Item 3 refers to the following diagram.
3.
The omnivores are the
- (A)
doves
- (B)
egrets
- (C)
slugs
- (D)
hawks
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CSEC Biology Paper 1 May/June 2002 - Free CXC Past Paper with Answers
Free CXC Biology Paper 1 May/June 2002 past paper from 2002. Includes a worked answer key. Open the PDF, take a timed test, and study with AI on Caribbean AI.
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The relationship between which of the following pairs of organisms provides an example of mutualism?
Man and mosquito
Hen and chick
Dog and flea
Cattle and egret
Which of the following is the correct sequence of feeding relationships in a food chain?
Herbivore → producer → carnivore → decomposer
Producer → herbivore → carnivore → top carnivore
Top carnivore → carnivore → herbivore → producer
Producer → carnivore → herbivore → scavenger
Item 3 refers to the following diagram.
The omnivores are the
doves
egrets
slugs
hawks
If all the trees in a large area of forest were wiped out by disease, what would be the MOST likely effect on the composition of the air in the long term?
The level of carbon dioxide would increase because of the rotting vegetation.
The level of carbon dioxide would increase because of the absence of photosynthesis.
There would be no change in the composition of the air because the trees are not there to add or take away carbon dioxide.
There would be less oxygen since there are no plants to use it up.
Which of the following statements about a food chain is true?
Energy from the sun is transferred from one organism to subsequent organisms.
Each of its members depends on heat energy obtained directly from the sun.
Energy changes from one type to another, that is, from heat to light to chemical
The sun traps light energy at the start of the food chain.
Which of the following is NOT true about decomposers?
They release nutrients for recycling.
They prevent the accumulation of dead organic matter.
They are more abundant in damp places.
They are favoured by low tempera- tures.
In which of the following parts of the alimentary canal is starch MAINLY digested?
I. Mouth II. Stomach III. Small intestine IV. Large intestine
III only
I and II only
III and IV only
II, III and IV only
After walking one mile in warm weather and then going into an airconditioned room for half an hour, which of the following changes would take place in the skin?
Vasodilation and increase in heat loss
Vasoconstriction and increase in sweating
Vasoconstriction and no sweating
Vasodilation and decrease in heat loss
Bile empties into the
duodenum
caecum
ileum
stomach
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 fertilization of the seeds.
The plant may have been self-pollinated
Items 11 and 12 refer to the following diagram of the human female reproductive system, with structures labelled (A) - (D).
When you are answering Items 11 and 12, a particular choice from the above may be made more than once, once or not at all.
Where does development of the ovum occur?
A only
B only
C only
D only
Where is fertilization MOST likely to occur?
A only
B only
C only
D only
West Indian cherries (fruits) are rich in Vitamin C. Which of the following BEST describes the benefit(s) a boy derives from consuming West Indian cherries everyday?
I. Increase in the absorption of iron II. Prevention of bleeding gums and joints III. Increase in the absorption of calcium
I only
I and II only
I and III only
I, II and III
Which of the following parts of the urinary tubule is NOT closely associated with a rich supply of blood vessels?
Henle's Loop
Collecting tubule
Convoluted tubule
Bowman's capsule
An individual wears glasses (spectacles) with convex lenses because
his eyeballs are of irregular shape
his lenses are becoming cloudy
images form behind the retina
insufficient light is entering his pupils
Plant cells differ from animal cells in their ability to
control the intake of ions
control the outflow of ions
resist tugor pressure
resist plasmolysis
Which of the following is NOT normally a function of leaf epidermal cells?
Excretion
Transpiration
Photosynthesis
Respiration
Which of the following fruits is likely to be dispersed by animals?
The increase in temperature in the vessel is BEST explained by the fact that the seeds are.
numerous
placed close together
taking in water
using their food stores
Which of the following is NOT excreted by mammals?
Urea
Sodium chloride
Calcium oxalate
Water
Which of the following is NOT carried out by the liver?
Storage of calcium
Storage of water-soluble vitamins
Production of urea
Production of heat
The structures which serve largely for muscle attachment are
I and II only
II and IV only
I, II and III only
III and IV only
Nervous tissue is found at
I
II
III
IV
Which of the following triggers the formation of blood clots?
Thrombocyte
Erythrocyte
Lymphocyte
Phagocyte
The following diagram shows the parts of a flower. In which labelled part are gametes produced?
(A)
(B)
(C)
(D)
In the above graph, which of the following is likely to have contributed MOST to the decrease in dry weight between stages I and II?
Photosynthesis
Transpiration
Translocation
Respiration
Insulin (a protein) is never taken orally because it
is broken down by pepsin
inhibits the action of salivary amylase
is inactivated by bile salts
takes too long to be absorbed into the blood
The following statements were made to show that leaves are well suited for photosynthesis. Which of the following are true?
I and II only
III and IV only
II, III and IV only
I, II, III and IV
Plants need magnesium for the formation of
cell walls
chloroplasts
protein
starch
If the pancreas were damaged, which of the following activities would be affected?
