SB9e Assessing polution

Question 1

What is an Indicator species?

Answer 1

An indicator species is a species that is particularly sensitive or tolerant of
pollution, so that its presence or absence can be used as a measure of
pollution

Question 2

What are some examples of an indicator species

Answer 2

Examples of indicator species:
 Lichen
 Blackspot fungus
 Aquatic species

Question 2

Explain Blackspot fungus as an indicator species

Answer 2

 If blackspot fungus is present =
less sulphur in atmosphere

 If blackspot fungus is absent =
high levels of sulphur in
atmosphere

Question 3

Explain lichen as an indicator species

Answer 3

Presence of lichen = low pollution / low Sulphur dioxide levels
Absence of lichen = high pollution / high Sulphur dioxide levels
Flat lichen present = high pollution / high Sulphur dioxide levels
Leafy lichen present = low pollution / low Sulphur dioxide levels

Question 4

Name the aquatic species that show the water pollution levels are low.

Answer 4

Stonefly nymph
dragonfly nymph

Question 5

Name the aquatic species that show the water pollution levels are High.

Answer 5

bloodworm
sludge worm
no life