BIOLOGY FORM 4 CHAPTER 9

Which of the following correctly describes the purpose of digestion?

• To break down complex food molecules into simple soluble molecules

• To make complex food molecules from simple soluble molecules

• To make use of simple soluble food molecules

• To remove complex food molecules from the body

Large food molecules need to be broken down to be small enough to pass through cell membranes.

• True

• False

Which statement is NOT true about proteins?

• Protein digestion begins in the mouth.

• Proteins are used for cell growth and repair.

• Proteins are broken down to form amino acids.

• Some complex proteins function as enzymes in the body.

Where is the digestion of food completed?

• liver

• large intestine

• stomach

• small intestine

Why is the oesophagus muscular?

• To break the food into even smaller pieces

• To produce enzymes to digest food

• To push food from the mouth into the stomach

• To move the food back and forth in two directions

Where does carbohydrate digestion begins?

• liver

• mouth

• oesophagus

• stomach

Where does protein digestion begins?

• large intestine

• mouth

• small intestine

• stomach

Where does fat digestion begins?

• colon

• liver

• small intestine

• stomach

Which of the following kills bacteria in the human alimentary canal?

• gastric juice

• mucus

• pancreatic juice

• saliva

This is an image of the

• stomach
• small intestine
• esophagus
• large intestine