2007-cEBtoPAPER 2

HONG

HONG

KONG

KONG

EXAMINATIONS

CERTIFICATE OF

AND ASSESSMENT AUTHORITY

EDUCATION EXAMINATION 2OO7

BtoLoGY PAPER 2 (MULT|PLE-CHOICE)

11.00 am - 12.00 noon (1 hour)

Subject Gode 150

.I,t',f t

l. Read carefully the instructions on the Answer Sheet. Stick a barcode label and insert the informationrequired in the spaces provided.

When told to open this book, you should check that all the questions are there. Look for the words 'END OFPAPER' after the last question.

All questions carry equal marks.

ANSWER ALL QUESTIONS. You should mark all your answers on the Answer Sheet.

You should mark only ONE answer for each question. If you mark more than one answer, you will receiveNO MARKS for that question.

No marks will be deducted for wrong answers.

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@6#4 il&FTftE IXWHF,IEHong Kong Examinations and Assessment AuthorityAll Rights Reserved 2007

Not to be taken away before theend of the examination session

2007-cE-Bro 2-l

There are 36 questions in Section A ond 24 questions in Section B.The diagrnms in this paper are NOT necessarily drawn to scale.

SECTION A

Which of the following correctly compares a leaf epidermal cell and a root hair cell of a flowering plant?

,6D=b6

Which of the following features enables a plant to survive successfully in a shady environment?

A. stem with more lenticels /B. stem with less supporting tissue /Cr* leaf with very broad and flat leaf blade VD.* leaf with similar stomatal densitv on both surfaceb

/ Which of the following conectly describe photosynthesis?

, i .t (l) It is a catabolic process. / ,(2) It is an energy conversion process. /(3) It is a process by which producers make food.{

/q. Which of the following features is common to dogs, ducks and dolphins?II(

A. They breathe with lungs.y They have claws on their limbs.C.. They possess mammary glands. /@( They have hairs on their bodies. . I

V

A. (l) and (2) onlyB. (l) and (3) onlyC. (2) and (3) onlyD. (l), (2) and (3)

Which of the following energy sources is non-renewable?

A. tidal powerB. wind powerC. solar powerD. nuclear power

Which of the following ways of using the vegetation from the same piece of land provides the greatestamount of energy to human beings?

A. to provide food for direct human consumption"8. to raise cows to provide milk for human consumption-L to raise cows to provide meat for human consumption I-d

:H:ffi_?;Xi, uring half to provide milk and the other t$tt to provide meat for human

{

Leaf epidermal cellwith cuticle*rwith chloroplasfwithout vacuolewithout mitochondria

Root hair cellwithout cuticlel'without chloroplast /with vacuole (with mitochondria

. /

2007-cE-Bro 2-2

Directions: Questions 7 and 8 refer to the following experiment:

Two boiling tubes containing 5 cm3 of hydrogen peroxide solution and I cm3 of catalase solutionrespectively were kept at 25"C for l0 minutes. The contents of the two tubes were then mixedand maintained at the same temperature, and the amount of oxygen released was recorded for 5minutes. The results are shown in the graph below:

Accumulativeamount of

oxygen

0 1 2 3 4 5Time (min)

The line levels off at the 3'd minute. Which of the following is a correct explanation for this?/

The reaction stops at the 3'd minute because catalase has been used up. , /The reaction stops at the 3'd minute because hydrogen peroxide has been usJd up.The reaction rate reaches the maximum at the 3'd minute because the amount of oxygenreleased is highest.The reaction rate reaches the maximum at the 3'd minute because there is no moreincrease in the amount of oxygen released.

The same experiment was repeated but the contents were kept at 35"C. Which of the following would bestindicate the results of this experiment?

h ,B . v

erL4

.4r-

Accumulativeamount of

oxygen

vAccumulative

amount ofoxygen

D.

Accumulativeamount of

oxygen

t 2 3 4Time (min)

1 2 3 4Time (min)

3 5 " C r ' ' ' -. t a t - -

/ . t '

. / ' . ' iS.C./ '

e/

/ t*&.C.V.

II

/- a - - - - - / - - -

1 < o l - \ . 'L J \ J . /

. t / '2 , z '

, t . / ' 3 5 o C

3-ioc - -. -)/ ' - '

./."ri,""/ r t

L J v

1 2 3 4Time (min)

Which of the following structures is supported by cartilage?

aortaurethratracheaoesophagus

C.

Accumulativeamount of

oxygen

/ . /

t 2 3 4Time (min)

2007-cE-Bro 2-3

Directions: Questions l0 and I I refer to the photomicrographs below, which show a stained human blood smearunder different magnifi cations :

-.G' 3q oJ}Fsfu* quffi-* s

cell t1'pe Y

fq_o#@&ns*Photomiuograph II (x 600)

A student first focused on the blood smear under the microscope and obtained an image as shown inphotomicrograph I. In order to obtain an image as shown in photomicrograph II, which of the followingsteps are necessary?

