CSEC Human and Social Biology Paper 2 May/June 2006 - Free CXC Past Paper with Answers

Complete EACH of the following sentences by choosing the correct answer from the words in brackets at the end of the sentence.

The nervous system consists of two parts: the ________________________________________________ nervous system and the ________________________________________________ nervous system. (central, automatic, autonomic)

The sympathetic nervous system and the ________________________________________________ nervous system are parts of the autonomic nervous system. (systematic, parasympathetic)

The nerves of the sympathetic nervous system originate in the ________________________________________________. (brain, spinal cord)

The function of the sympathetic nervous system is to initiate ________________________________________________ action. (emergency, involuntary)

One bodily change that occurs when the sympathetic nervous system is stimulated is ________________________________________________. (dilation of blood vessels, constriction of pupils)

Neurosis is a form of mental illness.

Under what circumstances does this disease originate?

Identify THREE characteristics exhibited by persons suffering from neurosis.

Describe the pacemaker of the heart.

Describe the sequence of events associated with the proper functioning of the pacemaker.

Describe the events occurring in the heart during a heart attack.

State THREE characteristics of enzymes.

Using your knowledge of enzymes, explain EACH of the following:

Milk that has been boiled and then covered keeps longer than fresh milk.

Raw meat keeps longer in a refrigerator than in open air.

Fish that has been dried quickly in the sun keeps longer than wet fish.

Define the term 'heat'.

Name ONE quantity that must be known in order to determine the amount of heat associated with a body.

Name the process by which man generates heat under normal circumstances.

State the normal temperature of human beings.

Describe how your body attempts to maintain a constant temperature when you are (i) in an extremely cold air-conditioned room (ii) outdoors on a very hot day.

in an extremely cold air-conditioned room

outdoors on a very hot day.

Your older sister is about to become a mother. Explain to her the changes that occur in the uterus and cervix just before and during the birth of the baby.

Define the term 'spontaneous abortion'.

Name ONE form of treatment that could be given to women prone to spontaneous abortion.

Give TWO reasons accepted in some Caribbean countries to justify induced abortion.

What are chromosomes?

Using an example, explain the term 'dominance' as it applies to heredity.

A tall couple produces a dwarf offspring. With the aid of a diagram, explain to the husband how it is possible for him and his wife to have dwarf children.

Explain the term 'immunity' as it relates to diseases.

Using examples, explain TWO natural methods by which immunity is acquired.

Baby Dalip was vaccinated at six months of age. Explain the process by which the vaccines work.

Differentiate between the signs and symptoms of a disease.

Signs:

Symptoms:

Using the common cold, give ONE example of a sign and ONE example of a symptom.

Example of a sign:

Example of a symptom:

What occurs in the respiratory system when a stimulus triggers an asthmatic attack?

Give TWO examples of stimuli which may trigger an asthmatic attack.

Describe how water can be tested for bacteria.

Describe THREE ways in which human activities adversely affect our water supplies.

Using specific examples, explain why contaminated water is harmful to human health.