生物 1995 年 DSE、CE 選擇題（第 3 頁）

21.

Questions 20 and 21 refer to the diagram below which shows a set-up for measuring water loss from a plant. The mass of the U-tube and its content was recorded at different times of the experiment :

Treatment	Time of measurement	Mass of the U-tube and its content (g)
1. Without plant in bell jar	At the beginning	100
	After one hour	105
2. With plant in bell jar	At the beginning	100
	After one hour	120

Which of the following changes would increase the rate of water loss from the plant inside the bell jar ?

22.

Normally, blood does not contain

23.

All veins carry

24.

The photomicrograph below shows a human blood smear :

Which of the following are the functions of structures 1, 2 and 3 ?

Structure 1	Structure 2	Structure 3
transports oxygen	transports glucose	transports carbon dioxide
transports oxygen	for blood clotting	engulfs bacteria
transports carbon dioxide	transports glucose	engulfs bacteria
transports carbon dioxide	for blood clotting	transports oxygen

25.

Questions 25 and 26 refer to the diagram below which shows a section of the mammalian heart :

With reference to the diagram, which heart chambers are contracting ?

26.

Questions 25 and 26 refer to the diagram below which shows a section of the mammalian heart :

Which blood vessels are connected to the lungs ?

27.

Heart attacks are caused by

28.

Questions 28 to 30 refer to the diagram below which shows a section of a certain part of a plant :

This section is taken from

29.

Questions 28 to 30 refer to the diagram below which shows a section of a certain part of a plant :

Which regions provide support by cell turgidity ?

30.

Questions 28 to 30 refer to the diagram below which shows a section of a certain part of a plant :

Which region is responsible for the transport of sugars ?