4.
Which of the following leaves does NOT have a net venation?
- (A)
- (B)
- (C)
- (D)
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CSEC Biology Paper 1 May/June 2013 - Free CXC Past Paper with Answers
Free CXC Biology Paper 1 May/June 2013 past paper from 2013. 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 organisms occupies the fourth trophic level in the food chain below?
Cabbage → Caterpillar → Small bird → Hawk
Hawk
Cabbage
Small bird
Caterpillar
Which of the following describes the relationship which involves two species such that one partner benefits while the other, though not benefiting, is unharmed?
Mutualism
Parasitism
Commensalism
Predator/Prey
If all the trees in a large area of a forest were 'wiped out' by disease, what would be the MOST likely effect on the composition of the air?
There would be more oxygen.
The level of carbon dioxide would decrease.
There would be no change in the composition of the air.
The level of carbon dioxide would increase.
Which of the following leaves does NOT have a net venation?
A herbivore, carnivore and omnivore respectively are
goat, lizard, man
grass, grasshopper, lizard
caterpillar, hummingbird, goat
Lignum vitae, grasshopper, chicken
The variation in cellular structure found in any complex organism is due to a process called
growth
elaboration
metabolism
specialization
Which of the following statements is NOT true about osmosis and diffusion?
Osmosis occurs only in living cells.
Both processes require energy to move particles across a concentration gradient.
Osmosis requires a partially permeable membrane.
With both processes, molecules move from an area of high concentration to an area of lower concentration.
When compared to a cheek cell, a muscle cell contains more
vacuoles
ribosomes
mitochondria
chromosomes
Autotrophic nutrition does NOT occur in
moss
zooplankton
tomato plants
blue-green algae
The following chemical equation is incomplete for photosynthesis. X + 6H₂O → C₆H₁₂O₆ + Y Which of the combinations shown below would accurately complete the equation?
X: 6O₂ Y: 6CO₂
X: 6CO₂ Y: 6O₂
X: O₂ Y: CO₂
X: CO₂ Y: O₂
Based on the experiment, which of the following factors are necessary for photosynthesis?
Chlorophyll and oxygen
Light and carbon dioxide
Light and and chlorophyll
Chlorophyll and carbon dioxide
Which of the following structures found in the leaves of a flowering plant contain chloroplasts?
I. Mesophyll layer II. Epidermis III. Guard cells IV. Vein
I and II only
I and III only
II and III only
II and IV only
Item 13 refers to the following information.
A man has poor night vision and his gums bleed whenever he brushes his teeth.
Which two vitamins are MOST likely lacking in his diet?
A and B₁
B₁ and B₂
C and A
C and B₂
The part of the gut into which bile empties is the
ileum
caecum
stomach
duodenum
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
Item 16 refers to the following characteristics.
I. Thin-walled surfaces II. Excellent blood supply III. Always moist IV. Large surface area
These characteristics describe structures that are MOST likely to be associated with the
diffusion of gases
production of energy
movement of water
transport of digested food
Item 17 refers to the following apparatus set up to test for products of aerobic respiration.
The solution in Jar Z should be
iodine
tap water
calcium hydroxide (lime water)
sodium hydroxide (caustic soda)
The right ventricle of the heart collects blood from the
aorta
vena cava
right atrium
pulmonary artery
Which of the following sets of characteristics is true for white blood cells?
✓ / ✓ / ✓
✓ / ✓ / X
X / X / ✓
✓ / X / ✓
Item 20 refers to the following diagram which shows cells from the stem of a plant.
The part labelled X is the
cork cell
cambial cell
cortical cell
companion cell
Under which of the following conditions will the rate of transpiration in Impatiens plants be HIGHEST?
Sunny and low wind speed
Sunny and high wind speed
Cloudy and low wind speed
Cloudy and high wind speed
Which of the following organisms has the LEAST need for a transport system?
Amoeba
Tadpole
Seedling
Honeybee
Which of the following storage organs characterizes the Irish potato?
Bulb
Corm
Root tuber
Stem tuber
Excretion is important in living organisms because metabolic waste products
cannot be stored
decay very readily
are very soluble substances
can poison living organisms
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
The glomerular filtrate in I contains
salts, water, urea, glucose
glucose, salts, urine, water
plasma proteins, water, urea, urine
urine, plasma proteins, glucose, urea
The MAIN function of cartilage at the end of long bones is to
protect nerves
reduce friction
lubricate joints
increase flexibility
Which of the following correctly describes movement in plants?
Irreversible, whole movement
Reversible, whole movement
Irreversible, growth movement
Reversible, growth movement
Nervous tissue is found at
I
II
III
IV
At what point is vision NOT possible?
