12.
Sodium hydroxide and weak copper sulphate solution will produce a violet colour with a
- (A)
fat
- (B)
starch
- (C)
sugar
- (D)
protein
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CSEC Biology Paper 1 May/June 2003 - Free CXC Past Paper with Answers
Free CXC Biology Paper 1 May/June 2003 past paper from 2003. Includes a worked answer key. Open the PDF, take a timed test, and study with AI on Caribbean AI.
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Which of the following is a characteristic of a prokaryotic cell?
Presence of a nucleus
Presence of membrane-bound organelles
Presence of circular DNA
Presence of a cell wall made of cellulose
The diagram below shows a plant cell. Which labelled part is responsible for photosynthesis?
P
Q
R
S
Which of the following is the correct sequence of events in mitosis?
Prophase, Metaphase, Anaphase, Telophase
Metaphase, Prophase, Anaphase, Telophase
Anaphase, Telophase, Prophase, Metaphase
Telophase, Anaphase, Metaphase, Prophase
The process by which water moves across a semi-permeable membrane from a region of higher water concentration to a region of lower water concentration is called
Active transport
Diffusion
Osmosis
Facilitated diffusion
Which of the following enzymes is responsible for the breakdown of starch into maltose?
Lipase
Protease
Amylase
Sucrase
The diagram below shows a section of a leaf. Which labelled part is responsible for gas exchange?
P
Q
R
S
Which of the following is a primary producer in an ecosystem?
Lion
Grass
Rabbit
Fungus
The process of nitrogen fixation is carried out by
Plants
Animals
Bacteria
Fungi
Which of the following statements are true of chloroplasts? I. They contain chlorophyll. II. They absorb light energy. III. They are a site for the manufacture of complex substances. IV. They are usually found in the leaves of green plants.
I and II only
II and III only
I, II and IV only
I, II, III and IV
Which two vitamins are probably lacking from his diet?
A and B,
B, and B,
C and A
G and B,
He could improve his health by eating more
carrots and oranges
milk and fish
brown rice and carrots
fish liver oil and eggs
Sodium hydroxide and weak copper sulphate solution will produce a violet colour with a
fat
starch
sugar
protein
A drop of blood was added to 10 cm³ of a colourless liquid in a boiling tube. Bubbles of a gas, which relighted a glowing splint, were given off. The liquid in the tube was likely to be a solution of
hydrogen chloride
hydrogen peroxide
sodium hydrogen carbonate
sodium chloride
Which of the following graphs BEST illustrate the effect of increasing temperature on the rate of enzyme reaction?
Item 15 refers to the following diagram which shows the position of some of the endocrine glands in man.
The gland which controls TWO of the others is
I
. II
III
IV
Which of the following substances supplies MOST energy per gram?
Glucose
Starch
Protein
Fat
On what type of day is the rate of transpiration likely to be lowest?
Cool and sunny
Cloudy and windy
Hot and windy
Cloudy and cool
Which of the following diagrams shows the correct arrangement of the apparatus for comparing the composition of exhaled and inhaled air?
leaf X has a taster rate of transpiration than leaf Y
leaf X has a taster rate of transpira- tion than leaf Y
leaf Y has a faster rate of transpira- tion than leaf X
leaf X has more stomata on surface 2 than leaf Y
leaf Y has more stomata on surface 1 than leaf X
The substances that react with each other in aerobic respiration are
water and carbon dioxide
water and oxygen
glucose and oxygen
glucose and carbon dioxide
The alveoli of the lungs of a mammal
keep the lungs filled to capacity with air at all times
serve to increase the absorptive surface of the lungs
are filled with oxygen to keep the lungs in an expanded state
prevent the lungs from collapsing
Which of the following processes accounts for the movement of oxygen across a respiratory surface?
Diffusion
Absorption
Inhalation
Osmosis
Item 23 refers to the following diagram.
In a patient with a certain defective heart condition it was found that blood flowed from Point I to Point II in the diagram above. This was MOST likely due to malfunction of the
left atrium
left ventricles
semi-lunar valve
bicuspid valve
The formation of a blood clot is a function of
erythrocytes
leucocytes
platelets
plasma
Mineral salts in plants are MAINLY transported through the
sieve tubes
cambium
parenchyma
xylem vessels
Which of the following would NOT represent a form of excretion in plants?
Gases diffusing through stomata
Substances being stored in the bark of a tree
Water vapour diffusing through epidermis
Stored calcium oxalate crystals in leaves during leaf fall
Which of the following is NOT an excretory product in man?
Urea
Sodium chloride
Calcium oxalate
Water
In which of the following situations would secretions from your adrenal glands help you to function more effectively?
Doing an examination
Eating a meal
Listening to music
Going to bed
Item 29 refers to the following diagrams of germinating oat grains which were treated as shown. The investigation was left for one week. Tips cut off and replaced on plastic Tips strip cut off Tips covered with Aluminium foil Untreated ← Light I II III IV
At the end of the week, which seedlings would you expect to be growing straight?
