YEAR 12 BIOLOGY SECOND TERM EXAM

What is the main function of the digestive system in vertebrates?

• To absorb nutrients from food

• To synthesize proteins and carbohydrates

• To eliminate waste products from the body

• To regulate body temperature.

Which of the following is the first step in the digestion of food in vertebrates?

• Mechanical breakdown of food in the mouth

• Chemical digestion of carbohydrates in the stomach

• Absorption of nutrients in the small intestine

• Elimination of waste products from the body.

What is the role of saliva in the digestive process?

• To break down proteins into amino acids

• To emulsify fats and make them easier to digest

• To moisten and lubricate food for swallowing

• To absorb nutrients from food.

Which of the following enzymes is responsible for breaking down proteins in the stomach?

• Pepsin

• Trypsin

• Amylase

• Lipase.

What is the role of the pancreas in the digestive process?

• To produce bile to emulsify fats

• To produce digestive enzymes to break down carbohydrates, proteins, and fats

• To absorb nutrients from food

• To eliminate waste products from the body.

Which of the following is the main site of nutrient absorption in the digestive system?

• Mouth

• Stomach

• Small intestine

• Large intestine.

What is the role of the liver in the digestive process?

• To produce bile to emulsify fats

• To produce digestive enzymes to break down carbohydrates, proteins, and fats

• To filter toxins from the blood

• To store glycogen and regulate blood sugar levels.

Which of the following is the main function of the large intestine?

• To absorb nutrients from food

• To eliminate waste products and reabsorption of water.

• To synthesize vitamins and hormones

• To regulate body temperature.

What is the role of the appendix in the digestive system?

• To absorb nutrients from food

• To eliminate waste products from the body

• To synthesize vitamins and hormones

• To aid in the digestion of cellulose.

Which of the following is a characteristic of the digestive system in vertebrates?

• It is a closed system, meaning that food is not eliminated from the body

• It is an open system, meaning that food is eliminated from the body

• It is a self-sustaining system, meaning that it can produce its own nutrients

• It is a dependent system, meaning that it relies on other systems to function.