Free CXC Human and Social Biology Paper 2 May/June 2011 past paper from 2011. Includes a worked answer key. Open the PDF, take a timed test, and study with AI on Caribbean AI.
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CSEC Human and Social Biology Paper 2 May/June 2011 - Free CXC Past Paper with Answers
Free CXC Human and Social Biology Paper 2 May/June 2011 past paper from 2011. Includes a worked answer key. Open the PDF, take a timed test, and study with AI on Caribbean AI.
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Every question from this paper as text. See the answers and worked solutions. Questions are the property of the Caribbean Examinations Council; Caribbean AI is not affiliated with CXC.
Answer ALL questions in this section.
Write your answers in the spaces provided in this booklet.
[15 marks]
The Caribbean region often experiences outbreaks of dengue, and sometimes malaria.
Name the vector that transmits a) dengue b) malaria.
[2 marks]
The organism that causes malaria is plasmodium.
Name the organism that causes dengue.
[1 mark]
State TWO signs or symptoms of dengue.
[2 marks]
Identify ONE method of preventing the spread of dengue.
[1 mark]
Figure 1 shows the trend in tourist arrivals for two Caribbean countries, and Table 1 shows the data for the outbreak of the flu in Country X and Country Y.
Figure 1. Tourist arrivals for Country X and Country Y
TABLE 1: NUMBER OF PERSONS AFFECTED BY THE FLU EACH MONTH
| Month | Dec | Jan | Feb | Mar | Apr | May | June | July | Aug | Sept | Oct | Nov |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Country X | 300 | 600 | 1200 | 900 | 600 | 300 | 100 | 50 | 50 | 400 | 100 | 50 |
| Country Y | 200 | 400 | 800 | 1600 | 1200 | 700 | 400 | 100 | 50 | 50 | 50 | 30 |
The data for Country Y in Table 1 has been plotted on Figure 2 on page 5. Plot the data for Country X on the same grid in Figure 2.
[4 marks]
Describe the trend in the population contracting the flu virus in Country X and Country Y.
Country X: Country Y:
[3 marks]
Examine the graphs in Figure 1 and Figure 2. Describe the relationship between tourist arrivals and the spread of the flu virus in both countries.
[2 marks]
Peggy has been eating three meals a day and still feels weak and tired. She goes to the clinic and her doctor tells her that she could be lacking some vitamins and minerals.
List TWO vitamins other than vitamin A, and ONE mineral that could be lacking in Peggy's diet.
Vitamins: Mineral:
[3 marks]
Name a water-soluble vitamin.
[1 mark]
Name ONE nutrient other than a vitamin or mineral that could be lacking in Peggy's diet which could cause her to feel weak and tired.
Nutrient:
[1 mark]
Identify the end-product of the digestion of the nutrient named in (a) (iii) above.
End-product:
[1 mark]
Figure 3 is a diagram of part of the human alimentary tract.
Figure 3. Diagram of part of the human alimentary tract
[9 marks]
State ONE function of EACH of the parts labelled A and B in Figure 3.
A
B
[2 marks]
Peggy’s pharmacist suggests that she may need some amino acids in her diet so she adopts a protein-rich diet.
Describe the digestion of proteins in the stomach and the small intestine.
Stomach:
Small intestine:
[5 marks]
Suggest TWO benefits of amino acids to Peggy’s body.
[2 marks]
Mary and Suresh are playing with mummy’s perfume in the bedroom. Mummy smells the perfume as she is preparing dinner in the kitchen.
Name the process that allows the scent of the perfume to travel from the bedroom to the kitchen.
Process:
[1 mark]
How does the process in (a) (i) above differ from osmosis?
[2 marks]
Define the term ‘active transport’.
[2 marks]
State ONE part of the body where active transport occurs.
[1 mark]
Name the part of the cell where active transport takes place.
[1 mark]
Anna-Nicole has difficulty breathing after running long distances. She has been told that she may have problems with her circulation.
Suggest how problems with her pulmonary circulation could account for her symptoms.
[3 marks]
The heart is a four-chambered organ whose walls are made up almost entirely of muscles.
How would a problem associated with the walls of the heart affect the systemic circulation?
[3 marks]
Another component of the circulatory system is the lymphatic system.
State TWO functions of the lymphatic system.
[2 marks]
Figure 4 shows part of the respiratory system of a human being.
[15 marks]
Label the diagram at the points marked A, B and C.
[3 marks]
Fill in the blank spaces in the following sentence.
On breathing in, the ribcage moves _________________________ and _________________________ while the diaphragm _________________________.
[3 marks]
Mr Speedy, a middle-aged man, decides to train for a sprint competition. Since retiring from sports, Mr Speedy has become a heavy smoker. He sets off on a 100 m sprint but by the halfway mark he experiences pain in his legs and sides. He cannot complete the sprint. He remains bent over, breathing through his mouth for several minutes.
[9 marks]
Suggest how the changes in the process of respiration (aerobic and anaerobic) might be responsible for Mr Speedy being unable to complete the sprint.
[2 marks]
Explain why his heart rate increases during the sprint.
[2 marks]
Account for the pain in his leg muscles.
[2 marks]
Explain why Mr Speedy has to breathe through his mouth.
[2 marks]
How does Mr Speedy's smoking contribute to his inability to complete the sprint?
[1 mark]
SECTION B
Answer ALL questions in this section.
Write your answers in the spaces provided at the end of each question.
Figure 5 shows part of the human female reproductive system, and Figure 6 shows part of the human male reproductive system.
[15 marks]
Label the oviduct and vagina on Figure 5.
Label the prostate gland and the urethra on Figure 6.
Concerning the passage of gametes and urine, state ONE major difference between the male and female reproductive systems.
[6 marks]
Vishana is nine months pregnant and has been told that it is almost time for her to deliver her baby. Describe the THREE stages of the birth process.
[5 marks]
Vishana is fearful of becoming pregnant again too soon but is undecided about using contraceptives because she believes her baby may be harmed.
[4 marks]
Suggest ONE natural method of birth control and give ONE disadvantage of using this method.
[4 marks]
State TWO benefits of family planning to a country.
Write your answer to Question 6 here.
[15 marks]
State what is meant by EACH of the following terms:
[6 marks]
Identify TWO ways of decreasing the volume of solid waste, other than by reducing the production of such waste.
[6 marks]
Explain how the proper construction and location of pit latrines contribute to improved health in communities without pipe-borne water supplies.
[4 marks]
Persons in a remote community have heard about an outbreak of cholera and they need information. Write the information that should be put in a brochure to advise this community about
[5 marks]