bio past paper

Topics: Plant, Cell, Eukaryote Pages: 194 (23002 words) Published: October 13, 2013
CONTENTS
HKCEE
Biology
Long Questions

SECTION 1 THE CELL
1

The cell and its activities

P1-11

SECTION 2 ORGANISMS AND THEIR ENVIRONMENT
2.1 Diversity of organisms

P12-16

2.2 Ecosystem

P17-23

2.3 Human impacts on the environment

P24-33

SECTION 3 ENERGETICS
3.1 Photosynthesis

P34-40

3.2 Respiration

P41-46

SECTION 4 OBTAINING ESSENTIALS FOR LIFE
4.1 Nutrition and gas exchange in plants

P47-51

4.2 Water relation and transport in plants

P52-64

4.3 Food and humans

P65-71

4.4 Nutrition in humans

P72-79

4.5 Gas exchange in humans

P80-86

4.6 Transport in humans

P87-99

SECTION 5 COORDINATION AND RESPONSE
5.1 Detecting environmental conditions

P100-104

5.2 Nervous coordination in humans

P105-110

5.3 Locomotion in humans

P111-113

5.4 Growth responses of plants

P114-116

SECTION 6 REGULATION AND DEFENCE
6.1 Osmoregulation and excretion

P117-122

6.2 Regulation of body temperature

P123-125

6.3 Regulation of glucose level in blood

P126-130

6.4 Defence against diseases

P131-133

SECTION 7 REPRODUCTION AND GROWTH
7.1 Types of cell division

P134

7.2 Sexual reproduction in flowering plants

P135-140

7.3 Sexual reproduction in humans

P141-150

7.4 Growth and development

P151-154

SECTION 8 GENETICS AND EVOLUTION
8.1 Genes and inheritance

P155-156

8.2 The pattern of inheritance

P157-166

8.3 Variations

P167-169

8.4 Genetic engineering

P170

HKCEE BIOLOGY | 1 The cell and its activities

|

P.1

1. 1990/I/1a
The diagram below shows four types of cells :

(i)
(ii)

Which of the above are plant cells ? State TWO plant cell features that are common to the cells you have listed.
(3 marks)
For each of the cells A and B

(iii)

(1) suggest ONE function, and
(2) state ONE structural feature, as shown in the diagram, which is essential for this function. (4 marks)
Describe the changes in cells C and D after they have been placed in distilled water for thirty minutes. Explain your answer.

(6 marks)

2. 1990/I/2a
In an experiment to study the effect of pH on enzyme activity, five test-tubes containing equal volumes of an enzyme solution each at a different pH were prepared. A 1 cm3 cube of coagulated (clotted) egg white was then added to each tube. The tubes were allowed to stand at a room temperature of 25 oC. The time taken for the disappearance of the cube in each tube was recorded as follows : pH of the enzyme solution

Time take for the disappearance of the egg white
cube (min)

1
2
3
4
5
(i)
(ii)

13
9
11
45
The cube still remained after 60 minutes

How is the time for the disappearance of the egg white cube related to the rate of enzyme activity ? (1 mark)
At which pH was the enzyme most active ?
(1 mark)

1

HKCEE BIOLOGY | 1 The cell and its activities

(iii)
(iv)
(v)
(vi)

|

P.2

Suggest TWO ways to enable this experiment to be completed in a shorter period of time. (2 marks)
Besides noting the time for the disappearance of the egg white cubes, suggest ANOTHER way to measure the rate of enzyme activity in this experiment.
(2 marks)
Name a region of the human alimentary canal which secrets such an enzyme. (1 mark)
What control experiment should be carried out to confirm that the disappearance of the egg white cubes is due to enzyme action ?
(2 marks)

3. 1991/I/1a
Photomicrograph 1 show some cells of a human blood smear.
Photomicrograph 2 shows some cells of an onion epidermis.

(i)
(ii)

With reference to the photomicrographs only, state TWO structural differences between cell A and cell C.
(2 marks)
(1) The central part of cell B looks lighter in colour. Explain this with reference to its shape. (2 marks)
(2) How is the shape related to its function ?
(2 marks)

(iii)
(iv)

Cell A is found in large numbers in wounds. What is the function of cell A there ? (1 mark)
Describe and explain...
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