No questions found
(a) (i) Prepare the space below and record your results.
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(a) (ii) Identify two significant sources of error in your investigation.
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(a) (iii) Suggest how you would make three improvements to this investigation.
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(b) (i) Three of the values in Table 1.1 are anomalous. Draw a circle around each of these values.
[1]
(b) (ii) Complete Table 1.1 by calculating the missing value.
[1]
(b) (iii) Plot a graph of the data shown in Table 1.1.
[4]
(b) (iv) Explain the relationship between pH and the enzyme catalase shown in the data.
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574
568
595
J1 is a slide of a stained transverse section showing part of a lung of a mammal.
(a) Make a large, high-power drawing to show details of five of the structures specialised for gas exchange (alveoli). The walls of one alveolus must be touching the walls of at least two other alveoli.
Label where gas exchange takes place.
Fig. 2.1 is a photomicrograph of a transverse section through a lung from a mammal.
The outer layer of the bronchiole and the wall of the blood vessel are labelled.
(b) (i) Draw a large plan diagram of the bronchiole shown in Fig. 2.1.
Label the lumen.
(ii) Calculate the ratio of the mean thickness of the outer layer of the bronchiole compared to the mean thickness of the wall of the blood vessel shown in Fig. 2.1.
Show clearly on Fig. 2.1 where you measured the thicknesses.
You may lose marks if you do not show your working or if you do not use the appropriate units.
(iii) Prepare the space below so that it is suitable for you to compare the observable features of the bronchiole and blood vessel in the photomicrograph Fig. 2.1.
576
510
565