Production of bile
Absorption of proteins
Digestion of proteins
Secretion of gastric juice
When a seedling loses water to the atmosphere faster than it can be obtained from the soil, the turgor pressure
decreases and the seedling wilts
decreases and the seedling does not wilt
increases and the seedling wilts
increases and the seedling does not wilt
Which of the following processes that occur in mammals ensures that digested food is made available to body tissues?
Osmoregulation
Excretion
Diffusion
Evaporation
The following table shows the results, recorded after 20 minutes, of tests done with cobalt chloride paper on two leaves from different plants.
From the results, one may conclude that
Leaf X has a faster rate of transpiration than leaf Y
Leaf Y has a faster rate of transpiration 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
Which of the following BEST account for the fact that one usually gets tired during heavy exercise?
I. Energy is not easily liberated from mitochondria during heavy exercise. II. Oxygen cannot reach the muscle mitochondria fast enough. III. The level of lactic acid in the blood is lowered. IV. The level of lactic acid in the blood is increased.
I and II only
I and III only
II and III only
II and IV only
In the diagrams above, the stem at Q is turned upward because
auxins accumulated on the lower side of the shoot
the tip can only grow if it is pointing upward
auxins accumulated on the upper side of the shoot
it was attracted to light
Which of the following arrangements of cells indicate the concentrations of the solutions in ascending order (from weakest to most concentrated)?
I, II, III, IV
II, III, IV, I
III, IV, II, I
IV, III, I, II
The presence of a long corolla tube is an indication that the flower is pollinated by
wind
a heavy insect
an organism that is attracted to sugary secretions
an organism with a long mouth part
Which of the following are necessary for germination to take place? I. Air II. Food supply III. Light IV. Moisture
I and II only
III and IV only
I, II and IV only
II, III and IV only
responds to a nervous impulse.
(A)
(B)
(C)
(D)
is activated by a stimulus
(A)
(B)
(C)
(D)
The following are changes which take place in the thorax during ventilation of the lungs. I. Decrease in pressure II. Increase in pressure III. Decrease in volume IV. Increase in volume
Which two of these changes occur during inspiration?
I and III
I and IV
II and III
II and IV
Structures that carry the code for the same genetic characteristic (e.g. eye colour) are called
alleles
genes
chromatids
chromosomes
Four children born to the same parents have blood groups A, B, AB and O. Which of the following represents the genotypes of the parents?
AO x BO
AB x OO
AA x BO
AO x BB
Which of the following is NOT a method of natural selection?
Mutation
Migration
Variation
Grafting
A female carrying the trait for colour blindness marries a normal male. What are the chances of her producing a normal female child without this trait?
25%
50%
75%
100%
Offspring which are NOT identical to the parent are produced by
binary fission
vegetative propagation
sporulation
sexual reproduction
As a result of mitosis each daughter cell has
half the number of chromosomes as the parent
the same number of chromosomes as the parent
twice the number of chromosomes as the parent
a variable number of chromosomes
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
Through which of the following can natural immunity be obtained? I. Blood transfusion II. Breast milk III. The placenta IV. Vaccines
I and II only
II and III only
I and IV only
III and IV only
demonstrates incomplete dominance?
Pattern (A)
Pattern (B)
Pattern (C)
Pattern (D)
will produce a 1:2:1 ratio of phenotypes?
Pattern (A)
Pattern (B)
Pattern (C)
Pattern (D)
An organism which causes a disease is called a
pathogen
host
parasite
vector
Items 53-54 refer to the following diagram of a Tullgren funnel which is used for collecting small soil animals. Light bulb Funnel Soil sample Alcohol
The purpose of the light bulb is to
enable the investigator to see the small organisms
provide warmth for the soil organ- isms
drive animals to the base of the funnel
keep the alcohol at a constant tem- perature
Which of the following explains why the apparatus works well? I. Soil organisms show a positive re- sponse to gravity. II. Soil organisms show a negative response to light. III. Soil organisms are killed by alco- hol. IV. Soil organisms move away from dry areas.
I and II only
III and IV only
I, II and III only
II, III and IV only
Item 55 relates to the following graphs which show the growth pattern of several populations. Size of population (A) Time Size of population (B) Time Size of population (C) Time Size of population (D) Time
Which of the populations above has a good food supply and is subject to little environ- mental stress?
Item 56 refers to the following methods of disease treatment/control. I. Improved personal hygiene II. Isolation of persons with the disease III. Good sanitary practices e.g. proper garbage disposal IV. Careful food preparation
These methods are used in the treatment/ control of a disease that is
inherited
infectious
caused by inadequate supply of nutrients
caused by malfunction of body systems
The table shows the results of analysing a soil sample.
The farmer from whose field the sample was taken would BEST be advised to (A) plant a crop which requires a lot of water (B) abandon the field altogether (C) grow plants which prefer well-drained soil (D) turn the field into a cow pasture
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
Which of the following is NOT a cause of soil erosion?
Contour ploughing
Overgrazing
Burning of under growth
Deforestation
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.
Two soil components that are derived from the parent rock material are
humus and mineral salts
sand and humus
sand and mineral salts
clay and micro organisms