Free CXC Biology Paper 1 May/June 2014 past paper from 2014. Includes a worked answer key. Open the PDF, take a timed test, and study with AI on Caribbean AI.
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CSEC Biology Paper 1 May/June 2014 - Free CXC Past Paper with Answers
Free CXC Biology Paper 1 May/June 2014 past paper from 2014. Includes a worked answer key. Open the PDF, take a timed test, and study with AI on Caribbean AI.
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Every question from this paper as text. See the answers and worked solutions. Questions are the property of the Caribbean Examinations Council; Caribbean AI is not affiliated with CXC.
A plant which has reduced leaves with no chlorophyll, lacks a proper root system, and flowers abundantly, is MOST likely to be found
in a habitat where water is scarce
living parasitically on another plant
growing in an area where there are few insects
existing as a commensal with other green plants
Item 2 refers to the following food chain which shows the feeding relationships in a freshwater habitat.
Microscopic algae → mosquito larvae → small fish → large fish
The organisms to which the LEAST amount of energy is available is the
microscopic algae
mosquito larvae
small fish
large fish
Item 3 refers to the following list.
I. Number of legs II. Body temperature III. Shape of body IV. Type of body covering
The dead remains of a previously unknown animal are found in a forest. Which of the features listed above could be used to classify the animal?
I and II only
III and IV only
I, III and IV only
II, III and IV only
Which of the following types of bacteria is important for returning nitrogen gas to the atmosphere?
Nitrifying
Denitrifying
Putrefying
Nitrogen-fixing
A mature plant cell is different from a mature animal cell because the plant cell has
mitochondria
a cell membrane
a large permanent vacuole
a nucleus suspended in the cytoplasm
In a comparison between osmosis and diffusion, which of the following statements is NOT true?
Osmosis occurs only in living cells.
Both processes require energy to move particles across a concentration gradient.
Diffusion does not always require a partially permeable membrane.
With both processes, molecules move from a high concentration to an area of lower concentration.
Which of the following organelles is the site of aerobic respiration?
Nucleus
Cytoplasm
Chloroplast
Mitochondrion
Item 8 refers to the following diagram which represents a metabolic process carried out in plants. [Diagram of photosynthesis process]
The food produced is
fat
starch
protein
amino acid
Which of the following is NOT an autotroph?
Fungus
Moss
Fern
Alga
Item 10 refers to the following experiment. A green and white variegated leaf is exposed to sunlight for three hours and then tested for starch. The results of the test are shown in the diagram below. [Diagram showing a variegated leaf before and after starch test]
Based on the experiment, which of the following conditions is necessary for photosynthesis?
Light
Water
Chlorophyll
Carbon dioxide
When enzymes are boiled they are unable to function. This is because an increase in temperature
destroys food materials
increases the rate of enzyme action
denatures the protein of enzymes
converts complex sugars to simple sugars
Which of the following occurs as a result of a deficiency of nitrogen in plants?
Yellowing of the older leaves of the plants
Stunted chlorotic plants with reduced yields
Greater susceptibility to diseases and insect attacks
Dark green overly vigorous foliage leading to reduced yields
Which of the following is a function of hydrochloric acid in the stomach?
Emulsifying fat
Breaking down starch
Hydrolysing complex sugars
Providing a medium for pepsin
The role of respiration is BEST described as the
release of energy
absorption of oxygen
breakdown of carbohydrates
liberation of carbon dioxide
Item 15 refers to the following graph which shows the oxygen uptake of an athlete at rest, during exercise and after a period of exercise (recovery).
The HIGHEST concentration of lactic acid in the athlete's muscles occurs at
I
II
III
IV
Which of the following is NOT a reason for placing green plants in an aquarium?
Providing food for the animals
Providing oxygen for the animals
Removing the chlorine from the water
Removing the animals' waste products
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
The right ventricle collects blood from the
aorta
vena cava
right atrium
pulmonary artery
An Amoeba obtains all the oxygen it needs by diffusion via its cell membrane, while a human needs to have special respiratory surfaces for this purpose. The BEST reason for this difference is that
the Amoeba does not require much oxygen
oxygen cannot pass through the skin of a human
a human requires a larger volume of oxygen
a human's surface area to volume ratio is too small for diffusion to be effective
Item 20 refers to the following diagram which shows the longitudinal section of the stem of a plant.
The part labelled X is the
cork cell
cambial cell
cortical cell
companion cell
Under which conditions will the rate of transpiration in plants be HIGHEST?
Sunny and low wind speed
Sunny and high wind speed
Cloudy and low wind speed
Cloudy and high wind speed
Mineral salts in plants are transported MAINLY through the
cambium
sieve tubes
parenchyma
xylem vessels
Storage organs in plants provide food I. for vegetative reproduction II. for the developing embryo III. to ensure survival when nutrients are scarce
I and II only
I and III only
II and III only
I, II and III
Which of the following is NOT a form of excretion in plants?
Carbon dioxide diffusing in, through the stomata
Substances being stored in the bark of a tree
Water vapour diffusing out, through the epidermis
Stored calcium oxalate crystals in leaves during leaf fall
Item 25 refers to the following diagram of a mammalian kidney.
Into which structure is urine emptied?
