2.1 Supplying the cell

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Question 2

A student uses a respirometer to investigate the rate of aerobic respiration in germinating mung beans at a constant temperature.

The student recorded the following distances moved by the colored liquid drop in one minute when the experiment was conducted in a water bath at $25∘C25^\circ\text{C}$ :

Trial 1: $mm72\text{ mm}$
Trial 2: $mm78\text{ mm}$
Trial 3: $mm75\text{ mm}$

Explain why the student represented this set of results as $75 \pm 3\text{ mm}$ .

[2]

At this temperature, the mean distance the liquid drop moved in one minute was $mm75\text{ mm}$ . The diameter of the narrow capillary tube in the respirometer is $mm0.8\text{ mm}$ .

Calculate the volume of oxygen taken up by the germinating mung beans 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 drop moves, and $π=3.14\pi = 3.14$ .

Give your answer to 2 significant figures.

[3]

A student uses a respirometer to investigate the rate of aerobic respiration in germinating mung beans at a constant temperature.

The student recorded the following distances moved by the colored liquid drop in one minute when the experiment was conducted in a water bath at $25∘C25^\circ\text{C}$ :

Trial 1: $mm72\text{ mm}$
Trial 2: $mm78\text{ mm}$
Trial 3: $mm75\text{ mm}$

Explain why the student represented this set of results as $75 \pm 3\text{ mm}$ .

[2]

At this temperature, the mean distance the liquid drop moved in one minute was $mm75\text{ mm}$ . The diameter of the narrow capillary tube in the respirometer is $mm0.8\text{ mm}$ .

Calculate the volume of oxygen taken up by the germinating mung beans 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 drop moves, and $π=3.14\pi = 3.14$ .

Give your answer to 2 significant figures.

2.1 Supplying the cell

Question 2

Markscheme

2.1 Supplying the cell

Question 2

Markscheme

2.1 Supplying the cell

Question 2

2.1 Supplying the cell Questions

2.1 Supplying the cell

Question 2

2.1 Supplying the cell Questions