生物 2004 年 DSE、CE 選擇題（第 3 頁）

21.

Questions 20 to 22 refer to the diagram below, which shows part of the human digestive system:

Which structures are responsible for the regulation of blood glucose level ?

22.

Questions 20 to 22 refer to the diagram below, which shows part of the human digestive system:

In a healthy person, structure 3 normally contains a large number of bacteria. What is the ecological relationship between the human and the bacteria ?

23.

Questions 23 and 24 refer to the diagram below, which shows three different cell types found in the adult human body:

All three cell types

24.

Questions 23 and 24 refer to the diagram below, which shows three different cell types found in the adult human body:

Structure X of cell type 3 is present abundantly in

25.

Which of the following farming practices would lead to a rapid growth of algae in nearby ponds ?

26.

Questions 26 and 27 refer to the diagram below, which shows the muscles associated with the leg of a person:

When X contracts, Y will

(1)become shorter.

(2)become thicker.

(3)increase in tension.

27.

Questions 26 and 27 refer to the diagram below, which shows the muscles associated with the leg of a person:

Which of the following correctly represents the lever system involved in the straightening of the leg at the knee joint ? (Key: E = effort; L = load)

28.

Questions 28 and 29 refer to the diagram below, which shows the vertical section of a human tooth:

Which structures are hard and rigid ?

29.

Questions 28 and 29 refer to the diagram below, which shows the vertical section of a human tooth:

Which structures receive a continuous supply of nutrients ?

30.

Which of the following is a correct statement about meiosis occurring in the human testis ?