Item 8 refers to the following diagram of a typical plant cell.
8.
Which of the labelled parts is NOT found in an animal cell?
- (A)
I
- (B)
II
- (C)
III
- (D)
IV
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CSEC Biology Paper 1 May/June 2012 - Free CXC Past Paper with Answers
Free CXC Biology Paper 1 May/June 2012 past paper from 2012. 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 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
Which of the following are involved in the cycling of nutrients in nature? I. Bacteria II. Plants III. Earthworms IV. Humans
I and II only
III and IV only
I, II and III only
I, II, III and IV
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
Item 4 refers to relationships between the following pairs of organisms. I. Barnacles on a shark's back II. Shark/man III. Man/malaria protozoan
Which of the following correctly identifies these relationships?
Commensalism / Predator/prey / Mutualism
Commensalism / Predator/prey / Parasitism
Predator/prey / Commensalism / Mutualism
Predator/prey / Mutualism / Parasitism
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 reproduce faster in low temperatures.
They are more abundant in damp places.
They prevent the accumulation of dead organic matter.
Which of the following organelles is the site of aerobic respiration?
Nucleus
Cytoplasm
Chloroplast
Mitochondrion
Item 8 refers to the following diagram of a typical plant cell.
Which of the labelled parts is NOT found in an animal cell?
I
II
III
IV
Plant cells do not burst when placed in water because
all the water that enters the cell can be stored in a vacuole
plant cells are surrounded by cellulose cell walls
ions and other substances in solution move out of the cell as soon as water enters
as water enters one cell it immediately passes into an adjacent cell along an osmotic gradient
Which of the following combinations correctly shows a gas that is a raw material and a gas that is a product of photosynthesis?
Carbon dioxide / Oxygen
Carbon dioxide / Nitrogen
Oxygen / Carbon dioxide
Oxygen / Nitrogen
Which of the following are NOT autotrophs?
Algae
Mosses
Ferns
Fungi
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
Item 13 refers to the table below which shows the observations when a food was tested using different reagents.
The food MOST likely contained
starch and protein only
reducing sugar and starch only
reducing sugar, starch and protein
protein, fat and non-reducing sugar
Which of the following options is a function of hydrochloric acid in the stomach?
Emulsifying fat
Breaking down starch
Hydrolysing complex sugars
Providing a medium for pepsin
The increase in temperature in the vessel is BEST explained by the fact that the seeds are
numerous
taking in water
placed close together
using their food stores
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 characteristics is NOT a feature of respiratory surfaces?
Large surface area
Permanently moist
Good supply of blood
Thick membrane
The reactants in aerobic respiration are
water and oxygen
glucose and oxygen
water and carbon dioxide
glucose and carbon dioxide
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
Which of the following features is MOST responsible for the efficient uptake of oxygen by red blood cells?
Small size
Softness
Flexibility
Disc shape
Which of the following plants does NOT have a modified vegetative storage organ?
Carrot
Ginger
Mango
Potato
Mineral salts in plants are transported MAINLY through the
cambium
sieve tubes
parenchyma
xylem vessels
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
Which of the following is NOT an excretory product in humans?
Urea
Water
Undigested food
Sodium chloride
Items 25-26 refer to the following diagram of a mammalian kidney.
In which part of the kidney is the loop of Henlé located?
I
II
III
IV
Into which structure is urine emptied?
I
II
III
IV
Item 27 refers to the following diagrams.
Which of the muscle-bone attachments shown above is accurate?
The MAIN function of cartilage at the end of long bones is to
protect nerves
lubricate joints
reduce friction
increase flexibility
Movement is important to the survival of a plant because it ensures that it I. can find food II. grows towards light III. grows towards water IV. can respire
I only
I and IV only
II and III only
I, II, III and IV
What type of vertebra is shown above?
