CSEC Human and Social Biology Paper 2 May/June 2022 - Free CXC Past Paper with Answers

Write the balanced chemical equation for the process of photosynthesis.

Figure 2 shows a diagram of the carbon cycle.

Identify the processes labelled X, Y and Z in Figure 2.

X: Y: Z:

Name ONE organism which causes decomposition in Figure 2.

The residents in a village clear land for agriculture by burning away trees, shrubs and grass.

Discuss how this practice could contribute to global warming.

Explain ONE way in which global warming could impact Caribbean territories.

Suggest THREE ways in which carbon emissions could be reduced.

Define the term 'mitosis'.

Identify the stage, A, B, C or D, in Figure 3 which shows the telophase.

State the type of reproduction in which mitosis takes place.

State TWO features of the process of mitosis.

Distinguish between a 'pandemic' and an 'epidemic'.

Table 3 shows selected drugs and their classification. Complete Table 3 by inserting a missing drug or its classification. The first row has been completed for you.

TABLE 3: CLASSIFICATION OF SELECTED DRUGS

Figure 5 is a graph which shows trends observed in the smoking of cigarettes and the practice of vaping among secondary school students in a certain country.

Figure 5. Trends in cigarette smoking and vaping among secondary school students

State ONE healthy trend and ONE unhealthy trend that can be observed from the graph in Figure 5.

Nicotine impairs brain development resulting in a lack of focus and poor judgement. Explain ONE social impact and ONE economic impact that could result from the unhealthy trend observed in Figure 5.

Studies have shown that vaping leads to an increased number of bacteria on the teeth. Suggest the dental problem that persons who vape are MOST likely to develop. Explain your answer.

State TWO other negative health effects that could result from the practice of vaping.

Identify the contraceptive method which resulted in the LEAST number of pregnancies and explain why this method is the MOST effective.

Identify the contraceptive method which resulted in the GREATEST number of pregnancies and explain why this method is the LEAST effective.

State which of the other contraceptive methods in Figure 4 was shown to be as effective as the pill.

Suggest TWO reasons why the degree of effectiveness for the pill as shown in Figure 4 is not as high as expected.

Briefly describe EACH of the following processes in the water cycle:

Evaporation

Condensation

Precipitation

Filtration

Lana lives in a village near to an airport. Although each house in the village has its own septic tank, water from pipes and washing machines flows freely into the gutters of the roads. After heavy rains, the water by the beach near to the village becomes cloudy. The sanitation service collects garbage once every three weeks, which results in the accumulation of large piles of garbage bags between collection dates.

Define the term 'pollution'.

List THREE types of pollution that Lana's village experiences and state ONE likely impact of EACH type of pollution.

Suggest THREE ways in which the residents in Lana's village could reduce the negative impacts of pollution.

Identify the structures labelled A and B and state ONE function of EACH structure.

State ONE example of a spinal reflex action and ONE example of a cranial reflex action.

Frank awoke from a three-month coma and must now learn to walk again.

Explain the process that must occur in his nervous system to enable him to take a step.

Identify the neurotransmitter that is associated with the process in (c) (i) and describe how the signal will move from one neuron to another.