An investigation was carried out to show the effect of increasing light intensity on the rate of photosynthesis. - The rate was measured by recording the amount of carbon dioxide that was absorbed or released. - Other factors were kept constant. Table 1.1 shows the results that were obtained. Table 1.1 light intensity / arbitrary units carbon dioxide intake / arbitrary units --- --- 0 $-0.5$ 2 1.0 4 2.5 6 4.0 8 4.5 12 4.8 16 4.7 (i) Construct a graph on the grid below, from…

Biology 5090/61 — October/November 2010

Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme

questions

marks

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Topics Experimental Contexts · Analysis, Conclusions and Evaluation · Microscopy and Biological Drawing · Planning Experiments and Investigations

Q112MExperimental ContextsAnalysis, Conclusions and EvaluationFree sample

An investigation was carried out to show the effect of increasing light intensity on the rate of photosynthesis.

The rate was measured by recording the amount of carbon dioxide that was absorbed or released.
Other factors were kept constant.

Table 1.1 shows the results that were obtained.

Table 1.1

light intensity / arbitrary units	carbon dioxide intake / arbitrary units
0	$-0.5$
2	1.0
4	2.5
6	4.0
8	4.5
12	4.8
16	4.7

(a)

(i)

Construct a graph on the grid below, from the figures in Table 1.1.

grid

(ii)

Explain how the graph demonstrates the concept of limiting factors.

(iii)

From your graph determine the light intensity when no carbon dioxide is taken in or released.

______

(iv)

Explain why carbon dioxide is neither taken in nor released at this light intensity.

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