NUTRITION AND THE HUMAN DIGESTIVE SYSTEM

Table 1 shows food classes P and Q in different types of meat.

What represent food classes P and Q?

• P : Lipid Q : Carbohydrate

• P : Protein Q : Lipid

• P : Lipid Q : Protein

• P : Carbohydrate Q :Protein

Table 1 shows the results obtained in an experiment to determine the energy value in a groundnut.

Calculate the energy value in the groundnut.

• 2.426 kJ/g

• 4.95 kJ/g

• 2426 kJ/g

• 4950 kJ/g

Diagram 8 shows a physical process in digestion of lipids which is aided by substances X.

What is X and its importance?

• X : Bile salt, Importance : Creates acidic medium

• X : Bile salt, Importance : Reduces surface tension

• X : Hydrochloric acid, Importance : Creates acidic medium

• X : Hydrochloric acid Importance : Reduces surface tension

The following information shows a biochemical reaction.

What is Q?

• Rennin

• Pepsin

• Trypsin

• Erepsin

Diagram 12 shows a human digestive system.

What is the effect towards the individuals if a part of K is removed because of a disease?

• More bile is secreted

• Less pepsin is secreted

• Less lipid is digested

• More protein is digested

Diagram 13 shows the stages of food digestion along the human alimentary canal.

What are O and Q?

• P : Protein Q : Starch

• P : Fat Q : Protein

• P : Starch Q : Fat

• P : Starch Q : Protein

Diagram 11 shows a part of human digestive system.

Which of the following structures A, B, C or D produces bile?

• A

• B

• C

• D

Incomplete digestion of food could happen in humans if

• the body temperature is 40 $\degree$  C

• the concentration of digestive enzyme is high

• Thyroxine hormones are increased

• pH level is very low in the stomach

Diagram 10 shows cross section of the ileum.

Which part labelled A, B, C or D contributes to effectiveness of nutrients absorption?

• A

• B

• C

• D

Diagram 11 shows one of the internal organ, X in human body.

Which activities will be affected if organ X is damaged?

• Excess glucose cannot be converted into glycogen

• More toxin will be removed

• Deamination does not occur

• Insulin cannot be produced