mass

What does the point where there is no change in mass on the graph indicate?

• The maximum mass of the potato

• The sugar concentration in the potato

• The end of the experiment

• The start of osmosis