Sacral
Lumbar
Cervical
Thoracic
The receptor is the
hot object touched
heat from the hot object
sensory endings in the skin
muscles that contract
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
dry moist
2 8 0 10 1 9
I II III
The above responses are important to the woodlice in order to (A) ensure that they are close to a food supply (B) ensure that they do not become dehydrated (C) provide the best conditions for enzyme activity (D) provide protection from predators
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
Which of the following control the amount of light that enters the eye? I. Radial muscles of the iris II. Circular muscles of the iris III. Ciliary muscles associated with the lens
I and II only
I and III only
II and III only
I, II and III
Which of the following diagrams correctly represents the pathway of the transmission of an impulse for a spinal reflex?
Which hormone causes a person to show superhuman (enhanced) strength in an emergency situation?
Insulin
Adrenaline
Thyroxine
Pituitary hormone
Which of the following functions of the skin is an example of homeostasis?
Storage of fats
Release of sweat
Secretion of sebum
Maintenance of body temperature
What is the average change in height, in centimetres, of the corn seedlings during the three days?
2.00
2.25
2.50
2.75
The stem at Q grows upward because
it is attracted to light
the tip can only grow if it is pointing upward
auxins accumulated on the upper side of the shoot
auxins accumulated on the lower side of the shoot
Item, 38 refers to the following diagram which shows the growth of a plant after a few days in sunlight. Coleus plant P Q
Which of the following sequences of events is correct?
Fertilization → implantation → copulation → gestation
Fertilization → implantation → gestation →copulation
Copulation → fertilization → implantation → gestation
Copulation→ implantation → fertilization → gestation
The reproduction of Amoeba by binary fission is an example of asexual reproduction because
two offspring are produced by one parent
the nucleus is not involved in the cell division
the nucleus divides by meiosis
the chromosome number is halved
Which of the following involves the process of asexual reproduction?
Wind pollination
Insect pollination
Vegetative propagation
Artificial insemination
Item 42 refers to the following diagram.
The MOST appropriate heading for this diagram is
fertilization
ovulation
pollination
reproduction
Which of the following comparisons of the male and female reproductive systems is INCORRECT?
Testis / Ovary
Glands / Uterus
Sperm / Egg
Sperm duct / Fallopian tube
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 confirms that a 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.
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
Which of the following is the BEST explanation for these observations? (A) More food is available in green areas. (B) Green grasshoppers are better adapted. (C) Camouflaging protects grasshoppers from predators. (D) Brown grasshoppers mutate when placed in green areas.
More food is available in green areas.
Green grasshoppers are better adapted.
Camouflaging protects grasshoppers from predators.
Brown grasshoppers mutate when placed in green areas.
Which pattern will produce a 1:2:1 ratio of phenotypes?
Which of the following is NOT involved in natural selection?
Grafting
Meiosis
Variation
Mutation
Which of the following correctly lists examples of pathogenic, nutritional deficiency and physiological diseases?
Diabetes / AIDS / Anaemia
AIDS / Diabetes / Anaemia
Anaemia / Diabetes / AIDS
AIDS / Anaemia / Diabetes
Which of the following trigger the formation of blood clots?
Thrombocytes
Erythrocytes
Lymphocytes
Phagocytes
Through which of the following can natural immunity be obtained?
I. Blood transfusion II. Breast milk III. The placenta
I and II only
I and III only
II and III only
I, II and III
A vector is defined as an organism that
bites human
causes diseases
lives on other organisms
transmits disease organisms
Item 55 refers to the following methods of disease treatment/control.
I. Improved personal hygiene II. Isolation of persons with the disease III. Good sanitary practices, for example, 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
Fish, snails, watergrass and tadpoles living in a freshwater pond may be described as
a habitat
a population
an ecosystem
a community
Which of the following sampling methods are used to estimate the distribution of species of organisms living in soil?
I. Nets II. Quadrats III. Bottles IV. Jars
I and II only
I and III only
II and III only
III and IV only
Two soil components that are derived from the parent rock material are
sand and humus
sand and mineral salts
humus and mineral salts
clay and microorganisms
Which of the following resources is renewed through natural cycles?
Natural gas
Bauxite
Forest
Gold
Which of the following practices does NOT help to conserve the environment?
Overgrazing
Crop rotation
Reafforestation
Using natural fertilizers