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Sanjay investigates the amount of oxygen made by pondweed. (a) He counts how many bubbles of oxygen are given off by pondweed at different distances from a lamp.

oxygen bubbles

pondweed ruler lamp The table shows his results. Distance between lamp and pondweed in cm

Number of bubbles given off by pondweed in 1 minute

10

48

20

25

30

12

40

7

50

5

(i)

Describe and explain these results. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [3]

Š OCR 2013

B4 question 2 (1)  
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