CSEC Biology Paper 1 May/June 2011 - Free CXC Past Paper with Answers

The organism to which the LEAST amount of energy is available is the

Which characteristics could be used to divide the animals into two groups?

Which of the following pairs of organisms is at the same trophic level?

When does respiration occur in plants?

When photosynthesis stops

Only while photosynthesis is taking place

What are the processes taking place at I and II?

Respiration / Combustion

Photosynthesis / Combustion

Respiration / Photosynthesis

Decomposition / Photosynthesis

The variation in cellular structure found in any complex organism is due to a process called

Which of the following pairs of function and organelle is NOT correctly matched?

Osmotic control / Membrane

Protein synthesis / Chloroplast

Hereditary materials / Nucleus

Release of energy / Mitochondrion

Energy is released from sugar during

Which of the following is NOT true of the cells labelled I and II in the diagram above?

I makes most of the food.

I has a relatively larger surface area.

II receives less energy from the sun.

II possesses more chloroplasts than I.

Plant cells differ from animal cells in their ability to

control the intake of ions

control the outflow of ions

resist tugor pressure

Item 11 refers to the apparatus below which was set up in a school yard on a sunny day.

After 20 minutes, movement of water should have occurred in the direction(s) of

Which of the following structures found in the leaves of a flowering plant contain chloroplasts? I. Epidermis II. Mesophyll layer III. Guard cells IV. Vein

Which of the following teeth would be MOST suitable for peeling cane or removing tough meat from a bone?

The part of the gut into which bile empties is the

West Indian cherries are rich in Vitamin C. Which of the following BEST describe(s) the benefit a boy derives from consuming West Indian cherries (fruit) everyday? I. Increase in the absorption of iron II. Prevention of bleeding gums III. Increase in the absorption of calcium

Which of the following options is true for aerobic and anaerobic respiration?

Does not use O,. Uses O, .

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.

Item 17 refers to the following apparatus set up to test for products of aerobic respiration.

The solution in Jar Z should be

calcium hydroxide (lime water)

sodium hydroxide (caustic soda)

The energy released in respiration is temporarily captured in

adenosine diphosphate (ADP)

adenosine triphosphate (ATP)

Items 19-20 refer to the following diagram of the human respiratory system.

The site of gaseous exchange is

The volume of air within the lungs is controlled by

As part of the sequence of the heartbeat, the ventricular muscle contracts, the atrio-ventricular valves close, and the arterial valves open. This allows blood to flow from

atria to the ventricles

ventricles to the veins

ventricles to the arteries

Which of the following organisms has the LEAST need for a transport system?

Human red blood cells are normally

spherical, with a nucleus

spherical, without a nucleus

disc-shaped, with a nucleus

disc-shaped, without a nucleus

A whole plant has its roots submerged for a few hours in water coloured with red ink. In which part of its leaves does the ink FIRST show up?

Which of the following conditions INCREASES the rate of transpiration?

Item 26 refers to the following sections of phloem tissues from a plant stem.

Companion cells are represented by

Mineral salts are transported in plants MAINLY through the

Items 28-29 refer to the following simplified drawing of a renal tubule (nephron).

The concentration of urea at S is about 60 times its concentration at R because

large quantities of urea are excreted from the body

urea passes into the tubule at various points along its length

most of the fluid in the tubule is reabsorbed before reaching S

at S, urine collects from several smaller collecting ducts

One component present in the fluid in P but not in the fluid in Q is

Excretion is important in living organisms because metabolic waste products

are very soluble substances

can poison living organisms

Which of the following components reduce friction?

The primary function of the neural spine of the lumbar vertebra is for

attachment of muscles

protection of the spinal cord

support of adjacent vertebrae

Which of the following is a function of ligaments?

Holding bones together

Attaching muscles to bones

Helping to lubricate joints

Nervous tissue is found at

For several days, light reaching some seedlings was limited to one side. The seedlings bent towards the light. Which of the following BEST explain(s) this response? I. Uneven growth of the cells at the node of the stem II. Uneven growth of the cells at the region behind the tip of the stem III. Inhibition of the production of auxins on the unlit side

At what point is vision NOT possible?

What causes the appearance in I and II to be different?

In bright and dim light the circular and radial muscles both contract.

In bright and dim light both circular and radial muscles relax.

