ASJA BOYS’ COLLEGE CHARLIEVILLE END OF TERM EXAMINATION BIOLOGY TERM III - June 2012 FORM 4 4RM & 4SJ Paper 02 - General proficiency 2 hours 30 minutes NAME: ___________________________________ DATE: __________________________ ________ Page 1 of 20 READ THE FOLLOWING INSTRUCTIONS CAREFULLY 1. This paper consists of SIX questions in two sections. Answer ALL questions. 2. For Section A , write your answers in the spaces provided on this paper. 3. For Section B , write your answers on your examination writing pad. Each question should be written on a NEW page and attached to the back of the question paper and return them to the
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ASJA BOYS’ COLLEGE CHARLIEVILLE
END OF TERM EXAMINATION
BIOLOGY
TERM III - June 2012
FORM 4
4RM & 4SJ
Paper 02 - General proficiency
2 hours 30 minutes
NAME: ___________________________________
DATE: __________________________________
FORM: __________________________________
TEACHER: ___________________________________
For Teacher Use OnlyQuestion Number
MarkSection Total
1
A2
3
4
B5
6
TOTAL
DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO
Page 1 of 11
READ THE FOLLOWING INSTRUCTIONS CAREFULLY
1. This paper consists of SIX questions in two sections. Answer ALL questions.
2. For Section A, write your answers in the spaces provided on this paper.
3. For Section B, write your answers on your examination writing pad. Each question should be written on a NEW page and attached to the back of the question paper and return them to the Supervisor.
4. Where appropriate, answers should be illustrated by diagrams.
5. Scientific calculators are allowed.
SECTION A
Answer ALL questions in this section.
You should NOT spend more than 30 minutes on Question 1
1. A student investigating transpiration carried out the following procedure. He obtained two celery stalks and cut the bottom of each while they were submerged in water. The cut ends of both stalks were then quickly placed into two flasks of dye, Flask A and Flask B. Flask A was placed on a laboratory bench in normal room conditions; while Flask B was put in the same room but warm air from a blow-dryer was directed onto it. The time was noted and the celery stalks were allowed to stand for 30 minutes. The students measured and recorded the distance the dye had travelled up each stalk at five-minute intervals during the 30-minute period. The results are shown in Table 1.
TABLE 1: DISTANCE DYE TRAVELLED UP THE CELERY STALKS
Time (Minutes) Stalk A (Distance in cm) Stalk B (Distance in cm)
5 1 2
10 3 4
15 5 8
20 7 12
25 9 15
30 10 17
(a) (i) On the grid provided on page 3, draw a line graph to represent the data shown in Table 1[4 marks]
(ii) Account for the differences in the shape of the line graphs for Stalks A and B.
(c) Severe lack of Vitamin A result in the cornea of the eye becoming dry and thickened. Explain how this condition would affect a person’s ability to see.
(d) (i) Diagrams C and D in Figure 4 show two common eye defects, while Diagrams 7, 8 and 9 show three types of lenses that can be used to correct eye defects.
Figure 4: Common eye defects and corrective lenses
Identify the eye defects and the lenses in Figure 4 that can be used to correct the defects.
Diagram C Eye defect: ____________________________________________
Write your answers in your answer booklet and attach securely to the question paper.Each question should be done on a NEW page. Use full sentences when answering the
questions.
4. (a) Describe photosynthesis in green plants. [5 marks]
(b) With the aid of a fully annotated diagram, explain how visible external features of
A green dicotyledonous leaf aid the process of photosynthesis. [3 marks]
(c) When leaves fall from plants, microorganisms feed on them.
(i) What is the name given to these microorganisms?
(ii) Explain how this type of nutrition differs from photosynthesis.
[3 marks]
(d) There are advantages and disadvantages when leaves fall from plants.
Suggest TWO advantages and TWO disadvantages to a plant, when leaves fall from it. [4
marks]
Total 15 marks
5. The kidney is an important excretory organ in mammals.
(a) Name TWO substances excreted by the kidney. [2 marks]
(b) With the aid of an annotated diagram, explain how urine is formed in the human
kidney. [9 marks]
(c) An analysis of a sample of urine shows the presence of blood cells and glucose.
Account for the presence of these substances in the urine. [4 marks]
Total 15 marks
Page 10 of 11
6. (a) Using examples distinguish between receptors and effectors [4 marks]
(b) Explain why it is important for an animal to have organs of sensitivity.
[3 marks]
(c) (i) Describe how the skin is equipped to carry out its sensory function.
[2 marks]
(ii) Draw a simple representation of the path impulses would follow if the sense organ referred to in (c) (i) were part of a reflex arc. (Identify a stimulus, receptor, sensory/relay/motor neurones, muscle and response.) [6 marks]
Total 15 marks
END OF EXAMINATION
TOTAL 100 MARKS
Ms. Indira C. and Ms Amy H.Have a wonderful July- August Vacation Boys!!!