Why are benthic macroinvertebrates useful indicators of water quality?
their life cycles are relatively long for insects
they are relatively stationary (they don’t move long distances)
they can indicate long term or chronic levels of pollution
all of the above
QUESTION 2
Which phrase best describes the legs of the following organism?
pteronarcyidae.jpg
6 unsegmented legs
6 segmented legs
more than 6 unsegmented legs
more than 6 segmented legs
QUESTION 3
The following organism does not have a distinct head.
ryacoph.jpg
True
False
QUESTION 4
Your group has just collected and identified the following organisms:
22 crane fly larvae, 15 midges, 4 dragonfly nymphs, 10 sowbug, 11 aquatic worms, 33 caddisfly larvae, 4 waterpennies, and 1 left handed snails.
How many taxa does this represent?
1
4
8
100
QUESTION 5
Your group has just collected and identified the following organisms:
22 crane fly larvae, 15 midges, 4 dragonfly nymphs, 10 sowbug, 11 aquatic worms, 33 caddisfly larvae, 4 waterpennies, and 1 left handed snails.
What is the pollution tolerance index value?
1.0 = excellent water quality
2.1= good water quality
2.4 = good water quality
2.5 = good water quality
