6 2
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