biology

1 what are characteristics of all organisms?
a_ egestion and excretion
b_ egestion and nutrition
c_ excretion and nutrition
d_ excretion and photosynthesis

2 the scientific name for the golden eagle is aquila chrysaetos.
what is the genus of the golden eagle?
a aquila
b_chrysaetos
c eagle
d_ golden

3. which row shows structures that are present in both root hair cells and palisade mesophyll cells?
[| -cetwett [corns [ons | veel
a v v v x key
b x v v v jv = present
cc v x v v x = absent
d v v x v

4 the photomicrograph shows a plant cell. the length of line xy is 90mm. the actual length of the
cell is 30 um.
a |
xx ¥
what is the magnification of the photomicrograph?
a x300 b  x3000 c x33000 d x330000

5 the diagram shows an experiment demonstrating osmosis using a dialysis tubing bag.
glass tube
water
sugar solution
dialysis tubing
bag
after 30 minutes, the level of the liquid in the glass tube goes ......1...... because the water had a
-2...... water potential than the sugar solution.
which words correctly complete the statement?
pf tk
a down lower
b down higher
cc up lower
d up higher

6 the diagram shows the movement of glucose molecules across a cell membrane.
low concentration
glucose
os \ i o fe)
o
eeeccceece) w ceeccceece) @eeecesece eececcceee
cell rete iw — |_|
oqooooqoo0o ooqocoqoo0o s88s089068 ei oqqoo00000
o e) o
© o o
o @ o o
energy oo o
o
o high concentration o o
which statement describes molecule t?
a_ltis a fat molecule used to transport glucose down a concentration gradient.
b_itis a fat molecule used to transport glucose against a concentration gradient.
c_itis a protein molecule used to transport glucose down a concentration gradient.
d_itis a protein molecule used to transport glucose against a concentration gradient.

7 the diagram shows part of a protein molecule.
qo os
what does x represent?
a amino acid
b fatty acid
c_ glycerol
ds sugar

8 the structure of dna involves two strands coiled together to form a double helix.
which pairing of bases between the two strands is correct?
a aandg b aandt c canda d candt

9 whatis true of all enzymes?
soe
effective at ph7
a v jv key
b jv x v=yes
cc x v x =no
d x x

10 which statement about human enzymes is correct when they are at temperatures above 80°c?
a the enzyme molecules are denatured.
b_ the shape of the active site is stable.
c more enzyme-substrate complexes form.
d_ more product is formed by the enzyme.

11 an experiment is set up to investigate gas exchange in aquatic plants.
—_ hydrogencarbonate
indicator solution
light ——» 9
ss)
vay aquatic plant
n on b
nos{4
vz
the hydrogencarbonate indicator solution is orange at the start.
which colour is it after three hours?
a blue-black
b_ orange
c_ purple
d_ yellow

12 certain factors are needed for photosynthesis.
if a factor is in short supply, it limits the rate of photosynthesis.
which of these could be limiting factors?
1 carbon dioxide
2 oxygen
3 _ light intensity
a iand2 b 1and3 c 2and3 d 3only

13 the haemoglobin concentration in the blood of a person is 80g/dm*. the accepted normal
concentration is 120g/dm? or above.
which substance may be lacking in their diet?
a calcium
b fats
c fibre
d_iron

14 which statement about physical digestion is correct?
a_ lt increases the surface area of food.
blt involves enzymes.
c_ it takes place in the mouth only.
d_ it produces smaller molecules.

15 which statement describes the effect of atmospheric humidity on the rate of transpiration?

a_ in high humidity, the transpiration rate is high because there is slow diffusion of water vapour
through stomata.

b_ in high humidity, the transpiration rate is low because there is rapid diffusion of water vapour
through stomata.

c_ in low humidity, the transpiration rate is high because there is rapid diffusion of water vapour
through stomata.

d_ in low humidity, the transpiration rate is low because there is slow diffusion of water vapour
through stomata.

16 sucrose and amino acids move around a plant from sources to sinks.
which row shows the sources and sinks?
palisade
root cortex cells xylem vessels
mesophyll cells
a source and sink neither source
b sink sink source and sink
cc neither source and sink sink
d source and sink source neither

17 which statements describe how the structures in the circulatory system function?
1 amuscular pump to push blood into vessels
2 valves to ensure one-way blood flow
3. veins to take blood away from the heart
4 vessels to return blood to the heart
a 1,2and3 b 1,2and4 c 1,3 and4 d 2,3 and4

18 the diagram shows a section through the heart.
which part is the septum?
: >|
ay (\q—
quy

19 the cholera bacterium toxin causes dehydration and loss of salts from the blood in humans.

which statement explains the reason for this?

a_ chloride ions are secreted into the small intestine where they increase the water potential.

b_~ chloride ions are secreted into the small intestine which causes water to move into the
intestine by osmosis.

c_ chloride ions are secreted into the small intestine which causes water to move out of the
intestine by osmosis.

d_ chloride ions are secreted into the small intestine which causes the water potential of the
blood to decrease.