I
II
III
IV
Which of the following organs is MOST directly affected when the pituitary gland is malfunctioning?
Kidney
Lung
Skin
Colon
Which of the following is NOT a feature of the leaf of a xerophyte?
Stomata abundant on upper surface
Needle-like leaves
Plugging of stomata
Heavily cutinized
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 or part movement
Reversible, whole or part movement
Irreversible, growth or part movement
Reversible, growth or part movement
Item 30 refers to the following diagram which shows the structure of a typical vertebra.
Which of the following shows the correct labelling of the parts?
I / II / III
II / III / IV
III / IV / II
IV / III / I
Which of the following is NOT true of locomotion?
It allows organisms to find mates:
It is in response to a stimulus.
It allows organisms to find food.
It is a characteristic of all living things.
Item 32 refers to the following results of an investigation of how woodlice respond to light and moisture. The results show the number of woodlice that moved to varying conditions - light, dark, moist and dry. Light Dark Dry Moist Light Dark and and 2 8 0 10 dry moist 1 9 I II III
The above responses are important to the woodlice in order to
ensure that they are close to a food supply
ensure that they do not become dehydrated
provide the best conditions for enzyme activity
provide protection from predators
Item 33 refers to the following diagram which shows a coordinated response to a stimulus in humans.
Stimulus Coordinating centre Response X Y Z
The role of Y in the illustration above is to
stimulate receptors
cause reflex actions
react to stimuli
interpret changes in the environment
For a student to recall his biology notes, action takes place in
a reflex arc
the cerebrum
the cerebellum
the medulla oblongata
Which hormone causes a person to show superhuman (enhanced) strength in an emergency situation?
Insulin
Adrenaline
Thyroxine
Pituitary hormone
Which three structures of the skin are involved in temperature regulation?
Sweat gland, erector muscle, capillaries
Sebaceous gland, capillaries, temperature receptors
Erector muscle, temperature receptors, sweat gland
Temperature receptors, capillaries, erector muscle
The function of the choroid layer in the eye is to
focus most light rays
prevent internal reflection
maintain the shape of the eyeball
control the amount of light entering the eye
Which of the above labelled components reduce friction?
I and II
I and IV
II and III
II and IV
At which point does moulting occur?
I
II
III
IV
Which of the following is the correct sequence of activities?
I, II, III, IV
II, I, III, IV
IV, I, II, III
IV, III, II, I
Which of the labelled parts is responsible for the production of male gametes?
I
II
III
IV
Item 42 refers to the following diagram.
The MOST appropriate heading for this diagram is
ovulation
fertilization
pollination
reproduction
During pollination, pollen grains which are small, light, odourless and smooth are MOST likely carried by
wind
birds
water
insects
Contraception is used PRIMARILY to
limit the size of families
cause infertility in humans
prevent the spread of sexually transmitted infections
increase the world's population
Which of the following statements is true of wind dispersed seeds?
They are found in succulent fruit.
They have hooks which allow them to be taken great distances.
They are rapidly strewn from dry pods.
They have feathery hairs which allow them to be taken great distances.
Which of the following events does NOT occur during mitosis?
The chromatids exchange genetic information.
Chromosome makes an exact copy of itself.
Two chromatids are joined by a centromere.
Chromosomes align themselves on the equator of the spindle.
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
A girl has blood group A and her brother has blood group B. Her mother is blood group AB. They both have the same father. Which of the following are possible genotypes of the father?
I or II only
I or IV only
II or III only
III or IV only
A plant breeder grows a new variety of tomato which has desirable characteristics. To develop this variety he sometimes encloses single flowers in bags. Which of the following is MOST likely a reason for this?
To ensure fertilization
To ensure pollination
To prevent damage by rain
To prevent entry of pollen from other plants
Which of the following is an ecological implication of genetic engineering?
Loss of biodiversity
Humans 'playing God'
Higher prices for organic foods
Reduced incidence of allergic reactions
In which of the following ways can hypertension be treated or controlled? I. Eating iron-rich foods II. Low carbohydrate diet III. Low salt intake IV. Exercise
I and II only
II and III only
III and IV only
I, II, III and IV
Abuse of prescription drugs is considered a disease because
it is costly to families
it reduces human productivity
many people are involved in it
it affects the functioning of the body
Which of the following is a sign of AIDS?
Sterility
Skin rash
Blister on genitals
Yellow discharge from penis
A vector is defined as an organism that
bites human
causes diseases
lives on other organisms
transmits disease organisms
A boy stepped on a nail in the garden. He is rushed to the hospital where he is given antiserum. This provides
artificial passive immunity
natural passive immunity
artificial active immunity
natural active immunity
A group of fish, snails, watergrass and tadpoles living in a freshwater pond may be described as a
niche
habitat
community
population
The mark, release, capture technique would MOST likely be used to determine
lichens on a tree trunk
watergrass on a football field
the population of plankton in a pond
the population of snails in a vegetable plot
Which graph BEST represents changes in population density of a natural animal population, with respect to time?
I
II
III
IV
Which of the following is NOT an example of a renewable energy resource?
Oil
Wind
Solar
Biomass
Which of the following practices does NOT help to conserve the environment?
Overgrazing
Crop rotation
Reafforrestation
Using natural fertilizers