(1) Turn the nosepiece.(2) Turn the fine adjustment knob.(3) Adjust the position of the condenser.

A. (l) and (2) onlyB. (l) and (3) onlyC. (2) and (3) onlyD. (1), (2) and (3)

$ 2

( 1 )(2)(3)

(1) and (2) only(l) and (3) only(2) and (3) only(1), (2) and (3)

Which of the following correctly describes the functioning of the human breathing system?

&&c.#

r

Photomicrogroph I (x 100)

y The characteristic appearance of cell type Y is due to//

its thicker peripher5ntsits large central vacuole. fthe absence of a nucleus.y'

# , The bronchus cannot change its size.B.v The nasal cavity has hairs to trap dust.

v64- The diaphragm contracts during inhalation. Vntraction.The lung expels air through its muscular co

7 Cigarette smoking results in the deposition of tar on the inner surface of the air sacs. This would decrease

4 the depth of breathing.B. the efficiency of gas exchange.A the resistance for gas diffusion.

q the amount of oxygen that flows into the lungs.

2007-cE-Bro 24

One day, Adam, Brenda, Calvin and Doris were watching a football match of the World Cup. Thefollowing are their dialogues about the heartbeatrate of the football players.

Whose view is correct?

A.B .C.D.

Adam'sBrenda'sCalvin'sDoris's

I and 2 onlyI and 3 only2 and 3 only1 ,2 and3

the growth of pubic hairgrowing tallermenstruationacne on face

r The diagram below shows part of the urinogenital system of a man:

which of the following structures contribute to the content of semen?

t . /

A.B.C.D.

which of the following is a female secondary sexual characteristic?

A.AC.D.

( 1 )

Hey! The footballplayers need moreenergy than us at rest,so their heartbeat rate ishigher.

No, they are well-trained. They canbreathe deepersuch that they havea lower heartbeatrate.

Wrong! They havea stronger heart topump blood. So,their heartbeat ratesshould be lower thanours. u/

I partially agree withCalvin. They have alower heartbeat ratebecause their arteriolewalls are stronger topump more blood.

2007-cE-Bro 2-5

/

Which of the following cunnot help the sperm to get into the uterus during sexual intercourse?

*tsf6D.

contraction of the uteruscontraction of the sperm ductbeating action of the sperm tail /beating action of the cilia on the oviduct V

Which of the following substances will diffuse from maternal blood to foetal blood through the placenta?

&B.&

ureaoxygen /carbon dioxide

th* blood platelets

Directions: Questions 19 and 20 refer to the diagram below, which shows the human alimentary canal and itsassociated structures :

Which of the following structures are responsible for producing secretions that help the digestion ofproteins?

A . l a n d 2 o n l yB . l a n d 3 o n l yC. 2and3 onlyD. 1 ,2 and3

/0. Which of the following would be the possible effect of removing part of structure 4 in an operation?L

g[* Less faeces will be produced.&- Oily faeces will be produced.p Hard faeces will be produced.D. Watery faeces will be produced.

2007-cE-Bro 24

Directions: Questions 2l and 22 refer to the graph below, which shows the changes in pressure of the blood inthe aorta, the left atrium and the left ventricle during a heart cycle.

Pressure

X YTime

Which of the following combinations shows a correct interpretation of the graph and its supporting reason?

Interpretation of the graph Supporting reasonthe left ventricle is contracting between VW the left ventricle's pressure is increasingthe aorta is contracting between XYthe left venfficle is relaxing at point Vthe left atrium starts to relax at point Y

the aorta's pressure is increasingthe left ventricle's pressure is lowthe left atrium's pressure starts todecrease

Semi-lunar vulveclosed /

openedopened r /closed/ /'v

C.D.

(2) and (3) only(l), (2) and (3)

A.A.B-F

III

Which of the following does not contribute to global warming?

soil erosiondeforestationburning fossil fuelrelease of exhaust fumes from vehicles

A.

A"eD.

Which of the following correctly describes the condition of the valves during the period YZ?

Bicuspid volvejX- closed9f openede closedD. opened

A. (l) and (2) onlyB. (l) and (3) only

Which of the following will lead to high blood pressure in the human body?

ffi- Excessive bleeding occurs.(2) Fat is deposited on the wall of arteries. /(3) The wall of the arteries becomes less elasticy'

2007-cE-Bro 2-7

Which of the following diseases can be transmitted by mosquitoes?

Av ian f lu (€ i f tB )Denguefever (HHffi),/Japanese encephalitis (B ^fff ft) /

6(2)(3)

A.B .C.D.

(l) and (2) only(l) and (3) only(2) and (3) only(l), (2) and (3)

P only

Q onlyP and R only

Q and R only

lnterneuronesensory neuronemotor neurone

1 and 2 only.I and 3 only.2 and 3 only.1 . 2 a n d 3 .

* - \

The diagram below shows a cross section of the spinal cord. At which part(s) of the spinal cord cansynapses be found?

