WorksheetsForm E
Total questions: 70
Worksheet time: 38mins
What is the approximate percentage of oxygen in expired air?
0.04%
4%
16%
21%
Compared with atmospheric air, air breathed out by a human contains
less water vapour, less carbon dioxide.
less water vapour, more carbon dioxide.
more water vapour, less carbon dioxide.
more water vapour, more carbon dioxide.
A rat has the scientific name Rattus rattus.
What do the two parts of this name refer to?
genus and species
kingdom and genus
kingdom and species
variety and genus
What is a correct way of naming an organism using the binomial system?
Common buttercup
ranunculus acris
Ranunculus acris
Ranunculus sp
Some lizards detach their tails when threatened by a predator. Which characteristic is shown?
excretion
growth
reproduction
sensitivity
Many snakes that belong to the viper family are unusual in that they give birth to live young. This is usually a characteristic of which vertebrate group?
amphibians
birds
bony fish
mammals
Active transport is the movement of
molecules from a region of their higher concentration to a region of their lower concentration.
particles from a region of lower concentration to a region of higher concentration using energy from respiration.
urine by relaxation of a sphincter muscle in the bladder.
water through a partially permeable membrane from a more dilute to a more concentrated solution.
Why does oxygen diffuse into the blood from an alveolus in the lungs?
The oxygen concentration in the alveolus is greater than the carbon dioxide concentration in the blood.
The oxygen concentration in the alveolus is greater than in the blood.
The oxygen concentration in the blood is greater than in the alveolus.
The oxygen concentration in the blood is greater than the carbon dioxide concentration in the alveolus.
Which structure provides the best surface for diffusion?
atrium
bronchioles
ileum
trachea
How do carbon dioxide and oxygen move in and out of a mesophyll cell?
active transport
diffusion
respiration
transpiration
Small molecules are used as the basic units in the synthesis of large food molecules. Which statement is correct?
Amino acids are basic units of carbohydrates.
Fatty acids are basic units of glycogen
Glycerol is a basic unit of oils.
Simple sugar is a basic unit of protein.
When a substance is added to meat, amino acids are produced. What is this substance?
a hormone
an enzyme
an oil
water
Which food-testing reagent shows a positive result when it turns from blue to purple?
Benedict’s solution
biuret reagent
ethanol
iodine solution
Which pair of substances is transported in the phloem?
amino acids and protein
Amino acids and sucrose
protein and starch
starch and sucrose
Water is a good solvent. What does this mean?
It dissolves well in many other substances.
It flows easily through vessels.
It is permeable to gases
Many substances dissolve well in it.
What does the digestion of starch produce?
fatty acids
glucose
mineral salts
water
Which elements do carbohydrates contain?
carbon, hydrogen and oxygen
carbon, hydrogen and sulphur
carbon, nitrogen and oxygen
carbon, nitrogen and sulphur
Which group of compounds ensures that metabolic reactions take place effectively?
carbohydrates
enzymes
fatty acids
hormones
Which effect does a gradual decrease in pH from 13 to 1 have on the action of amylase?
Slows it down only
slows it down then speeds it up
speeds it up only
speeds it up then slows it down
What happens to most enzymes above 60°C?
They are denatured.
They are destroyed by white blood cells
They are digested.
They are made more active.
What is a characteristic of all catalysts?
They are broken down in the reaction.
they are made of protein.
They are not changed by the reaction
They do not change the rate of the reaction.
The temperature of an enzyme-controlled reaction is increased by 10°C. How does this affect the rate of reaction?
It always increases the rate.
it always decreases the rate.
it may increase or decrease the rate.
it has no effect on the rate
In an experiment, the effect of temperature on the action of amylase is investigated. Six different test-tubes are set up, each containing a mixture of amylase and starch solution. Which condition should not be kept the same in each of the six test-tubes?
concentration of amylase
pH
temperature
volume of starch solution
Some plants digest insects and use the nutrients for growth. What must these plants produce to digest the insects?
acids
alkalis
enzymes
hormones
At which temperature do most enzymes from the human body become completely denatured?
0°C
27°C
40°C
65°C
What happens in osmosis?
movement of solute molecules against their concentration gradient
movement of solute molecules down their concentration gradient
movement of water molecules against their concentration gradient
movement of water molecules down their concentration gradient
Which substance is transported by haemoglobin?
nitrogen
oxygen
urea
water
In a person with a low platelet level, which process is slower than normal?
antibody formation
blood clotting
oxygen carriage
phagocytosis
How does insulin move from the pancreas, where it is produced, to the cell where it acts?
along nerves
in the blood
through the digestive system
through the pancreatic duct
Which blood vessel, if it becomes blocked, could lead directly to a heart attack?
coronary artery
pulmonary artery
pulmonary vein
vena cava
What is an example of phototropism?
a chemical messenger produced by a plant
a painful sensation in response to a stimulus
the growth of a plant root towards the centre of the Earth
the growth of a plant shoot towards light
8 The oxygen carrying capacity of the blood of smokers is less than that of non-smokers. Which component of tobacco smoke causes this?
carbon monoxide
nicotine
smoke particles
tar
Which statement about asexual reproduction is correct?
