The graph below illustrates a single species of bacteria grown at various pH levels. The most likely reason there are no
colonies in cultures of this species at pH 4 and at pH 10 is
that
Number of Colonies of Bacteria
Present at various pH Levels
70
60
50
40
Number of Colonies of

Bacteria Present in Culture
30
20
10
0
4
5
6
7
8
9
10
pH
O these bacteria could successfully compete with other species of
bacteria at these pH values
there are more predators feeding on these bacteria at pH 4 and
pH 10 than at other pH levels
O at pH 4 and pH 10 the environment is too acidic or too basic for
the bacteria to grow
fertilization cannot occur in these bacteria at pH 4 or pH 10

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