CSEC Biology Paper 1 May/June 2015 - Free CXC Past Paper with Answers

Which organism is MOST likely an insect?

Which of the following organisms occupies the fourth trophic level in the food chain below?

Cabbage → Caterpillar → Small bird → Hawk

Which of the following relationships may present harm to one of the organisms involved?

I. Commensalism II. Parasitism III. Predation IV. Mutualism

Item 4 refers to the following diagram which shows an apparatus used for collecting organisms.

The apparatus is MOST suitable for collecting

Which of the following organisms are MOST important in biodegradation?

Which of the following gases does NOT contribute to the greenhouse effect?

Replanting trees on a bare hillside is an example of

conservation and afforestation

preservation and conservation

restoration and preservation

reafforestation and restoration

Which of the following factors contribute to INCREASED population size? I. Ability to resist disease II. Inadequate water supplies III. Too much or too little light IV. Small number of predators

When compared to a cheek cell, a muscle cell contains more

Items 10-11 refer to the following diagram of a plant cell.

Which of the labelled structures is responsible for controlling cellular activities?

Which of the labelled structures is NOT found in an animal cell?

By which two processes do the dissolved minerals from the soil move into the roots of a plant?

Osmosis and diffusion

Active transport and osmosis

Diffusion and active transport

Transpiration pull and osmosis

Autotrophic nutrition does NOT occur in

If the bubbles given off by the plants were collected and tested, the gas present would MOST likely be

The intense yellowing of leaves is MOST likely due to a deficiency of

The samples X, Y and Z respectively MOST likely contain

non-reducing sugar / starch / protein

protein / reducing sugar / starch

starch / protein / reducing sugar

protein / starch / non-reducing sugar

Excess amino acids in the diet are

passed out in the faeces

converted to fat and stored

converted to urea in the liver, then excreted

taken directly to the bladder for excretion in urine

Which two vitamins are MOST likely lacking in his diet?

The surface area of the lungs is greatly increased by the

double membranes of the pleura

large numbers of alveoli

dense network of capillaries

branching of the bronchioles

Which of the following is an effect of nicotine found in cigarette smoke?

Increased heart rate

Increased beating of cilia

Reduced oxygen transport by the blood

Increased mucus production in the cells lining the respiratory passage

Which of the following correctly identifies the blood vessels?

Vein / Capilliary / Artery

Artery / Vein / Capilliary

Capilliary / Artery / Vein

Artery / Capilliary / Vein

Which of the following components of blood could surround and engulf pathogens?

Which of the following are involved in the formation of blood clots?

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 statements is NOT true of the xylem of a flowering plant?

It contains mitochondria.

It has lignified walls for support.

It transports water and mineral salts.

Which of the following are reasons why transpiration is important to plants?

I. Water and dissolved minerals are transported to the leaves. II. The leaves are cooled. III. Unwanted water is excreted from the leaves.

The part labelled X is the

Food is stored in the bulb of an onion plant to

provide food for humans

provide for the growth of new plants from the buds

prevent the plant from having to photosynthesize continuously

provide food for developing embryos in the next growing season

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

Gases diffusing through stomata

Tannins being stored in dead tissue

Water vapour diffusing through epidermis

Stored calcium oxalate crystals in leaves during leaf fall

Although glucose is found in the blood plasma, it does not appear in the urine because of

selective reabsorption

Which of the following correctly describes movement in plants?

Irreversible, whole movement

Reversible, whole movement

Irreversible, growth movement

Reversible, growth movement

Which of the following advantages does the ability to move about give to the chicks compared to the seedlings?

After a few days the TALLEST shoot would MOST likely be

Item 34 refers to the following diagram.

Biceps muscle I III Skin of hand II

The numbered structures are

receptor / effector / relay neurone

receptor / relay / effector neurone

effector / relay / receptor neurone

effector / receptor / relay neurone

The vital centres for the control of heartbeat and respiration are located in the

cerebral hemispheres

Which of the following is a long-term effect of alcohol abuse?

