"] Study the following graph and answer the questions that follow.
Note: Cobalt chloride paper is blue when dry and turns pink when in contact with water
Both plants, A and B, were exposed to the same environmental conditions.
Graph showing time taken for cobalt chloride
paper to turn pink under different conditions
12
plant B
10
8
Time taken for cobalt chloride
paper to turn pink (minutes)
plant A
2
0
upper lower
upper lower
surface
Surface
1.4.1 Give a possible aim for the investigation.
(1)
1.4.2 Which plant, A or B, is likely to have xerophytic properties?
Explain your answer.
(4)
1.4.3 Explain the difference between the results obtained for the upper and the lower
surfaces of plant B.
1.4.4 Explain how the internal temperature of plant A will be influenced if the lower
surfaces of its leaves are covered with Vaseline.
(5)
[12]
PRATICA​