AnswersCO-Biology B-CRUnit Test

The Digestive and Excretory Systems Answers

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1
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Which statement best describes the breakdown of food in the digestive system?

A
Carbohydrate digestion starts in the stomach and protein digestion starts in the stomach.
B
Carbohydrate digestion starts in the mouth and protein digestion starts in the stomach.
C
Carbohydrate digestion starts in the esophagus and protein digestion starts in the small intestine.
D
Carbohydrate digestion starts in the small intestine and protein digestion starts in the esophagus.
2
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Which shows the best connection between the digestive and excretory systems?

A
The digestive system fuels the cells and the excretory system rids the body of the cells’ waste.
B
The digestive system rids the body of the cells’ waste and the excretory system fuels the cells.
C
The digestive system does physical digestion while the excretory system carries out chemical digestion.
D
The digestive system carries out chemical digestion while the excretory system does physical digestion.
3

Which is the proper order of structures that contact the substances removed from the blood?

A
nephron → urethra → bladder → ureter
B
urethra → ureter → bladder → nephron
C
nephron → ureter → bladder → urethra
D
urethra → bladder → ureter → nephron
4

In which part of the digestive system does a chemical change of the food first occur?

A
mouth
B
esophagus
C
stomach
D
liver
5

The picture represents the excretory system.

Question illustration
A
nephron
B
ureter
C
bladder
D
urethra
6

Which is the role of the gall bladder?

A
to provide physical digestion
B
to store the liquid produced by the liver
C
to make the liquid that is stored in the liver
D
to decrease the chemical digestion
7

Which structures of the digestive system, aside from the small intestine, release substances that help break down food in the small intestine?

A
stomach and liver
B
liver and large intestine
C
pancreas and liver
D
large intestine and pancreas
9

Which plays both a role in physical and chemical digestion?

A
teeth
B
saliva
C
gall bladder
D
villi
10

The diagram shows a nephron.

Question illustration
A
W
B
X
C
Y
D
Z

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