Quelpr
6 marksCellular Respiration and ATP Synthesis

CAPE Biology Unit 2 · 2008 (Rest of Region) · Paper 2 · Question 1(a)

An experiment investigating oxygen uptake in small organisms using a respirometer apparatus (Figure 1).

Explain how the respirometer apparatus is used to measure the rate of oxygen uptake by organisms.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 1(b)(i)Suggest a control for this experiment.[1 mark]
  2. 1(b)(ii)Plot the results for the germinating peas at 25 °C on the graph grid provided.[4 marks]
  3. 1(b)(iii)Calculate the rate of oxygen consumption for germinating peas at BOTH temperatures (10 °C and 25 °C) using the time interval between 10 and 20 minutes.[2 marks]
  4. 1(b)(iv)a)Comment on the differences in oxygen consumption observed between germinating peas at 10 °C and 25 °C.[1 mark]
  5. 1(b)(iv)b)Comment on the differences in oxygen consumption observed between germinating and dry peas.[1 mark]

More practice: the rest of this paper · more Cellular Respiration and ATP Synthesis questions · all CAPE Biology Unit 2 past papers