Asexual reproduction produces genetically identical offspring from one parent.
Asexual reproduction produces genetically identical offspring from two parents.
Asexual reproduction produces genetically different offspring from one parent.
Asexual reproduction produces genetically different offspring from two parents.
Which environmental factor is not always a requirement for seed germination?
light
oxygen
suitable temperature
water
Which cross will be pure-breeding?
a female homozygous individual and a male heterozygous individual bred together
a male homozygous individual and a female heterozygous individual bred together
two identical heterozygous individuals bred together
two identical homozygous individuals bred together
artery only
artery and ureter
artery and vein
ureter and vein
The statements describe how a protein is made
1 mRNA passes through a ribosome.
2 mRNA molecules carry a copy of the gene to the cytoplasm.
3 The gene coding for the protein is copied in the nucleus.
4 Ribosomes assemble amino acids into proteins.
What is the order of statements that correctly describes how a protein is made?
2 → 1 → 3 → 4
2 → 3 → 4 → 1
3 → 1 → 2 → 4
3 → 2 → 1 → 4
Which method is used to produce lactose-free milk?
filtering milk to remove lactose
heating milk to break down lactose
using lactase to break down lactose
using lipase to denature lactose
What is a correct statement about lymphocytes?
Lymphocytes engulf pathogens.
Lymphocyte numbers can be reduced when a person is infected with HIV.
Lymphocytes produce antigens.
Lymphocytes transport oxygen to different parts of the body
Which statement is a correct description of the role of meiosis?
to create genetically identical daughter cells
to halve the chromosome number in the daughter cells
to create diploid daughter cells
to maintain the chromosome number in the daughter cells
Which organelle produces energy for the cell?
Golgi apparatum
Mithocondrion
Nucleum
Endoplasmic Reticulum
The nucleus is the
Power house of the cell
Waste collector in the cell
Control center of the cell
protein factory in the cell
It is mainly membrane-enclosed spaces stacked on top of each other
Rough ER
Mitochondria
Smooth ER
Golgi Apparatus
Which blood vessels carries oxygenated blood from the heart to the whole body?
Vena cava
Aorta
Pulmonary vein
What happen when the ventricles of the heart contract?
The semilunar valve close
The semilunar valve open
The atrioventricular valve open
Which valve action results from an increase in pressure in the atrial of the heart?
The opening of the semilunar valve
The closing of the atrioventricular valve
The opening of the atrioventricular valve
Right atrium and ventricle are separated from the left atrium and ventricle by______________
AV node
SA node
Septum
Where does the sino-atrial node, which generates the electrical impulses that coordinate heart-muscle contracted is located in?
Left atrium
Right atrium
Septum
Where do aorta pump oxygenated blood?
Lungs
Whole body
Brain
The process of transmission of genes from parents to offspring is called.....
Genetics
Heredity
Evolution
Genesis
Variations
Combination of new characters
New Characters
Combination of new characters Of offspring
All the above
Find homozygous
TT
Tt
tt
TT and tt
Heterozygous
Tt
TT
tt
None
Genetically constitutional structure of the organism is known as....
Genotype
Phenotype
Homologous
Heterozygous
Nitrogen cycle
Recall where in the nephron ultrafiltration occurs.
Proximal convoluted tubule
Collecting duct
Urethra
Bowman's capsule
Recall which hormone controls the levels of water reabsorbed from the collecting ducts.
Testosterone
Anti-diuretic hormone
Adrenaline
Progesterone
What is composed of several food chains in an ecosystem that intersect and depend on one another?
niche
feeding level
energy pyramid
food web
What is the ultimate source of energy in any food chain?
the sun
producers
consumers
decomposers
All the nonliving things in an environment are called the ________ factors.
abiotic
biotic
ecological
inorganic
All are considered to be abiotic factors EXCEPT
moisture
air currents
predators
temperature
Which on of these represents from smallest to largest in which all organisms are organized?
Organism, cell, organ, organ system, tissue
Cell, tissue, organ, organ system, organism
Cell, organism,organ system, organ, tissue
Tissue, organ, organ system, cell, organism
Every day your body takes in food and breaks it down into usable materials. The system responsible for performing this task is the
skeletal system
muscular system
digestive system
urinary system
Which type of waste is removed by the respiratory system?
carbon dioxide
bile
urine
amino acids
During cellular respiration, your cells use oxygen and sugars to create ________________________which can be stored in the Mitochondria.
food
energy
urine
waste
