CSEC Human and Social Biology Paper 2 May/June 2021 - Free CXC Past Paper with Answers

Figure 1 shows a diagram of part of a food chain.

Figure 1. Food chain

State what the arrows labelled A represent in Figure 1.

State what is occurring at the arrow labelled B in Figure 1.

Identify the organism that is the primary consumer and the organism that is the producer in the food chain above.

Primary consumer: Producer:

Identify EACH structure labelled A and B.

Structure A Structure B

Complete the paragraph below by selecting the TWO correct responses from the words and phrases provided in the box below.

negative feedback, positive feedback, control of body temperature, childbirth

Homeostasis is the way in which constant conditions are maintained in the body, despite changes in the environment. When the body detects changes within its environment and produces a response to bring it back to normal, this describes a 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Frequent urination

Extreme thirst

In addition to frequent urination and extreme thirst, one of the friends, Pedro, experienced dizzy spells and lethargy the next day.

State the effect that drinking alcoholic beverages would have on Pedro's blood glucose levels.

Explain how Pedro's body would respond to eliminate the effect stated in (i).

Suggest the disease that Pedro is MOST likely suffering from and state why he would have experienced dizzy spells and lethargy.

Table 3 shows the steps involved in the large-scale purification of water from a dam. Complete Table 3 by numbering EACH step in the process, in the correct order. One step has been numbered for you.

TABLE 3: STEPS IN LARGE-SCALE WATER PURIFICATION

State TWO ways in which human activity could negatively impact water supplies.

Leah lives in a rural village where most residents make their living by raising animals and growing crops. Recent rains have left the village flooded and Leah plays in the flood water from early in the morning to late in the evening.

State the TWO contaminants that Leah and her community could be exposed to after the flood.

Suggest THREE diseases that Leah and her community are likely to contract as a result of the flooding.

Recommend FOUR precautions that the residents could take during the flooding crisis to prevent the spread of diseases.

Identify TWO bones located in the chest region of the skeleton.

State TWO functions of the skeleton, other than movement.

Compare the movement of a hinge joint with the movement of a ball and socket joint.

After class, Tina was having an argument about ligaments and tendons. She believed that ligaments and tendons are the same because both are made up of connective tissue and are attached to bones.

Explain why Tina's belief was not entirely accurate.

A middle-aged man goes to the clinic complaining of stiff, painful joints and a decrease in mobility.

Suggest the condition from which he MOST likely suffers and explain how he may have developed this condition.

State ONE example of continuous variation and ONE example of discontinuous variation.

Continuous variation Discontinuous variation

State TWO reasons why genetic variation is important to organisms.

The Aedes aegypti mosquito lives in warm climates and lays its eggs in stagnant water. Meteorologists predict that the Caribbean will have longer dry seasons but when it rains, it would often result in flooding. Surprisingly, scientists predict that there could be an increase in the spread of mosquito-borne diseases during the long dry seasons.

Name the disease that the Aedes aegypti mosquito carries and identify ONE other mosquito-borne disease.

Explain why scientists are predicting that long dry seasons could increase levels of mosquito-borne diseases.

Brendon is a 10-year-old boy who does not like to bathe or change his dirty clothes. Aside from an awful body odour, explain to Brendon THREE health challenges he may experience as a result of these practices.