CSEC Biology Paper 1 May/June 2008 - Free CXC Past Paper with Answers

Which of the following is a characteristic of a population?

It is a group of different species living in the same habitat.

It is a group of individuals of the same species living in the same habitat.

It is a group of individuals of the same species living in different habitats.

It is a group of different species living in different habitats.

Which of the following is a biotic factor affecting a population?

The diagram shows a food web. Which of the following organisms is a producer?

Which of the following is a secondary consumer in the food web shown?

If the population of small fish decreases, which of the following is likely to happen?

The population of algae will increase.

The population of zooplankton will decrease.

The population of sharks will increase.

The population of algae will decrease.

Which of the following processes is represented by the equation: $6CO_2 + 6H_2O \xrightarrow{light} C_6H_{12}O_6 + 6O_2$ ?

Which of the following is the primary site of photosynthesis in a plant cell?

Which of the following is a product of aerobic respiration?

A mature plant cell is different from a mature animal cell because it has

a large permanent vacuole

a nucleus suspended in the cytoplasm

The process which moves food through the alimentary canal is called

Living organisms feed by using simple inorganic substances or by consuming complex organic substances. Which of the following rows correctly shows the type of substances used or consumed by plants, animals and fungi?

Simple inorganic / Complex organic / Complex organic

Simple organic / Complex organic / Complex inorganic

Complex organic / Simple inorganic / Complex organic

Complex organic / Simple inorganic / Simple inorganic

Which of the following would MOST likely occur if enzymes were NOT present in living cells?

Slow rate of reaction

High rate of reaction

Reaction requiring higher temperatures

Which of the following combinations correctly shows a gas that is a raw material and a gas that is a product, during photosynthesis.

Carbon dioxide / Nitrogen

Oxygen / Carbon dioxide

Carbon dioxide / Oxygen

Bile empties into the

Items 15-16 refer to the figure showing an apparatus used to investigate the process of respiration.

Which of the following products of respira- tion is the apparatus used to show?

On setting up the apparatus, bacteria on peas are killed. This is important so that they will not

use up carbon dioxide

The process responsible for the movement of water upwards in xylem vessels is

Which of the following statements abouL aerobic and anaerobic respiration is correct?

Does not use O2 / Uses O2

Occurs in the cytoplasm / Occurs in the mitochondria

Releases large amounts of energy / Releases small amounts of energy

At least one product is organic / Products are always inorganic

Which ofthe following comparisons between arteries and veins is NOT correct?

Valves present / Valves absent

Blood flows in pulses / Blood flows smoothly

Havethick muscular walls / Have thin walls

Blood low in carbon dioxide / Blood high in carbon dioxide

Item 20 refers to the following diagram of an insect feeding on a plant.

The insect MOST likely obtains its nutrients from the

The molecule used to temporarily store the energy released during the process of respiration is

Which of the following statements about cigarette smoking are correct? I. Results in persistent coughing and shortness of breath. II. There is destruction of the alveolar walls. III. May result in cancer of the lungs, throat, mouth and oesophagus. IV. Blood pressure is lowered.

Items 23-24 refer to the diagrams below which represent some components of blood.

In answering items 23-24, match each item with one of the options above. Each option may be used once, more than once or not at all.

Engulfing disease-causing organisms

The ureter carries urine from the

kidney to the bladder

collecting tubule to the pelvis

nephron to the collecting tubule

bladder out of the body

While the filtrate passes through the kidney tubule, most of the water moves back into the blood stream. This makes the filtrate

Which of the following would NOT represent a form of excretion in plants?

Water vapour diffusing through epidermis

Tannins being stored in dead tissue

Gases diffusing through stomata

Stored calcium oxalate crystals in leaves during leaf fall

Which of the following adaptations in plants is NOT used to conserve water?

Which of the following functions are performed by a rib? I. Blood formation II. Protection III. Locomotion IV. Support

Pelvic girdle, ribs, femur / Skull, humerus, vertebral column

Humerus, femur, ribs / Skull, vertebral column, pelvic girdle

Pelvic girdle, humerus, femur / Vertebral column, ribs, skull

Skull, vertebral column, ribs / Humerus, femur, pelvic girdle

Which of the following types of lens will correct short sightedness?

Which of the following is NOT involved in the reflex action of the body known as the knee-jerk reflex?

Items 33-34 refer to the diagram of the vertebra below.

What type of vertebra is represented?