20 during inspiration, the processes listed take place.
p_ volume of the thorax increases
q air rushes into the lungs
r__ pressure in the thorax decreases
s external intercostal muscles contract
t diaphragm moves down, ribs move upwards and outwards
what is the correct sequence for these processes?
a q>~>p>~s9rrot
b s»~t>~p>~r->q
c q>p9>sh9tor
d s~q>r>p>t

21 in the chemical equation for anaerobic respiration in yeast, the numbers have been replaced by
the letters w, x, y and z.
cwhxow — ycyhzoh + ycoy
which number is z?
a 2 b 5 cc 6 d 12

22 a student measured their oxygen consumption before, during and after exercise.
the results are shown in the graph.
at rest during exercise after exercise
3.0 it al a a a an an at a a i i it gi i a a a ti ad lt ll dnd i id
ptt tr rrr rr yy ry yr rr er re
sre eee se ee ee eee eee
serre pes se ee eee eee
2.5 =f eee pepe prd eee ee eeeehth
beer eee eere
htt pec eeec eee
2.0 -feeceeeeeeeee eee eee peele chee peele ee ee eee
feeeeeeeeeeeeeaeeee ee ee eeeeee eee eee eee eee eee ceh
oxygen consumption petceerens / 000s c
yam? per minute --eeececeeeeeecrreeeeeee eee eere eee cee ee eeeee heh
i dents eee eeeee eee ache
f--—-heee-ev-——--—-— e
9.0 <eeeeeeeeeeeeeeeeeeeeepreeee eee eee
se
ee ess es eee ee ce ee
ee sses eee 2 ee cee ee
0.5 -ceeceeeeeeeee eee eeeecec peele deep h
poebeseseet 1] tell lette pepe bebe
i
0.0 seer ee ee ee eee
0 5 10 15 20 25
time/ minutes
at which time is the oxygen debt being removed?
a 5-10 minutes
b 5-15 minutes
c 15-20 minutes
d 20-25 minutes

23 which row shows where glucose will be found in the body of a healthy human after eating a
meal?
[[enataroy | venatvein | aomeuis | open | wee
a yes no yes yes yes
b yes yes no no no
cc yes yes yes yes no
d no yes no no yes

24 the events listed involve neurotransmitter molecules at a synapse.
1 they bind with receptor proteins.
2 they diffuse across the synaptic gap.
3. they enter the synaptic gap.
4 they are released from vesicles.
what is the sequence of events that occur when an impulse arrives at the synapse?
a 3525154
b 453>1->2
c 373475152
d 453>2->1

25 what occurs during accommodation to focus on distant objects?
[me [ae ee
muscle shape ligaments
a contracts fat slack
b relaxes thin tight
cc contracts fat tight
d relaxes thin slack

26 what is a correct statement about auxin in shoots?
a _itis made only on the shaded side of the shoot.
b_itis more concentrated on the side of the shoot that receives the most light.
c_ it moves through the shoot by osmosis.
d_ it stimulates cell elongation.

27 whatis a correct statement about antibiotics?
a_ bacteria may become resistant to antibiotics as a result of artificial selection.
b_ bacteria may become resistant to antibiotics as a result of natural selection.
c_ viruses may become resistant to antibiotics as a result of artificial selection.
d_ viruses may become resistant to antibiotics as a result of natural selection.

28 potatoes are stem tubers. a tuber can be placed in the ground to grow into another plant, which
can grow many more tubers.
y ale ee,
5d y
oe” | aan <7]
—
, 4 months 7 | 4
sp ra
- 7 oe
> oo)
the diploid number of the potato plant is 24.
how many chromosomes will there be in the cells of the stem, the leaf and the pollen?
[sem [teat [poten |
a 24 24 12
b 24 12 48
cc 48 12 24
d 48 48 12

29 which row about asexual reproduction is correct?
offspring offspring
blll identical to | identical to
parents
parents each other
a one no yes
b one yes yes
cc two no no
d two yes no

30 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 describes how a protein is made?

a 2>1>3->4

b 2>53->4->1

c 3313254

d 33527>1->4

31 which parents could produce offspring with blood group o?
a heterozygous father with blood group a and heterozygous mother with blood group b
b_ heterozygous father with blood group a and homozygous mother with blood group b
c homozygous father with blood group a and heterozygous mother with blood group b
d homozygous father with blood group a and homozygous mother with blood group o

32 the diagram shows the inheritance of albinism in one family. albinism is an inherited condition
caused by a recessive allele.
if 2 key
[| unaffected male
c) unaffected female
3 4 5 6 7 male with albinism
o female with albinism
7 8
which individuals must be heterozygous for this condition?
a 1and2 b 4and7 c 5,6and7 d 5and6 only

33 which term is a genetic change?
a allele
b_ genotype
c_ mutation
d_ phenotype

34 which adaptation may be present in a xerophyte?
a leaves with small surface area and large numbers of stomata
b little or no xylem tissue and leaves with large surface area
c stomatal hairs and rolled leaves
d_ thin or no cuticle and deep roots

35 the diagram shows energy flow from the sun, through a food chain and into the environment.
vi /
. 2 .
plant ———-> animal ————~ animal
what is the form of energy for each numbered arrow?
[seve | steee2 |
a heat chemical
b heat kinetic
cc light chemical
d light kinetic

36 a few yeast cells were placed in a container of nutrient solution.
the graph shows how their population size changed over time.
3
population ‘
size 2
al
time
which row shows when the reproduction rate was greater than the death rate for the numbered
phases on the graph?
reproduction rate greater than death rate
a v v v x key
b v v x x v/=yes
cc v x x x x =no
d x v v v

37 the number of atlantic bluefin tuna fish found in the atlantic ocean has significantly decreased in
the last 50 years.
which method would make the biggest improvement in the conservation of tuna fish stocks?
a decreasing the size of holes in fishing nets
b_ genetic modification of tuna
c introducing fishing quotas
d selective breeding of tuna

38 the bloodworm is an organism that is found in heavily polluted water.
the diagram shows where raw sewage flows into a river.
where would there be fewest bloodworms?
input of raw
sewage
ge, }
ss
yo b c p
direction

of flow

39 the diagram shows a bacterial cell.
which part is useful in genetic modification?
b c
a
d

40 which statement about genetic modification is correct?
a_ it involves choosing which individual organisms are used for breeding.
b_ it is always done using genes from the same species.
c_ it produces a new combination of genes.
d it produces exact copies of individual organisms.

Solve 0610_s23_qp_21