Free CXC Human and Social Biology Paper 2 May/June 2017 past paper from 2017. 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 2017 - Free CXC Past Paper with Answers
Free CXC Human and Social Biology Paper 2 May/June 2017 past paper from 2017. 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.
< ![CDATA[Rebecca carries out the following food tests on a sample of food in the laboratory and obtains the results shown in Table 1.
TABLE 1: RESULTS OF TESTS ON FOOD SAMPLE
[15 marks]
Rebecca carries out the following food tests on a sample of food in the laboratory and obtains the results shown in Table 1.
TABLE 1: RESULTS OF TESTS ON FOOD SAMPLE
Based on the data in Table 1, suggest the macronutrients which are present in the food sample and the macronutrient which is absent.
Present 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Absent 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[3 marks]
Circle, from the choices below, the food that is MOST likely Rebecca's test sample.
Mango Fried chicken French fries Beef patties
[1 mark]
Define the term 'balanced diet'.
[2 marks]
Discuss how a balanced diet would differ for EACH of the following groups:
[4 marks]
Reza is taking 500 mg of vitamin A daily to treat his poor eyesight. His friend says that all he needs is 90 mg a day and therefore he is wasting his money. What would MOST likely happen with the excess vitamin A?
[1 mark]
Name a disease which is MOST likely to develop from a deficiency of EACH of the following: Vitamin C Iron Vitamin D
[3 marks]
State ONE reason why fibre is an important part of the diet.
[1 mark]
Figure 1 shows a diagram of the human heart.
Identify the parts labelled X and Y.
[2 marks]
State ONE function of the part labelled X.
[1 mark]
Complete the following table for A, B and C.
[3 marks]
Charlotte and George, both nine years old, love to play. Charlotte notices that after a few hours of playing, George complains of feeling tired. George is taken to the doctor and diagnosed with sickle-cell anaemia.
Explain why having sickle-cell anaemia would cause George to feel tired.
[4 marks]
The major component of blood is called plasma which contains nutrients and other components.
[5 marks]
Explain the difference between plasma and serum.
[2 marks]
Explain the relationship between plasma and tissue fluid.
[3 marks]
Figure 2 shows a diagram of the muscles, bones and joints of the upper arm.
[6 marks]
Figure 2 shows a diagram of the muscles, bones and joints of the upper arm.
[6 marks]
Which letter identifies the triceps muscle?
[1 mark]
Which letters indicate the origin and insertion of the triceps muscle? Origin Insertion
[2 marks]
Identify the type of joint labelled D.
[1 mark]
State the type of movement that joint D allows.
[1 mark]
Diana's personal trainer asks her to complete 20 biceps curls. This exercise requires her to flex and extend her arm. Discuss how the biceps and triceps muscles work together to achieve this task.
[4 marks]
Diana is exercising to tone her muscles. State what is meant by 'muscle tone' and suggest how it could benefit Diana's joints.
Muscle tone Benefit
[2 marks]
Diana needs to lift a 50-kg weight. Her trainer instructs her to maintain proper posture.
[4 marks]
Advise Diana on the correct way to lift heavy objects.
[3 marks]
Suggest what could happen if Diana does NOT maintain proper posture.
[1 mark]
Homeostasis is necessary for the proper functioning of the body. It includes a negative and a positive feedback mechanism.
[6 marks]
Define the term 'homeostasis'.
[2 marks]
Name TWO organs in the body that are involved in homeostasis and state ONE product that EACH organ excretes. Write your answers in the following table.
[4 marks]
Kenrick has his first meal of the day at 7:00 a.m. It consists of toast with peanut butter, a glass of juice and some fruit. He works through the day and does not eat again until 4:00 p.m.
[5 marks]
After digestion of the toast, glucose enters his bloodstream. Explain the role of hormones in causing the glucose to enter the cells of Kenrick's body.
[2 marks]
Around 4:00 p.m., Kenrick begins to feel listless and suspects that it is as a result of not eating. Upon checking his blood glucose level, he realizes that it is very low. Explain what would take place in his body to raise his blood glucose level.
[2 marks]
As a result of being so hungry, Kenrick eats a very high carbohydrate and fat meal, and soon falls asleep. Suggest what would happen to the excess glucose formed after the digestion of the carbohydrates.
[1 mark]
The effects of lifestyle-related diseases on the human body can be significantly reduced or managed by diet and exercise. Explain how diet and exercise can reduce the risks of ONE lifestyle-related disease.
[4 marks]
SECTION B
Answer ALL questions in this section.
Reshma believes that her sister is having an asthma attack. State TWO signs/symptoms of the disease, TWO factors that may have triggered the disease, and explain to Reshma how asthma affects the respiratory system.
Signs/symptoms
Factors
Explanation
[6 marks]
Explain the difference between an infectious/communicable and a non-infectious/non-communicable disease and give ONE example from EACH category.
[4 marks]
Because infectious diseases can be communicable and can, therefore, become a public health issue, they need to be carefully monitored. Explain the link between poor personal hygiene in males and the incidence of cervical cancer in females. In your explanation, include the benefits of circumcision.
[5 marks]
A bacterium often found in raw sewage is Vibrio cholera. State the disease the bacterium causes and give TWO symptoms of the disease.
[3 marks]
Figure 3 shows a diagram of a drop latrine.
Describe how the drop latrine shown in Figure 3 operates, and recommend a suitable alternative small-scale sewage disposal solution. Justify your recommendation.
[6 marks]
Explain THREE steps a community can take to reduce water pollution.
[6 marks]