生物 1992 年 DSE、CE 選擇題（第 4 頁）

31.

Questions 31 and 32 refer to diagrams I and II below. Diagram I shows a girl maintaining a posture on a balance beam. Diagram II shows some muscles associated with her left leg.

Which of the following muscles in the girl’s left leg are contracting when she keeps such a posture ?

32.

Questions 31 and 32 refer to diagrams I and II below. Diagram I shows a girl maintaining a posture on a balance beam. Diagram II shows some muscles associated with her left leg.

The degree of movement allowed in joints X and Y are :

	Joint X	Joint Y
	in one plane	in one plane
	in one plane	in all planes
	in all planes	in one plane
	in all planes	in all planes

33.

In blood donation, blood is collected from the vein instead of the artery because

34.

Two samples of human blood were mixed. Observation under the microscope showed no clumping of blood cells. Which of the following is the best conclusion ?

35.

Which of the following are advantages of seed dispersal ?

(1)It reduces competition.

(2)It prevents the spread of diseases.

(3)It increases the chances of genetic variations.

36.

Questions 37 and 38 refer to the diagrams below. Diagram I shows a longitudinal section of a flower. Diagram II shows a section of the human female reproductive system.

Where does fertilization normally occur ?

	Diagram I	Diagram II
	3	5
	2	5
	3	7
	2	7

37.

Questions 37 and 38 refer to the diagrams below. Diagram I shows a longitudinal section of a flower. Diagram II shows a section of the human female reproductive system.

Which structure of the flower is comparable to structure 6 in humans ?

38.

If the diploid chromosome number of a flowering plant is 24, which of the following structures has 12 chromosomes ?

39.

One of the functions of the placenta of a mammal is to

40.

The conditions necessary for germination for all kinds of seeds are

(1)light

(2)water

(3)oxygen

(4)a suitable temperature