Cirrhosis of the liver

Dilation of blood vessels

Myrie is reading a book. When she looks out of the window to focus on a tree, the lens in her eye becomes

Which structure is NOT involved in temperature regulation?

Item 39 refers to the following diagram of a seed.

The part labelled I represents the

position of the radical

Item 40 refers to the following graph which shows changes in dry mass of embryo and endosperm during germination.

From the graph, it is true to say that

the embryo begins to grow as the endosperm increases in mass

the embryo and the endosperm decrease in mass at the same rate

the embryo and the endosperm increase in mass at the same rate

as the embryo grows, the food reserves are gradually depleted

Items 41-42 refer to the following diagrams which represent events involved in reproduction in a flowering plant and an amoeba. Flowering plant Stamen Pistil Amoeba X

Which of the following statements is true for BOTH methods of reproduction?

Cells divide by mitosis.

Offspring are identical to each other.

Cells divide by both mitosis and meiosis.

Both male and female parts are required for reproduction.

The event taking place at X is

Item 43 refers to the following diagram which shows the relationship between the blood of a foetus and the blood of a mother.

Which substances should NOT move in the direction shown by the arrows labelled X and Y?

Antibodies and calcium

Amino acids and glucose

Progesterone and fibrinogen

A method of contraception that protects against both disease and pregnancy is

an intrauterine device

Fertilization normally occurs in the

In which of the following is each fruit or seed matched with its correct method of dispersal?

Animal / Wind / Mechanical / Man

Mechanical / Man / Wind / Animal

Water / Mechanical / Wind / Man

Wind / Mechanical / Animal / Man

Items 47-48 refer to the following organisms. (A) Host (B) Vector (C) Parasite (D) Pathogen

In answering Items 47-48, match the following descriptions to one of the options above. Each option may be used once, more than once or not at all.

An organism which causes a disease

An animal which carries a disease-causing organism but is not adversely affected by it.

Which of the following methods would be MOST appropriate for the treatment of chronic hypertension? I. Diet modification II. Exercise III. Vaccination

A species consists of members that

occupy the same habitat

reproduce by asexual means

interbreed under natural conditions

interbreed to produce infertile offspring

On a certain Caribbean island where sugar cane is grown, a fungus is accidentally introduced into the island and it destroys the entire crop of sugar cane. Which of the following BEST describes what happened?

The plants were old and therefore more susceptible to the fungus.

The plants were not of a hardy enough variety to withstand the fungus.

The plants were planted too close together so the fungus spread easily.

There was no genetic variation among the plants so none could survive the attack.

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

Which of the following processes will result in genetically identical offspring?

Item 54 refers to the following diagram which represents a cross between two plants, heterozygous for a particular characteristic.

Male	r	I
Female
R
r	II	III

Which of the following completes the diagram at I, II and III?

Which of the following terms refers to visible characteristics of living things?

Haemophilia is a sex-linked trait caused by a recessive allele. Which of the following are reasons why the disease is expressed in more men than women?

I. It is caused by a recessive allele carried on the X chromosome. II. There is only one X chromosome in males. III. Women have two X chromosomes so that the recessive allele can be masked by the dominant allele.

Natural selection can be defined as the process by which natural populations

mutate in order to survive

remain well adapted to their habitat

compete with other populations for survival

gradually bring about changes in their habitat

Which of the following is true about the process of artificial selection?

Tissue culture is used to obtain clones.

Traits which benefit the target organism are selected.

Selected traits may not benefit the target organism.

A single beneficial gene is introduced into the cell of the organism.

Which of the following have contributed to the many antibiotic resistant strains of bacteria present today? I. It is possible for bacteria to mutate to antibiotic resistant forms. II. Exposure to an antibiotic causes some bacteria to mutate. III. The mutants reproduce forming a new strain of resistant bacteria.

Which of the following would be involved in the production of insulin by genetic engineering? I. Transfer of the human insulin gene to a bacterium II. A vector to transfer the insulin gene III. Production of insulin by the bacterium

CSEC Biology Paper 1 May/June 2015 - Free CXC Past Paper with Answers

CSEC Biology Paper 1 May/June 2015 Questions