CSEC Biology Paper 2 May/June 2007 - Free CXC Past Paper with Answers

Figure 3 is a diagram of the elbow joint.

Figure 3. Diagram showing the elbow joint

Name the type of joint illustrated in Figure 3.

Label the diagram to illustrate the MAIN features of a joint.

In the diagram at Figure 3, a pad of fat is shown. Suggest ONE function of this feature in the elbow joint.

People who suffer from arthritis experience pain because certain parts of the joint are worn away. Identify TWO parts of the joint that are likely to be worn away.

Figure 4 illustrates two mammalian vertebrae.

Figure 4. Diagram of two mammalian vertebrae

Name EACH vertebra shown in Figure 4.

Vertebra I:

Vertebra II:

Name THREE features that have similar functions in the two vertebrae shown in Figure 4.

Identify ONE feature that distinguishes between the two vertebrae.

The pupils of the human eye illustrated in Figure 5 show different responses to external stimuli.

Figure 5. Pupils of the human eye responding to stimuli

Identify the stimulus for EACH pupil in Figure 5.

Stimulus for Pupil I:

Stimulus for Pupil II:

For Pupil II in Figure 5, describe how the response came about.

How are the responses illustrated by the pupils in Figure 5 important to humans?

The diagram of the eye at Figure 6 shows how the lens appears in a short-sighted person.

Figure 6. Diagram of the eye of a short-sighted person

Using arrows, show on Figure 6 where an image that is viewed by this person would normally fall in relation to the retina.

Innovations in treating eye defects include lens replacement. On the diagram below, draw the lens that is likely to correct the defect shown in Figure 6, if lens replacement is done.

Although plants have no specialized organs of sensitivity such as the eye, they also respond to external stimuli. Explain TWO ways in which the response in plants is different from the response to external stimuli by humans.

Figure 7 below shows the longitudinal section of a tomato fruit.

Figure 7. Longitudinal section of a tomato fruit

Complete Figure 7 by labelling SIX parts of the fruit.

The seeds of the fruit shown in Figure 7 are dispersed by animals. Identify TWO ways in which these seeds are adapted for this process.

Figure 8 below shows the green and dry stages of a legume.

Figure 8. Green and dry stages of the same fruit of a legume

What type of dispersal is shown by the fruit illustrated in Figure 8?

Give TWO reasons why the plant parts illustrated in Figures 7 and 8 are classified by biologists as fruits.

Suggest ONE similarity and TWO differences in the ways in which the ovary in humans and in plants functions.

Similarity: Differences:

Complete Table 3 below by writing an example and the cause of EACH type of disease listed.

TABLE 3: TYPES OF DISEASES

Figure 9 below gives some data on factors affecting the transmission of HIV and AIDS in the Caribbean.

Figure 9. Factors affecting the transmission of HIV and AIDS in the Caribbean

Using information from the pie chart, give the THREE most common ways in which HIV and AIDS are spread in the Caribbean.

Suggest TWO ways in which people in the Caribbean can reduce the spread of HIV and AIDS.

Identify TWO symptoms of AIDS.