I and IV only
II and III only
I, II and III only
II, III and IV only
Bones do NOT
produce red blood cells
support the body
act as lever systems in the body
produce sodium ions
The primary function of the neural spine of the lumbar vertebra is for
attachment of muscles
support of adjacent vertebrae
protection of the spinal cord
movement of bones
Which of the following is a function of liga- ments?
Preventing friction
Holding bones together
Attaching muscles to bones
Helping to lubricate joints
Internal reflection or scattering of light within the eye is prevented by the
lens
retina
choroid layer
sclerotic layer
If an object is thrown towards you, your eyes blink. The receptors and effectors for this reflex action are the
retina and the eyelid muscles
retina and the ciliary muscles
pupil and the eyelid muscles
pupil and the ciliary muscles
Which of the following is likely to cause the lowering of body temperature?
Dilation of blood vessels just under the skin
Raising of the hairs on the skin
Increase in the metabolic rate
Decrease in the evaporation of sweat
Which of the following statements confirms that the coconut is a fruit?
It can be eaten.
It is dispersed by water.
It has a plumule and a radicle.
It has a three-layered pericarp.
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
cross-pollination
pollination by the wind
self-pollination
easy access by insects
Which of the following shows the route taken by a sperm cell for fertilisation to take place?
Sperm duct → urethra → uterus → fallopian tube
Sperm duct → urethra → fallopian tube → uterus
Urethra → sperm duct → fallopian ' tube → uterus
Urethra → sperm duct → uterus → fallopian tube
Items 39-40 refer to the following diagram. IV Skin of hand -Biceps muscle I II III
When the skin of the hand touches a hot object, the sequence of impulse flow is
I → II → III
II → III → I
II → I → III
I → III → II
The structures numbered III, IV and V in the diagram above are
receptor effector relay neurone
receptor relay neurone effector
relay neurone effector receptor
relay neurone receptor effector
Items 41-42 refer to the following diagrams.
Figure X could be used to show
stages in the life history of an insect
the heights of students in a school
the number of shrubs in a field
variation in skin colour among albinos
Figures X and Y can both be used to show different examples of
variation
reproduction
selection
cell division
In which of the following does meiosis occur?
A developing embryo
The skin of a mammal
The testis of a mammal
The tip of the shoot of a plant
Between the ages of 3 and 5, boys and girls show a reduction in their growth rate because
they do not eat a lot of protein
they are suffering from worms
their body cells divide by reduction division
the rate of division of the body cells is slower
Which of the following combinations of sex chromosomes is found in the nuclei of non-reproductive human cells?
In the male XY / In the female YY
In the male XX / In the female XY
In the male YY / In the female XY
In the male XY / In the female XX
A cross between red and white flowered plants of the same species produced plants with pink flowers.
What would be the expected phenotypic ratio of the F₂ generation if selfing took place?
1 red: 1 white
1 red: 1 pink: 1 white
1 red: 3 pink: 1 white
1 red: 2 pink: 1 white
If one of the pink flowered plants were crossed with the red parent, what percentage of the offspring would be expected to have pink flowers?
0
25
50
100
By which of the following may new plant varieties arise? I. Mutations II. Mitosis III. Breeding
I only
II only
I and III only
II and III only
Excessive consumption of alcohol may lead to an increase in size, and damage to, the tissues of
I
II
III
IV
Which of the following does NOT provide a form of immunisation?
Inoculation with a mild form of the disease
Inoculation with antibodies
Isolation of the infected person
Breast-feeding of the infant
Which of the following is true of antigens?
They are produced by white blood cells.
They cause the production of anti- bodies.
They get rid of antibodies.
They are used to treat diseases.
The rapid spread of a disease through a population is likely to occur if the disease is
inherited
caused by poor diet
transmitted by a pathogen
caused by malfunction of body systems
Which of the following has NOT contributed to the marked increase in man's life expectancy over the last 100 years?
Gene mutations
Better medical care
Improved sanitation
Increased information about disease
After several weeks of heavy rains a sandy soil may
lack oxygen
lack mineral salts
become waterlogged
become more fertile
Soil fertility may BEST be increased in the short term by the
rotation of crops
addition of manure
addition of lime
terracing of land
Which of the following situations BEST exemplifies an ecological community?
The organisms in a fresh water pond
A flock of migrating birds
Flies on a piece of rotting meat
A colony of termites
On a field trip at the seaside, your group collected several specimens of sea urchins. After these have been sorted, counted and classified, what would you suggest is the MOST appropriate course of action?
Kill them.
Return them alive to their habitat.
Preserve all in formalin.
Place in plastic bags and display them in the laboratory.
An open field was investigated using metre quadrats. In 5 random throws, species A occurred as shown in the table below. This data can be used to determine
cover only
cover and density
frequency and cover
density and frequency
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?
Use a line transect.
Collect as many species as possible.
Use large quadrats.
Take a complete census of the area.
The farmer from whose field the sample was taken would BEST be advised to
plant a crop which requires a lot of water
abandon the field altogether
grow plants which prefer well drained soil
turn the field into a cow pasture