2001
2001-CE
BIO
HONG KONG EXAMINATIONS AUTHORITY
PAPER 1
HONG KONG CERTIFICATE OF EDUCATION EXAMINATION 2001
BIOLOGY PAPER 1
8.30 am – 10.00 am (1½ hours)
This paper must be answered in English
1.
Attempt THREE questions only.
2.
Each question consists of three parts.
3.
All questions carry equal marks.
4.
In each question, 2 additional marks will be awarded for effective communication. 5.
The diagrams in this paper are NOT necessarily drawn to scale.
香 港 考 試 局 保 留 版 權
Hong Kong Examinations Authority
All Rights Reserved 2001
2001-CE-BIO 1–1
1. (a)
The diagram below shows a town and its surrounding areas :
(i)
(ii)
Domestic sewage produced in the town is first treated in the sewage treatment plant. The effluent (treated sewage) is then used to irrigate the fields.
(1)
During sewage treatment, air is bubbled into the sewage continuously. Explain the importance of this step.
(3 marks)
(2)
Suggest two reasons why the practice of using the effluent to irrigate the fields is environmentally friendly.
(2 marks)
If the same crop is grown in the fields year after year, the annual production of the fields will decrease. Suggest two reasons for this.
(2 marks)
(iii) Uncontrolled deforestation occurs in the mountain areas. Explain one way in which this activity may affect the water supply to the town.
(3 marks)
2001-CE-BIO 1–2
–1–
1. (b)
The graphs below show the concentration of three substances in the renal artery, and the changes in their concentration along the nephron and the collecting duct : blood plasma in fluid in nephron renal artery
fluid in collecting duct
Percentage of protein Percentage of urea Percentage of substance X
(i)
Explain the difference in the concentration of protein between the blood plasma and the fluid in the nephron.
(2 marks)
(ii)
What process causes the increase in urea concentration along the collecting duct ?
(1 mark)
(iii) (1)
What may substance X be ?
(1 mark)
(2) Explain the change in the
BIO
HONG KONG EXAMINATIONS AUTHORITY
PAPER 1
HONG KONG CERTIFICATE OF EDUCATION EXAMINATION 2001
BIOLOGY PAPER 1
8.30 am – 10.00 am (1½ hours)
This paper must be answered in English
1.
Attempt THREE questions only.
2.
Each question consists of three parts.
3.
All questions carry equal marks.
4.
In each question, 2 additional marks will be awarded for effective communication. 5.
The diagrams in this paper are NOT necessarily drawn to scale.
香 港 考 試 局 保 留 版 權
Hong Kong Examinations Authority
All Rights Reserved 2001
2001-CE-BIO 1–1
1. (a)
The diagram below shows a town and its surrounding areas :
(i)
(ii)
Domestic sewage produced in the town is first treated in the sewage treatment plant. The effluent (treated sewage) is then used to irrigate the fields.
(1)
During sewage treatment, air is bubbled into the sewage continuously. Explain the importance of this step.
(3 marks)
(2)
Suggest two reasons why the practice of using the effluent to irrigate the fields is environmentally friendly.
(2 marks)
If the same crop is grown in the fields year after year, the annual production of the fields will decrease. Suggest two reasons for this.
(2 marks)
(iii) Uncontrolled deforestation occurs in the mountain areas. Explain one way in which this activity may affect the water supply to the town.
(3 marks)
2001-CE-BIO 1–2
–1–
1. (b)
The graphs below show the concentration of three substances in the renal artery, and the changes in their concentration along the nephron and the collecting duct : blood plasma in fluid in nephron renal artery
fluid in collecting duct
Percentage of protein Percentage of urea Percentage of substance X
(i)
Explain the difference in the concentration of protein between the blood plasma and the fluid in the nephron.
(2 marks)
(ii)
What process causes the increase in urea concentration along the collecting duct ?
(1 mark)
(iii) (1)
What may substance X be ?
(1 mark)
(2) Explain the change in the