In dim light the circular muscles relax and radial muscles contract, and in bright light radial muscles relax and circular muscles contract.

In bright light circular muscles relax and radial muscles contract, and in dim light radial muscles relax and circular muscles contract.

Items 38-39 refer to the following diagram.

When the skin of the hand touches a hot object, the sequence of impulse flow is

The numbered structures are

sensory neurone / effector / relay neurone

motor neurone / sensory neurone / relay neurone

effector / relay neurone / receptor

receptor / relay neurone / sensory neurone

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

as the embryo grows, the food reserves are gradually depleted

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

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

the embryo begins to grow as the endosperm increases in mass

Item 41 refers to the following diagram of a vertical section through human skin.

Which structure(s) above will be involved in temperature regulation if there is a DECREASE in external temperature?

Item 42 refers to the following diagram which shows the position of some endocrine glands in humans.

In which of the following glands is follicle-stimulating hormone produced?

Which of the following are true about the production of gametes in humans?

I. Males produce more gametes than females. II. Females produce more gametes than males. III. Males produce gametes for a longer period of their life span than females. IV. Females produce gametes for a longer period of their life span than males.

During pregnancy, the developing foetus receives from its mother protection against infections, a perfectly balanced diet, warmth and oxygen. Which of the following can a mother no longer provide for her new-born infant?

Oral contraceptives prevent pregnancy by

preventing ovulation

destroying released eggs

preventing implantation

You have found a flower which has a long style with a feathery stigma, long filaments, no corolla and very small sepals. This flower is adapted for

I. cross-pollination II. self-pollination III. pollination by the wind IV. easy access by insects

Seeds from the same pod were planted under the same conditions. The plants which grew from them appeared to be very similar. What is the MOST likely explanation for this occurrence?

The seeds had been formed asexually after fertilisation.

The plant from which the seeds came became vegetatively propagated.

The same pollen grain had been responsible for fertilisation of the seeds.

The plant may have been self-pollinated.

Some fowls (called Erminette) have black and white feathers evenly distributed over the body. A breeder crosses two of these fowls and finds that there are pure white, pure black and Erminette among the offspring.

What would be the expected ratio of black:white:Erminette?

In which of the following parts of the plant does the process of mitosis occur?

The region behind the root hair

The region behind the root tip

Item 50 refers to the following diagrams, plotted from data collected on a survey of human characteristics.

X and Y can both be used to show different kinds of

To which of the following groups does a disease caused by a pathogen belong?

Which of the following is NOT one of the body's natural ways of defending itself against infection?

Action of phagocytes

Production of antibodies

Which of the methods listed below could help to reduce the spread of diseases caused by insect vectors?

I. Sterilization II. Use of insecticides III. Use of disinfectants

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 following statements were made by a number of drug users.

I. I drink strong coffee every hour. The caffeine keeps me going. II. I have to inject myself with insulin twice a day. III. I know alcohol is not good for me so I have only three drinks a day. IV. I take antibiotics regularly in case I catch a cold.

Which of these individuals could be considered drug abusers?

Which of the following situations BEST exemplifies an ecological community?

A colony of termites

A flock of migrating birds

Flies on a piece of rotting meat

The organisms in a freshwater pond

Which of the following statements is true of inorganic fertilisers?

They help to hold water in the soil.

They improve the crumb structure of soil.,

They make nutrients available more quickly.

They do not affect soil pH.

Replanting trees on a bare hillside is an example of

conservation and afforestation

preservation and conservation

restoration and preservation

reafforestation and restoration

Item 59 refers to the following table. Number of Throws of a Quadrat

Species	1	2	3	4	5	6	7	8	9	10
P	7	7	14	28	2	1	0	0	4	3
Q	18	21	36	3	10	3	1	5	5	6
R	10	18	46	0	12	10	8	2	16	4
S	1	0	0	0	1	3	4	1	21	2

The area in which the quadrat on the third throw fell is MOST probably

under a large shade tree

far from a source of water

What would be the BEST method of investigating the range of organisms found between the low tide mark and the high tide mark on a sloping, rocky sea shore?

Using a line transect

Using large quadrats

Taking a complete census of the area

Collecting as many species as possible

CSEC Biology Paper 1 May/June 2011 - Free CXC Past Paper with Answers

CSEC Biology Paper 1 May/June 2011 Questions