生物 2008 年 DSE、CE 選擇題（第 4 頁）

31.

Questions 32 and 33 refer to the following set-up used to study the anaerobic respiration of yeast.

Flask with yeast and boiled glucose solution, paraffin oil and glass tube

To provide an anaerobic condition, which of the following steps are necessary?

(1)add paraffin oil

(2)stopper the flask

(3)boil the glucose solution

32.

In respiration, chemical energy in the substrate is converted to heat energy, chemical energy in ATP and chemical energy in by-products. Which of the following correctly compares aerobic and anaerobic respiration?

(1)Aerobic respiration converts more energy to heat energy.

(2)Aerobic respiration converts more energy to chemical energy in ATP.

(3)Aerobic respiration converts more energy to chemical energy in by-products.

33.

Questions 35 and 36 refer to the graph below, which shows the results of an investigation of an enzyme reaction performed by a group of students:

Graph of time for completion of reaction against temperature

Which of the following is the correct explanation for the above results?

34.

Questions 35 and 36 refer to the graph below, which shows the results of an investigation of an enzyme reaction performed by a group of students:

After the investigation, one of the students concluded that the optimum temperature of this enzyme is 40°C. However, another student disagreed with this conclusion. We can verify whether the conclusion is correct by repeating the experiment

35.

Questions 37 to 39 refer to the diagram below, which shows a simplified food web of a fresh water habitat:

Food web of pike, perch, minnow, water beetle, tadpole and waterweed

Which of the following organisms is a tertiary consumer?

36.

Questions 37 to 39 refer to the diagram below, which shows a simplified food web of a fresh water habitat:

By referring to the relationship between tadpole and minnow, which of the following best indicates the effect of this relationship on each of them? Key: + shows that the organism benefits from the relationship – shows that the organism suffers a loss in the relationship

	Tadpole	Minnow
	+	+
	+	–
	–	+
	–	–

37.

Questions 37 to 39 refer to the diagram below, which shows a simplified food web of a fresh water habitat:

If the fresh water habitat is polluted by DDT (an insecticide) from nearby farmland, the pike will have the highest concentration of DDT in its body. Which of the following is related to this phenomenon?

38.

Questions 40 and 41 refer to the diagram below, which shows an investigation carried out under daylight condition using a leaf freshly removed from a terrestrial plant:

The initial mass of the set-up and its mass after one hour were measured. The results are shown in the table below:

Treatment	Surface illuminated by spotlight	Initial mass (g)	Mass after 1 hour (g)
I	Lower epidermis	378.0	375.4
II	Upper epidermis	375.2	374.6

The change in the mass of the set-up during the experiment was mainly caused by

39.

Questions 40 and 41 refer to the diagram below, which shows an investigation carried out under daylight condition using a leaf freshly removed from a terrestrial plant:

The initial mass of the set-up and its mass after one hour were measured. The results are shown in the table below:

Treatment	Surface illuminated by spotlight	Initial mass (g)	Mass after 1 hour (g)
I	Lower epidermis	378.0	375.4
II	Upper epidermis	375.2	374.6

Which of the following account for the results of the experiment?

(1)The lower epidermis has more stomata than the upper epidermis.

(2)The photosynthetic rate in treatment I is slower than that in treatment II.

(3)The temperature of the lower epidermis in treatment I is higher than that in treatment II.

40.

Natural selection acts upon