Need for transport: Digestive system homework

1. The function of the villi is to increase the surface area for

A absorptionB protectionC acid productionD peristalsis

2. Which line in the table below describes correctly the changes in food due to digestion?

3. Digestion takes place in animals

A and allows insoluble molecules to pass directly through the wall of the small intestine.

B as enzymes cannot act on insoluble moleculesC and makes insoluble molecules soluble to allow

absorptionD and allows food to be passed along the gut by

peristalsis

Changes in foodMolecule

sizeSolubility

A decreases increasesB decreases decreasesC increases decreasesD increases increases

Need for transport: Digestive system homework

4. The diagram below shows some structures in a villus.

Which line in the table below correctly identifies the products of digestion which pass into structures X and Y?

X YA glucose amino

acidsB glycerol fatty acidsC amino acids glycogenD fatty acids glucose

Need for transport: Digestive system homework

5. The diagram shows the apparatus used to investigate the energy of fat.

18. Which of the experiments shown below allows a valid comparison to be made between the energy content of fat and protein?

Need for transport: Digestive system homework

6. When the body is starved of food it has to rely on its food reserves to provide energy.

The first food reserves to be used are carbohydrates, then fats; after several weeks of starvation, proteins are used.

Which of the graphs below shows what would happen to the food reserves if an individual was starved for several weeks?

A

B

D

C

Need for transport: Digestive system homework

7. The diagram below shows the human alimentary canal.

(a) Copy the table below and name the labelled parts.

Letter NameBCD

(b) Excess glucose in the diet is converted into an insoluble compound which is stores in the liver. Name this compound.

Need for transport: Digestive system homework

8. The table below shows the composition of four foods.

(a) The final column in the table has been headed ‘other’.

Name one of the food groups which is included under this heading.

(b) Which component of food is needed to produce enzymes?

Food Components

Food Carbohydrate%

Fat%

Protein%

Water%

Other%

meat 0 18 18 62 2milk 5 5 4 86 0maize 10 2 7 78 3soya beans 34 18 34 9 5