CSEC Human and Social Biology Paper 1 January 2020 - Free CXC Past Paper with Answers

The ability of a living organism to detect and respond to changes in its environment is referred to as

Items 2-3 refer to the following processes. (A) Osmosis (B) Diffusion (C) Photosynthesis (D) Active transport In answering Items 2-3, each process may be used once, more than once or not at all.

Which process describes the spread of gases throughout a room?

Which process describes the absorption of water by plant roots?

Item 4 refers to the following trophic pyramid.

[Diagram of trophic pyramid]

Based on the trophic pyramid above, which of the following statements is NOT true?

The producers supply the most energy.

The herbivore level provides less food than the producer level.

The amount of available energy decreases with each successive level.

The total mass of living organisms that can be supported at each higher level increases.

Which cell organelle is responsible for respiration?

Benedict's solution and iodide solution are used to test for which of the following food nutrients?

Reducing sugar / Starch

Starch / Reducing sugar

Nonreducing sugar / Starch

Starch / Nonreducing sugar

Which of the following actions would MOST likely increase the chances of our food being contaminated by bacteria?

Storing food in the refrigerator

Keeping raw meat and cooked meat apart

Leaving food on the stove top until everyone has eaten

Washing hands, before and after using the toilet

Which of the following conditions is a direct result of malnutrition?

Which of the following micronutrients is essential for the development of red blood cells in infants?

Which of the following substances has NO nutritive value in a balanced diet?

Item 11 refers to the following vertical section through a molar tooth.

Which of the following rows shows the correct function of EACH of the parts labelled P, Q and R?

Amino acids derived from protein are an essential component of our diet because they

provide much of our energy needs

are a good storage form for energy

are used in the building up of new cells

speed up the metabolic reactions in the body

The part labelled X is responsible for the digestion of

The region of the alimentary canal that is acidic is the

What is the function of the incisor in the digestion of food?

Which stage in the breathing process is represented in the model?

A contracted diaphragm

Which of the following products BEST completes the equation for aerobic respiration? Glucose + oxygen →→→

carbon dioxide + water

carbon dioxide + water + energy

carbon monoxide + water + energy

carbon monoxide + lactic acid + energy

Which of the following sequences shows the path taken by air moving into the lungs?

Trachea → bronchioles → bronchi → alveoli

Trachea → alveoli → bronchioles → bronchi

Trachea → bronchi → bronchioles → alveoli

Trachea → bronchi → alveoli → bronchioles

Pulmonary circulation involves the passage of blood from the

heart to the lungs and back

lower parts of the body to the heart

heart to the rest of the body (excluding the lungs)

The vital capacity of a healthy person is approximately 3.5 dm³. Which of the following persons will MOST likely have a vital capacity LESS than 3.5 dm³?

A 30-year-old female marathon runner

A 30-year-old female, smoking for ten years

A 60-year-old male saxophone player of ten years

A 60-year-old male who walks two kilometres daily

High blood pressure MOST likely leads to

Item 22 refers to the following chart. Blood Solid Liquid I II III IV

Which of the following labels correctly identifies plasma?

When there is bleeding from a cut through a person's skin, blood clots are formed when platelets become entangled in

the dermis of the skin

fibrin in the blood vessels

hair erector muscles of the skin

white blood cells in the blood vessels

Which of the labelled structures contains marrow?

Which of the following structures allows substances to pass through its wall?

Which pair of bones is found in the lower arm?

Clavicle and scapula

A ball-and-socket joint is located

between the skull and the neck

where the arm meets the shoulder

The point of origin of the triceps is indicated at

The form of energy (measured in calories) that warms up the body is referred to as

Which of the following metabolic products of the human body is toxic?

The area of the brain which acts as a thermostat in the regulation of body temperature is the

Which of the following responses occurs in the body when the blood glucose level is too high?

Fat is broken down to glucose.

The pancreas secretes glycogen.

Glucose is absorbed by nerve cells.

The liver converts glucose to glycogen.

