生物 2007 年 DSE、CE 選擇題（第 2 頁）

11.

Questions 10 and 11 refer to the photomicrographs below, which show a stained human blood smear under different magnifications:

The characteristic appearance of cell type Y is due to

(1)its thicker periphery.

(2)its large central vacuole.

(3)the absence of a nucleus.

12.

Which of the following correctly describes the functioning of the human breathing system?

13.

Cigarette smoking results in the deposition of tar on the inner surface of the air sacs. This would decrease

14.

One day, Adam, Brenda, Calvin and Doris were watching a football match of the World Cup. The following are their dialogues about the heartbeat rate of the football players.

(1)Adam: “Hey! The football players need more energy than us at rest, so their heartbeat rate is higher.”

(2)Brenda: “No, they are well-trained. They can breathe deeper such that they have a lower heartbeat rate.”

(3)Calvin: “Wrong! They have a stronger heart to pump blood. So, their heartbeat rates should be lower than ours.”

(4)Doris: “I partially agree with Calvin. They have a lower heartbeat rate because their arteriole walls are stronger to pump more blood.”

Whose view is correct?

15.

The diagram below shows part of the urinogenital system of a man:

Which of the following structures contribute to the content of semen?

16.

Which of the following is a female secondary sexual characteristic?

17.

Which of the following cannot help the sperm to get into the uterus during sexual intercourse?

18.

Which of the following substances will diffuse from maternal blood to foetal blood through the placenta?

19.

Questions 19 and 20 refer to the diagram below, which shows the human alimentary canal and its associated structures:

Which of the following structures are responsible for producing secretions that help the digestion of proteins?

20.

Questions 19 and 20 refer to the diagram below, which shows the human alimentary canal and its associated structures:

Which of the following would be the possible effect of removing part of structure 4 in an operation?