I
II
III
IV
Item 31 refers to the following diagrams of germinating seedlings treated as shown.
I II III IV Light
At the end of one week, which seedlings would bend towards the light?
I and IV only
II and III only
I, II and III only
II, III and IV only
Item 32 refers to the following diagram.
Biceps muscle Skin of hand I II III
The numbered structures are
receptor / effector / relay neurone
receptor / relay neurone / effector
effector / relay neurone / receptor
effector / receptor / relay neurone
Which of the following are MOST likely to cause improper functioning of the eye? I. Weak ciliary muscles II. Lack of Vitamin A III. Haemophilia
I and II only
I and III only
II and III only
I, II, and III
Which of the following endocrine glands is found in the brain?
Thyroid
Adrenal
Thymus
Pituitary
Item 35 refers to the following diagram of a vertical section through human skin.
I II III IV V VI
Which structure(s) above will be involved in temperature regulation if there is a DECREASE in external temperature?
I only
I and IV only
I, II and III only
IV, V and VI only
A method of contraception that protects against both disease and pregnancy is the use of
the pill
a condom
spermicide
an intrauterine device
The endocrine gland located in the neck produces the hormone
insulin
glucagon
adrenaline
thyroxine
Which of the following is NOT a benefit of asexual reproduction in plants?
A wide variety of the offspring
Many new plants in a short time
Many plants with desirable features
New plants which are identical to each other
Items 39-40 refer to the following diagram of the female reproductive system.
In answering items 39-40, match each item with one of the options above. Each option may be used once, more than once or not at all.
The structure where the egg is fertilized
(A)
(B)
(C)
(D)
The structure where the ova are produced
A wide variety of the offspring
Many new plants in a short time
Many plants with desirable features
New plants which are identical to each other
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 plant may have been self-pollinated.
The seeds had been formed asexually after fertilization.
The same pollen grain had been responsible for fertilization of the seeds.
The plant from which the seeds came became vegetatively propagated.
Which of the following fruits is dispersed by animals?
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.
I and III only
I and IV only
II and III only
II and IV only
Which of the following statements about meiosis is NOT true?
Recombination of genes occurs.
Produces four daughter cells.
Occurs only in the sex organs.
Chromosome number is maintained.
An example of discontinuous variation is
intelligence
leaf size
eye colour
presence of horns in cattle
Which of the following terms refers to visible characteristics of living things?
Gene
Phenotype
Genotype
Chromosome
In guinea pigs, rough coat is dominant to smooth coat. If two heterozygous rough-coat guinea pigs mated, they would MOST likely produce
rough-coat offspring only
smooth-coat offspring only
an equal number of rough-coat and smooth-coat offspring
more rough-coat offspring than smooth-coat offspring
Human beings have been able to develop many species of plants and animals with beneficial characteristics. This process is called
artificial selection
natural selection
fertilization
genetics
In which of the following parts of a plant does the process of mitosis occur?
Phloem
Xylem
The region behind the root tip
The region behind the root hair
Items 50-51 refer to the following.
(A) Host (B) Vector (C) Parasite (D) Pathogen
In answering items 50-51, match the following statements 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
Host
Vector
Parasite
Pathogen
An animal which carries a disease-causing organism but is not adversely affected by it
Host
Vector
Parasite
Pathogen
Which of the following are involved in the formation of blood clots?
Platelets
Antibodies
Phagocytes
Lymphocytes
Which of the following methods may help to reduce the spread of diseases caused by insect vectors?
I. Sterilization II. Use of insecticides III. Use of disinfectants
I only
II only
I and II only
I, II and III
It is believed that AIDS is NOT transmitted
from mother to foetus through the placenta
by sharing food with an infected person
by using contaminated needles
by sexual intercourse
You can reduce your likelihood of getting a non-communicable disease by changing risk factors that relate to your
age
heredity
lifestyle
body type
Which of the following provides the BEST example of 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 about inorganic fertilizers?
They do not affect soil pH.
They help to hold water in the soil.
They make nutrients available more quickly.
They improve the crumb structure of soil.
Items 58-59 refer to the following graphs which show the growth pattern of several populations.
(A) Size of population (B) Size of population (C) Size of population (D) Size of population Time Time Time Time
In answering items 58-59, match the following statements about the population, to one of the options above. Each option may be used once, more than once or not at all.
Has a good food supply and is NOT subject to environmental stress
Graph (A)
Graph (B)
Graph (C)
Graph (D)
Has reached its equilibrium and there is a delicate balance between the rate of birth and the rate of death
Graph (A)
Graph (B)
Graph (C)
Graph (D)
Which of the following organisms are MOST important in biodegradation?
Bacteria
Vultures
Omnivores
Earthworms