2.1 Supplying the cell

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Question 12

A student uses a potometer to investigate the rate of transpiration in a leafy shoot under different light intensities.

The student recorded the following distances moved by the gas bubble in one minute when the light source was placed at a distance of 30 cm:

Trial 1: $mm43\text{ mm}$
Trial 2: $mm47\text{ mm}$
Trial 3: $mm45\text{ mm}$

Explain why the student represented this set of results as $45 \pm 2\text{ mm}$ .

[3]

At a distance of 10 cm from the light source, the mean distance the gas bubble moved in one minute was $mm45\text{ mm}$ . The diameter of the narrow capillary tube in the potometer is $mm1.2\text{ mm}$ .

Calculate the volume of water taken up by the plant in one minute. Use the equation:

\text{Volume} = \pi r^2 l

where $r$ is the radius of the tube, $l$ is the distance the bubble moves, and $π=3.14\pi = 3.14$ .

Give your answer to 2 significant figures.

[4]

A student uses a potometer to investigate the rate of transpiration in a leafy shoot under different light intensities.

The student recorded the following distances moved by the gas bubble in one minute when the light source was placed at a distance of 30 cm:

Trial 1: $mm43\text{ mm}$
Trial 2: $mm47\text{ mm}$
Trial 3: $mm45\text{ mm}$

Explain why the student represented this set of results as $45 \pm 2\text{ mm}$ .

[3]

Calculate the volume of water taken up by the plant in one minute. Use the equation:

\text{Volume} = \pi r^2 l

where $r$ is the radius of the tube, $l$ is the distance the bubble moves, and $π=3.14\pi = 3.14$ .

Give your answer to 2 significant figures.

2.1 Supplying the cell

Question 12

Markscheme

2.1 Supplying the cell

Question 12

Markscheme

2.1 Supplying the cell

Question 12

2.1 Supplying the cell Questions

2.1 Supplying the cell

Question 12

2.1 Supplying the cell Questions