ASSIGNMENT (c) Copper(ll) ions (Cu2+) inhibit the function of a proportion of the chlorophyll a present in
single-celled, photosynthetic protoctists.
The concentration of functional chlorophyll a in these organisms was measured in two
different months of the same year in an unpolluted lake and in a lake polluted with
copper ions.
The results are shown in Table 3.1.
Lake
Table 3.1
Concentration of functional chlorophyll al ug dm-
Month A
Month B
3.45
0.24
1.79
0.24
Unpolluted
Polluted with copper ions
Describe and suggest explanations for the results shown in Table 3.1.

Select all the correct answers. which statements fail to meet the requirements of a scientific claim? a). in the final 100 meters of a 10,000-meter race, an athlete's speed is more strongly related to anaerobic efficiency than to aerobic efficiency. b). flowers that reflect the most ultraviolet light are more likely to attract bees and other pollinators than flowers that reflect less ultraviolet light. c). the evidence supporting newton's laws of motion was accurate in newton's time, but the universe operates differently today. d). even though evidence indicates that the solar system's planets follow elliptical paths, copernicus's model involving circular orbits is true.