生物 2008 年 DSE、CE 選擇題（第 6 頁）

51.

Which of the following graphs correctly shows the changes in the dry mass of the plumule (P) and the radicle (R) of a germinating seed?

Graphs A to D of dry mass against time for P and R

52.

Questions 54 and 55 refer to the diagram below, which shows an investigation about the growth response of four seedlings to unilateral light:

Four seedlings at the beginning and after two days of unilateral light

A student concluded that the tip of the seedling is responsible for detecting the direction of the unilateral light. His conclusion was based on the comparison of the growth of seedlings

53.

Questions 54 and 55 refer to the diagram below, which shows an investigation about the growth response of four seedlings to unilateral light:

What other conclusion can be drawn from the above results?

54.

Questions 56 and 57 refer to the diagram below, which shows the cross section of a mango:

Cross section of a mango with parts P, Q and R

Which part(s) contain(s) stored food for germination?

55.

Questions 56 and 57 refer to the diagram below, which shows the cross section of a mango:

Which parts have the same genotype in their cells?

56.

The photomicrograph below shows the cross section of a stem.

Photomicrograph of a stem cross section with regions X, Y and Z

Which regions can provide support to the plant?

57.

Questions 59 and 60 refer to the diagram below, which shows certain metabolic pathways that take place in a mesophyll cell:

Which of the following processes requires light energy?

58.

Questions 59 and 60 refer to the diagram below, which shows certain metabolic pathways that take place in a mesophyll cell:

Which of the following statements concerning Y is correct?