One function of the spinal cord is to

activate the eye muscles

transfer information to the brain

transfer information to the endocrine glands

coordinate the movement of the arms and legs

Which of the following treatments is BEST for a cataract of the eye?

The use of convex lenses

The use of concave lenses

The intake of daily supplements of vitamin A.

The replacement of the eye lens by means of surgery

The human eye forms a clear image of an object on its

Which of the following functions is true for a receptor in the nervous system?

Carries information as an electrical impulse

Allows muscle to move when a stimulus is received

Receives stimuli and converts them to electrical impulses

Helps to maintain the internal environment in the body

Item 37 refers to the following diagram which shows a vertical section through the human brain.

Which region is responsible for conscious action or thought?

Which of the following comparisons is true for sexual and asexual reproduction?

Involves gametes / No gametes

Identical offspring / Variation occurs

Produces many offspring quickly / Produces fewer offspring because the process is slow

Which labelled structure represents the prostate?

Which of the following phrases may be tru about prenatal care? I. Keeps the mother on a strict die and exercise programme II. Monitors the development of the foetus III. Helps the mother to properly car for the baby after birth

Which of the following birth control methods is an injectable contraceptive which prevents the release of the ovum for 8 to 12 weeks?

An example of discontinuous variation in humans is

two identical daughter cells

four identical daughter cells

two non-identical daughter cells

four non-identical daughter cells

A cell is described as being diploid when

the chromatids align at the equator of the cell

it divides to give four different daughter cells

it has the full chromosome number

it undergoes meiosis

Which of the following is a DISADVANTAGE of genetic engineering in food production?

Longer shelf life for fruits

Production of super weeds

Wheat that can fix atmospheric nitrogen

Production of sugar cane in cold climates

Which of the following practices is MOST effective in limiting the spread of HIV?

Abstaining from sexual activity

Using a condom during intercourse

Providing educational information about the disease in communities

Encouraging persons to restrain from having multiple sexual partners

Which of the following is NOT a stage in the life cycle of a mosquito?

Persistent coughs, spitting blood, fever, night sweats and fatigue are signs and symptoms indicative of

Which of the following is NOT a primary symptom of asthma?

Which of the following statements about personal hygiene are true?

I. It eliminates body odours. II. It prevents infections. III. It promotes social acceptance.

A pit latrine can affect water quality by

encouraging the breeding of mosquitoes

encouraging rodents to frequent water sources

allowing the seepage of raw sewage into the water table

causing the discolouration of water in wells, streams and rivers

Which sector contributes the MOST to greenhouse gases?

Industrial processes

Transportation fuels

Agricultural by-products

Biodegradable substances are BEST described as those which can

be broken down naturally

be reused to produce new products

exist in the environment for several years

be considered a health hazard to living organisms

Item 54 refers to the following effects of drug abuse. I. Headache II. Depression III. Upset stomach IV. Frustration

Two psychological effects from the list above are

Which of the following substances will cause rainwater to become acidic?

Pollution is BEST described as the

disposal of domestic waste

disposal of harmful substances in water

contamination of land, water and air by harmful microorganisms

contamination of land, water and air by harmful substances

Which of the following phrases would describe a disinfectant as opposed to an antiseptic? I. Applied to inanimate objects to kill microbes II. Applied to living tissue to kill microbes III. Kills microbes without poisoning or destroying human tissue

Item 58 refers to the following graph which shows the incidence of respiratory diseases in a community close to a landfill.

The number of persons suffering from respiratory diseases between 1990 and 2010 is

Vectors may be defined as

organisms that cause the spoilage of foods

organisms that cause living things to become ill

the carriers of disease-causing organisms from source to hosts

living organisms that transfer disease-causing organisms from one host to another

Contamination of water sources is detrimental to humans because of the spread of water-borne diseases such as

CSEC Human and Social Biology Paper 1 January 2020 - Free CXC Past Paper with Answers

CSEC Human and Social Biology Paper 1 January 2020 Questions