quiz 18 Flashcards

1
Q

How can we use the osmosis investigation to determine the concentration of plant cells?

A

By finding the concentration of sugar/salt solution where the plant cells do not lose or gain mass

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2
Q

What is the relationship between the surface area of the membrane and rate of diffusion?

A

As the surface area of the membrane increases, the rate of diffusion increases

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3
Q

When investigating the effect of sugar solution on osmosis in potato cylinders, what are some control variables

A

volume of sugar solution, length of potato cylinders and temperature of solutions

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4
Q

Which of diffusion or active transport requires energy?

A

active transport

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5
Q

Define diffusion

A

the movement of particles from an area of high concentration to an area of low concentration

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6
Q

What is the meaning of rate of diffusion?

A

How quickly does diffusion take place

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7
Q

What is osmosis?

A

the movement of water molecules from a dillute to concentrated solution through a partially permeable membrane

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8
Q

What 3 factors can affect the rate of diffusion?

A

temperature, surface area and concentration gradient

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9
Q

What is the formula to calculate percentage change in mass?

A

final mass - initial mass /initial mass x 100

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10
Q

Why do we need to dry the potato cylinders before measuring their mass?

A

To remove the excess water, which can affect the results

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11
Q

What is partially permeable membrane?

A

a membrane that allows some molecules thorugh

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12
Q

Give an example of a substance that commonly moves into cells

A

oxygen and glucose

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13
Q

When investigating the effect of sugar solution on osmosis in potato cylinders, what is the dependent variable?

A

change in mass of potato cylinders

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