Chapter 7 test

The process of nutrition does not include the

• intake of food.

• use of food molecules for metabolism.

• removal of metabolic wastes.

• breakdown of food substances into simple molecules.

Which of the following structure does not produce digestive juice?

• Pancreas

• Small intestine

• Gall bladder

• Stomach

The dental formula of an animal is i ²/₂, c ¹/₁, pm ²/₂, p ²/₂ . How many teeth does this animal have?

• 7

• 14

• 28

• 32

Which of the following statements about physical digestion and chemical digestion is correct?

• Bile involves in both physical and chemical digestion.

• In the mouth cavity, carbohydrates undergo physical digestion only.

• In both types of digestion, food substances are broken down into simpler molecules.

• Physical digestion can enhance the efficiency of chemical digestion.

The graph shows the percentage of undigested molecules (P, Q and R) present along the alimentary canal.

Which of the following statements correctly interprets the graph?

• No digestion occurs in the mouth cavity.

• The rate of digestion is the fastest in the stomach.

• The digestion of R is completed in the small intestine.

• All molecules are absorbed in colon.

The graph shows the percentage of undigested molecules (P, Q and R) present along the alimentary canal.

Which of the following correctly identifies the three food substances?

• P: starch Q: protein R: lipid

• P: protein Q: lipid R: starch

• P: lipid Q: starch R: protein

• P: starch Q: lipid R: protein

Most water is absorbed in the small intestine. Based on the graph, this is because

• the small intestine has many villi to increase the surface area for water absorption.

• most of the food substances are absorbed in the small intestine, the water potential of blood in the small intestine decreases.

• the alkaline intestinal juice favours the absorption of water in the small intestine.

• the rate of digestion is the highest in the small intestine.

The diagram shows a part of the alimentary canal. Blood vessel X connects the small intestine and the liver.

Which of the following descriptions about blood vessel X is correct?

• It carries oxygenated blood to the liver.

• The water potential of the blood inside blood vessel X is low.

• It is an artery because the blood inside flows towards an organ.

• It transports vitamin A to the liver.

Lipids absorbed in the small intestine are first transported to the

• liver.

• gall bladder.

• large intestine.

• heart.

Which of the following is not an excretory waste produced by the liver?

• carbon dioxide

• urea

• bile pigment

• bile salt