The structure labelled I allows for the passage of

The following reactions all take place in the skin. I. Blood vessels dilate and constrict. II. Glands produce sweat. III. Hair erector muscles contract. These functions relate to the skin's role as an organ for

mechanical protection only

body temperature control only

both body temperature control and sensitivity to the surroundings

mechanical protection, body temperature control and sensitivity to the surroundings

The eye is sometimes referred to as an effector organ because

the pupil constricts in the presence of bright light

the rods and cones are stimulated by light

images which fall on the retina are sent to the brain

neurones from the eye lead to the central nervous system

The diagram below represents the growth curve of a culture of yeast cells. Which section of the graph shows the MOST rapid rate of growth?

Items 38-39 refer to the following information. The table below gives the glucose content of 5 cm³ samples of blood taken from ten adult patients who were having this test for the first time. Patients were requested not to eat for 12 hours prior to the collection of the sample. The results of the test confirmed that two patients had high glucose levels in the blood, while the blood glucose level was considered within normal limits for the other patients. Patient Blood glucose content in mmol/litre Patient Blood glucose content in mmol/litre 1 4.0 6 18.0 2 6.5 7 6.0 3 11.5 8 6.5 4 3.5 9 4.0 5 5.0 10 5.2

The normal range of glucose in the blood is MOSTlikely

The two patients MOST likely suffering from diabetes (high blood glucose) are

The reproduction of amoeba by binary fission is an example of asexual reproduction because

the cytoplasm is divided into two equal halves

two offspring are produced by one parent

the nucleus divides by mitosis

the nucleus is not involved in the cell division

Items 41-42 refer to the following diagrams showing events that occur in the ovary during the menstrual cycle.

(A) (B)

In answering items 41 - 42, match each item with one of the options above. Each option may be used once, more than once or not at all.

Development of corpus luteum

Items 43-44 refer to the following diagram which shows part of a flower enclosed in a cloth bag, as part of an investigation being carried out on reproduction in plants.

Cloth bag

The cloth bag would NOT prevent

To be effective in controlling how the gametes meet, the bag should be put in place

after pollination but before fertilization

before pollination and fertilization

after fertilization and pollination

before pollination but after fertilization

In a particular plant, red and white flower-colour show co-dominance. If two heterozygous (pink) flowers are crossed, the expected phenotypic ratio of the offspring is

1 red: 2 pink: 1 white

Which of the following is an example of continuous variation in humans?

Natural selection differs from artificial selection because

the environment determines the individual with the beneficial trait

the environment determines the beneficial characteristics

it is a slower process

it involves non-random mating

Item 48 refers to the following diagram of the cross-section of a fruit of an unknown plant found on the shore of a swamp.

Which of the following is MOST likely the method of dispersal?

If a diploid organism has two different alleles for the same gene, it is described as being

A bryophyllum leaf, isolated from the parent plant, will generate new plants as seen below.

Plants are generated quickly.

The new plants show great variety.

It is a cheap way to obtain plants.

One plant can generate hundreds of new plants.

Which of the following statements are true about natural selection? I. There is variation in the population. II. There are more offspring than parents. III. Better adapted organisms survive and reproduce. IV. Species would not change over time.

It is possible to change the characteristics of an organism by inserting pieces of DNA (genes) from one organism into the chromosomes of another. This process is called

artificial selection

Which of the following would NOT contribute to hypertension (high blood pressure)?

Saturated fats in the diet

Immunization is MOST effective in controlling the spread of a communicable disease if

a vaccine is administered to an uninfected individual

serum is administered to an uninfected individual

a vaccine is administered to an infected individual

serum is administered to an infected individual

Which of the following. are direct consequences of disease in man? I. Loss of man hours and productivity II. Loss of human life III. Loss of livestock and crops

The graph indicates that

neither X nor Y will ever be sick again

X has been vaccinated against this disease but not Y

Y has fewer white blood cells than X

Y previously had the disease but not X

The term 'habitat' refers to

an, area where several organisms live

the area in which a particular organism lives

the biological characteristics of an area

the physical characteristic of an area

In which soil sample will a crop of lettuce grow BEST?

Which of the following are reasons to return glass bottles? I. Glass is a non-renewable resource. II. Recycling glass lowers production cost. III. Raw materials are renewable resources. IV. The energy used in bottle making is non-polluting.

Which of the following is NOT an air pollutant?

CSEC Biology Paper 1 May/June 2008 - Free CXC Past Paper with Answers

CSEC Biology Paper 1 May/June 2008 Questions