WorksheetsBiology Pre-CXC Examination
Total questions: 40
Worksheet time: 1hrs 20mins
Which of the following features is used to classify a group of organisms as Class Insecta?
Size
Shape
Colour
Number of Segments
Living organisms, such as plants, are affected by abiotic factors which determine where they become established. Which of the following options describes some of these determining factors?
Sunlight availability, soil pH, minerals
Parasitism, commensalism, mutualism
Sediment size, shape and colour
Deforestation, slash and burn, shifting cultivation
From the diagram of a food web, identify the organism in Trophic Level 1
zooplankton
phytoplankton
small fish and crustaceans
marine mammals and people
What type of organism is a mushroom?
producer
consumer
detritivore
decomposer
What is the relationship between a wild pine and a Flamboyant tree?
Parasitism
Commensalism
Mutualism
Synergism
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
Reafforestation
Using natural fertilizers
Human activities would have the LEAST immediate impact on
coral bleaching
eutrophication
overpopulation
formation of fossil fuels
Which of the following effects of climate change poses the GREATEST threat to small islands?
Rising sea level
Ocean acidification
Increased greenhouse gas
Increased global temperature
The GREATEST threats to the survival of coral reefs are
decreased nitrogen levels
decreased greenhouse gases
increased ocean temperatures
increased dissolved oxygen levels
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
Which of the following options MOST likely identifies the organelles, I and II above?
nucleus and chloroplast
Mitochondrion and nucleus
Mitochondrion and chloroplast
Nucleus and mitochondrion
Which of the following organelles is correctly matched with its function?
RIBOSOME - Site of protein synthesis
MITOCHONDRION - Air space in the cell
NUCLEUS - Controls movement of fats in the cell
VACUOLE - Site of energy use
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 sometimes requires a partially permeable membrane.
With both processes, molecules move from a high concentration to an area of lower concentration.
A plant carries out photosynthesis and stores some of the food produced. What is the food produced?
fat
starch
protein
amino acid
Referring to the diagram shown, which of the following statements BEST accounts for the shape of the graph?
As photosynthesis rates increase, there is a decrease in carbon dioxide levels.
As light intensity increases, the rate of photosynthesis also increases, until a stationary phase exists, when denaturation of the enzymes occurs.
As light intensity increases, there is an increase in photosynthesis, until there is no further increase in the rate due to some other limiting factor
As carbon dioxide levels gradually increase, there is a similar increase in the rate of photosynthesis, until a plateau phase exists where no further increase in carbon dioxide results in any further increase in photosynthesis.
Which of the following can be ingested to prevent osteomalacia or rickets?
Calcium
Vitamin A
Vitamin C
Magnesium
The role of respiration is BEST described as the
release of energy
absorption of oxygen
breakdown of carbohydrates
liberation of carbon dioxide
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
Translocation of sucrose in plants occurs via specialized vessels which
are dead, narrow cells
are abundant in mitochondria
contain sieve pores in their end walls
are thin, hollow tubes of lignin
Which of the following options correctly matches the storage organs to their stored nutrients?
ROOTS - Starch; FRUITS - Sucrose; LIVER - Glycogen
ROOTS - Starch; FRUITS - Fructose; LIVER - Glucose
ROOTS - Proteins; FRUITS - Glucose; LIVER - Fats
ROOTS - Fats; FRUITS - Glucose; LIVER - Glycogen
The BEST description of the role of excretion in living organisms is to
produce urine
produce faeces
get rid of toxic waste
get rid of excess water
Which option correctly identifies the functions of the parts labelled I, II and III?
I - Ultrafiltration; II - Water Conservation; III - Selective Reabsorption
I - Ultrafiltration; II - Selective Reabsorption; III - Under the influence of ADH
I - Water Conservation; II - Under the influence of ADH; III - Urine Production
I - Selective Reabsorption; II - Ultrafiltration; III - Under the influence of ADH
Which of the following organs does the mammalian skeleton protect?
Stomach
Pancreas
Bladder
Duodenum
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
Which of the following is the correct sequence of activities involved in the menstrual cycle?
I, II, III, IV
II, I, III, IV
IV, I, II, III
IV, III, II, I
Where does fertilization of the egg cell or ovum occur in flowering plants?
Stigma
Endosperm
Pollen Grain
Embryo Sac
Which of the labelled parts is responsible for the production of male gametes?
I
II
III
IV
A vector is defined as an organism that
bites humans
causes diseases
lives on other organisms
transmits disease organisms
Which of the following organisms transmits the yellow fever virus?
culex
Tsetse
Anopheles
Aedes aegypti
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
If the bubbles given off by the plants were collected and tested, the gas present would MOST likely be
oxygen
hydrogen
nitrogen
carbon dioxide
The results of a food test performed on three food samples X,Y and Z are found in the table. The samples X,Y and Z MOST likely contain:
X -non-reducing sugar; Y - starch; Z - protein
X- protein; Y - reducing sugar; Z - starch
X - starch; Y - protein; Z - reducing sugar
X - protein; Y - starch; Z - non-reducing sugar
Excess amino acids in the diet are
passed out in faeces
converted to fat and stored
converted to urea in the liver, then excreted
taken directly to the bladder for excretion in urine
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 surface area of the lungs is greatly increased by the
double membranes of the pleura
large numbers of alveoli
dense network of capillaries
branching of the bronchioles
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
Which of the following are involved in the formation of blood clots?
Platelets
Antibodies
Phagocytes
Lymphocytes
Which of the following statements is NOT true of the xylem of a flowering plant?
It is non-living
It contains mitochondria
It has lignifies walls for support
It transports water and mineral salts.
