Free CXC Human and Social Biology Paper 2 May/June 2007 past paper from 2007. 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 2007 - Free CXC Past Paper with Answers
Free CXC Human and Social Biology Paper 2 May/June 2007 past paper from 2007. 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.
Explain the principles of a food chain.
[2 marks]
Account for the variation of available energy in a food chain.
[3 marks]
Give an example of an aquatic food chain.
[2 marks]
A pesticide gets into the food chain below. Which animal would have the highest accumulation of the pesticide? Explain your answer.
Chicken fox lion
Animal:
Reason:
[3 marks]
Figure 1 below shows the structure of a long bone.
Identify EACH of the parts labelled A to C in Figure 1.
A: B: C:
[3 marks]
State FOUR functions of the skeleton.
[4 marks]
State whether bone is dead or living tissue. Explain your answer.
[3 marks]
Define a reflex action.
[2 marks]
Give an example of a reflex action.
[1 mark]
Miriam accidentally touches a hot pot and quickly withdraws her hand. Describe the series of events in the nervous system which causes Miriam to react this way.
[6 marks]
Explain the importance of Miriam's reaction.
[1 mark]
Explain the concept of gaseous exchange in humans.
[2 marks]
What kind of reaction is responsible for the liberation of carbon dioxide in red blood cells?
[1 mark]
In what form is most of the carbon dioxide transported in the blood?
[1 mark]
Give TWO examples of events which may cause the arrest (stoppage) of breathing movements.
[2 marks]
For any ONE example named in (c) (i) above, explain how breathing can be re-started.
[4 marks]
Name THREE fat-soluble vitamins.
[3 marks]
Trevor has ingested a meal rich in fat-soluble vitamins. Explain how the fat-soluble vitamins are absorbed from the alimentary tract into the circulatory system.
[2 marks]
Explain why less Vitamin C is lost when vegetables are plunged into boiling water.
[2 marks]
Jenny is suffering from a deficiency of Vitamin C. What may be some of her symptoms?
[3 marks]
Define the term 'excretion'.
[2 marks]
Name TWO excretory organs, OTHER THAN the kidneys.
[2 marks]
The kidneys regulate blood composition in three ways. One way is by removing excess water. Identify TWO OTHER ways.
[2 marks]
How do the kidneys assist in maintaining blood pH?
[1 mark]
Brian sweats profusely during a cricket game. Explain how the sweat reaches the surface of the skin.
[3 marks]
Why does Mr Garcia frequently forget where he left his keys?
[1 mark]
Why does Mr Garcia have very shaky hands?
[2 marks]
Name ONE symptom, OTHER THAN those mentioned in (i) and (ii) above, likely to be experienced by Mr Garcia.
[1 mark]
What condition is Mr Garcia likely to have?
[1 mark]
Explain why Mr Garcia may NOT be considered a safe driver.
[3 marks]
What advice would you give to an expectant mother regarding alcohol?
[2 marks]
Figure 2 below represents a sewage treatment plant. Explain what occurs at EACH of the points labelled A, B and C.
A: B: C:
[4 marks]
Explain what is a disinfectant.
[1 mark]
The Public Health Authorities want to spray a landfill with a disinfectant. Explain why this is NOT advisable.
[3 marks]
In recent years, plastics have been creating a major problem for landfills. Describe the problem of plastics in landfills.
[1 mark]
How is the problem described in (c)(i) above being addressed?
[1 mark]
After severe flooding in a country, there is an outbreak of cholera.
After severe flooding in a country, there is an outbreak of cholera. What is meant by the word 'carrier' as it relates to cholera?
[2 marks]
Describe how carriers, flood and disease outbreaks are linked.
[4 marks]
The Health Authorities suspect that Sushma has contracted cholera. What treatment should be administered to her, even before she visits the doctor?
The Health Authorities suspect that Sushma has contracted cholera. What treatment should be administered to her, even before she visits the doctor?
[1 mark]
Why is this treatment necessary?
[3 marks]
Compare the structure and function of veins and arteries.
Structure Veins: Arteries:
Function Veins: Arteries:
[4 marks]
How does the structure of the right chambers of the heart (the atrium and ventricle) relate to the functions of the right chambers?
Atrium Structure: Function:
Ventricle Structure: Function:
[6 marks]
SECTION B Answer ANY TWO questions. Write your answers on the pages provided at the end of this booklet.
State ONE characteristic of living things which is common to both plants and animals and ONE characteristic which is NOT common to both plants and animals.
[2 marks]
Describe the structure of a plant cell.
[3 marks]
Explain the importance of EACH of the following processes to the growth of the plant: a) Diffusion b) Osmosis c) Active transport
[14 marks]
What feature of the structure of a leaf makes it suitable for diffusion to occur?
[1 mark]
Guydath notices that most of his classmates can sit at their desks and read easily from the chalkboard or from their books. His teacher, Miss Angela, has to hold her book at arms' length in order to read it.
Explain how the human eye makes adjustments to see near and distant objects.
[5 marks]
What is the name of the process explained in (a)(i) above?
[1 mark]
Explain why the near point of vision of most of the students is shorter than the near point of vision of Miss Angela.
[3 marks]
Guydath sees objects that are distant but not those that are near.
What are the causes of long-sightedness?
[2 marks]
How does the eye respond to light rays to manifest long-sightedness, and how can Guydath's problem be corrected?
[4 marks]
What is astigmatism and how can it be corrected?
[5 marks]
As a health educator you are addressing a church youth group.
What is Acquired Immune Deficiency Syndrome (AIDS)?
[1 mark]
Name the virus that causes AIDS.
[1 mark]
List THREE ways in which the AIDS virus may be spread.
[3 marks]
Describe how the virus which causes AIDS enters the body.
[3 marks]
Explain how full-blown AIDS develops from the time the virus enters the blood.
[9 marks]
Give THREE reasons why Caribbean people must be concerned about the AIDS epidemic.
[3 marks]
Name TWO ways of purifying water in the home.
[2 marks]
List THREE activities of man which negatively affect water supplies.
[3 marks]
For EACH activity listed in (b) (i) above, write ONE paragraph to explain how it affects water supplies.
[15 marks]