Edexcel Gcse Biology/additional Science - Unit B2: The Components Of Life Page 15
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3315
PROBIOTIC BACTERIA
3
The digestive system is made up of a number of
different organs.
(a) Define the term ORGAN. (1 mark)
_________________________________________________________
_________________________________________________________
_________________________________________________________
(b) (i)
How many of the statements are correct?
●
The low pH of the stomach kills bacteria.
●
The low pH of the stomach provides
optimum conditions for pepsin activity.
●
The pH of the stomach is low so that acid
digests protein.
Put a cross (
) in the box next to your answer.
(1 mark)
A
none
B
1
C
2
D
3
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