Question bank2.1 Supplying the cell

2.1 Supplying the cell

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Question 56

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 56

Markscheme

2.1 Supplying the cell

Question 56

Markscheme

2.1 Supplying the cell

Question 56

2.1 Supplying the cell Questions

2.1 Supplying the cell

Question 56

2.1 Supplying the cell Questions