Senior Secondary (HKDSE) · Biology

Essential life processes in animals: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Essential life processes in animals.

10 questions25 marksFree, no account

Question 1

1 mark

In human blood, which component is responsible for transporting the majority of carbon dioxide in the form of hydrogencarbonate ions?

Question 2

1 mark

During forced expiration, such as during vigorous exercise, which of the following sets of muscles contract to reduce the volume of the thoracic cavity?

Question 3

1 mark

Following the absorption of a meal rich in various nutrients, the hepatic portal vein delivers substances to the liver. Which statement accurately describes a function of the liver immediately after a mixed meal?

Question 4

1 mark

In the human digestive system, which part of the alimentary canal is the primary site for the absorption of nutrients into the blood?

Question 5

1 mark

Which of the following statements correctly compares the blood in the hepatic portal vein with the blood in the hepatic vein approximately two hours after a meal high in proteins?

Question 6

2 marks

Explain why lymph contains a significantly higher concentration of lipids than blood plasma shortly after a meal rich in fats.

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Question 7

4 marks

When a person consumes a large amount of salty food, it leads to an increase in the plasma osmotic pressure. Explain the role of the pituitary gland and the subsequent change in the nephron that helps the body restore its water balance.

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Question 8

5 marks

Explain the physiological significance of the time delay in impulse conduction at the atrioventricular (AV) node during the human cardiac cycle, with reference to the coordination of heart chambers.

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Question 9

3 marks

The process of nutrition begins with ingestion and mechanical digestion in the mouth.

(a) Name the specific type of teeth that are primarily adapted for grinding and crushing food into smaller pieces.
(b) Explain how the process of mastication (chewing) aids the subsequent chemical digestion of food by enzymes.

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Question 10

6 marks

Describe the roles of the mouth and small intestine in the digestion of carbohydrates in humans.

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