r qto TEST CODE OI2O7O2O -l FORM TP 2017045 MAY/JUNE 2017 CARIBBEAN EXAMINATIONS COUNCIL CARIBBEAN SECONDARY EDUCATION CERTIFICATE@ EXAMINATION BIOLOGY Paper 02 - General Proficiency 2 hours 30 minutes DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO. READ THE FOLLOWING INSTRUCTIONS CAREFULLY. 1. This paper consists of SIX questions in TWO sections. AnswerALL questions. 2. Write your answers in the spaces provided in this booklet. 3. Do NOT write in the margins. 4. Where appropriate, answers should be illustrated with diagrams. If you need to rewrite any answer and there is not enough space to do so on the original page, you must use the extra lined page(s) provided at the back of this booklet. Remember to draw a line through your original answer. If you use the extra page(s), you MUST write the question number clearly in the box provided at the top of the extra page(s) and, where relevant, include the question part beside the answer. 5 6. Copyright @ 2015 Caribbean Examinations Council All rights reserved. I il]il ilil til! tilt ilil lllll llll lill llll llll lil lill 0120702003 J L-'.or,oro2o. 2or7
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DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO.
READ THE FOLLOWING INSTRUCTIONS CAREFULLY.
1. This paper consists of SIX questions in TWO sections. AnswerALL questions.
2. Write your answers in the spaces provided in this booklet.
3. Do NOT write in the margins.
4. Where appropriate, answers should be illustrated with diagrams.
If you need to rewrite any answer and there is not enough space to do so on the
original page, you must use the extra lined page(s) provided at the back of thisbooklet. Remember to draw a line through your original answer.
If you use the extra page(s), you MUST write the question number clearly inthe box provided at the top of the extra page(s) and, where relevant, includethe question part beside the answer.
5
6.
Copyright @ 2015 Caribbean Examinations CouncilAll rights reserved.
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SECTION A
AnswerALL questions in this section.
Write your answers in the spaces provided in this booklet.
In an experiment, some students put corn seeds into each of two test tubes labelled A andB, as shown in Figure l.
20"c 10 "c
Moist cotton wool
Figure 1. Apparatus and materials used for experiment
(i) Write a suitable aim for this experiment.
(2 marks)
(iD In which of the tubes, A or B, would germination most likely occur? Give ONEreason for your answer.
(2 marks)
(iii) State TWO roles that the moisture from the coffon wool plays in the process ofgermination.
(ii) Using the human species as an example, explain why physical appearance ormorphology isNOT always useful for identiffing organisms belonging to the same
species.
(2 marks)
(iiD Suggest ONE reason why biologists use the biological concept of species insteadof physical characteristics to classiff organisms.
(2 marks)
Some lizards were washed away on a log during a hurricane and landed on a remote island.Several years later, they were classified as a new species.
(i) Using the biological concept of a species, state TWO reasons why they werereclassified.
(2 marks)
(ii) The new species of lizards living in the mountainous region of the island werefound to be smaller than those living on the lowlands. Suggest TWO reasons forthis variation.
(2 marks)
Total 15 marks
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(c)
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3. (a) Figure 4 illustrates the events that take place during the human menstrual cycle.
Hormone Y
Hormone X
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Figure 4. Human menstrual cycle
Identifu Hormones X and Y and the event occuning at Z.
x ...............
Y ...............
Z
(ii) What is the role of EACH hormone in the menstrual cycle?
(iiD Name the organ that produces Hormones X and Y.
x
(2 marks)
(i") Discuss the fate of the following structures shown in Figure 4 if fertillzation ofthe ovum occurs.
Corpus luteum
Uterus lining
(4 marks)
Some contraceptive pills contain hormones. Suggest how this may prevent pregnancy.
(1 mark)
A drug company is developing a male contraceptive pill. Suggest THREE ways in whichthis could prevent pregnancy.
(3 marks)Total 15 marks
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Y
(b)
(c)
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SECTION B
Answer ALL questions in this section.
Write your answers in the spaces provided in this booklet.
(i) Explain how structures in the human eye control the amount of light that entersthe eye.
(4 marks)
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(iD Jenny enters a dimly lit room and cannot see the colours of the furniture until thelights are switched on. Explain how Jenny is able to discern objects in the dimlylit room but cannot see the colours until the lights are switched on.
(5 marks)
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A certain form of colour-blindness is inherited as a recessive allele carried on the Xchromosome. It is thus said to be 'X-linked'or'sex-linked'. Awoman with normal colourvision, whose father is colour-blind, mates with a colour-blind man. What is the chanceof them having colour-blind children? Use a genetics diagram to explain your answer.
Use B for the allele for normal vision and b for the allele for colour-blindness.
Describe the chemical digestion of carbohydrates, fats and proteins from the mouth untilthey are absorbed in the small intestines.
(6 marks)
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(b) (D Describe how the body systems work together to assimilate glucose molecules
(4 marks)
(ii) Explain how the assimilation of glucose by a non-diabetic person differs from thatof a person suffering from diabetes.
(5 marks)
Total 15 marks
GO ON TO THE NEXT PAGE012070208 20t7
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Using a suitable example of EACH, distinguish between a predator-prey relationship and
parasitism.
(6 marks)
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Some environmentalists encourage the practice of introducing predators to an ecosystemto control a population of pests rather than the use of agricultural chemicals.
(i) Outline THREE advantages and THREE disadvantages of this method ofbiologicalcontrol compared to the use of chemicals.