AB .

kD.

John has some problems in his nervous system. When he is blindfolded and the finger of his left hand ispricked with a needle, he cannot feel the pain and does not withdraw his hand. However, he can move hisleft arm voluntarily. Which of the following components of the corresponding reflex arc is / are probablydamaged?

A.g--

€-*

-.t 'fi"hl,/

motor and sensory neurones

,y The photograph below shows part of the human central nervous system.

?ifx

The movement of the legs is under the coordination of

fC.D.

2007-cE-Bro 2-8

l f \trA

Directions.' Questions 29 and 30 refer to the experimental set-up below, which was used to compare the rate ofrespiration of two different types of insects. Insects of the same mass were placed into the test tubes.

clip

insect A

perforatedplatform

sodium hydroxidesolution

Ah

r€.

D.

U-tube filled withcoloured water

insect B

water bath at 25"C

sodium hydroxidesolution

The movement of coloured water in the U-tube is caused bv the . ,h, - rl + .>;-[ / t I

-*;:,

Which of the following modifications can shorten the time for the experiment?

A. heat released/B. food consumedrC. oxygen absorbed.D. carbon dioxide released.oA

Capillaries beneath the skinless blood flowr'more blood flowless blood flowmore blood flow /

V

use a larger test tubeuse a larger water bathuse a U-tube with a larger internal diameteruse a water bath set at a higher temperature

3/ . Which of the following statements about chromosomes are conect?

lt is made up of DNA and proteins.TIt plays a role in protein synthesis.wIt is capable of replication. /

A. (l) and (2) onlyB. (1) and (3) onlyrC. (2) and (3) onlyTD. (l), (2) and (3) r'

Which of the following are the changes found in the skin when there is a sudden drop in environmentaltemperature from 25"C to lO"C?

A./B /

€*tr

( l )(2)(3)

Sweatingdecreasedecreaseincreaseincrease

2007-cE-Bto 2-9

Directions: Questions 33 and 34 refer to the diagram below, which shows the skeleton and the associated

muscles of a human upper limb.

Which of the following correctly describes joint X?

A.6.C.d

aA.D.C.+

The ends of the bones at X are ball-shaped.The degree of movement at X increases with age.

i

&=9 . /

&.+,

r A genetically modified rice is being developed so as to increase its harvest. This can be achieved by theinsertion of a gene that can produce

shel

Dietary fibre and calcium in diet are important to primary school students because

(l) fbod rich in calcium can help the formation and growth of bones andteeth. /(2) food with a high fibre content can reduce the risk of heart diseases.C-(3) food with a high fibre content can give a sense of fullness and help avoid over-eating."/

A. (l) and (2) onlyB. (l) and (3) onlyC. (2) and (3) onlyD. (1), (2) and (3)

END OF SECTION A

X is surrounded by ligaments to reduce the chance of dislocation. /X is a hinge joint because it allows the upper limb to move in a single pla#.

Which of the following is a correct description of structure Y?

Propertyelasticinelasticrich in proteinrich in glucose

vitamin A.a human protein.a toxin to kill pests.a substance to lengthen the

Importance during movementallows the attached bones to move more freelytransmits forces to bone with minimum losscreates a smooth surface to reduce frictionreleases more energy for muscle contraction

f life.

2007-cE-Bro 2-10 l 0

SECTION B

Directions: Questions 37 to 39 refer to the diagram below, which shows a simplified nitrogen cycle.

Nitrogen in air

U \Nitrogen in soil Nitrogen in plants

\ -/tNitrogen in animals

Process 4decompositiondenitrificationdecompositiondenitrification

1,2 and 3 only.1,2 and 4 onlyJ i1,3 and 4 only,/, /2,3 and 4 only{ V

( l )(2)(3)

A.B .c.D.

N.I

#A&

2007-CE-BIO 2-11

amino acids../nucleic acids.urea. {

(l) and (2) only(l) and (3) only(2) and (3) only(l), (2) and (3)

l l

Which of the following correctly identifies processes 2 and 4?

Process 2nitrificationnitrogen fixationnitrogen fixationnitrification

Microorganisms play an important role in the processes

?C.L

AB.Ld,

r Nitrogen can be found in animals as a component of

What may happen if we overfeed the plant with the fertilizer?

Water is drawn out of the roots and there will not be enough water for the plant.The roots grow so fast that they will use up the oxygen in soil air.The roots absorb too much salt and retain too much water.The leaves become so large that they will overlap with one another.

The following shows a label of a chemical fertilizer.

4t/L

The blood volume returning to the heart increases.The rate of anaerobic respiration in the exercising muscles increases.The rate of aerobic respiration in the exercising muscles remains unchanged.

A. (1) and (2) only",B. (l) and (3) only fr /C. (2) and (3) only./ il , 2D. (l), (2) and (3),/ '�

^/

Condition A.h still air* air temperature l5oC,g- relative humidity 98%D. 0.03o/o carbon dioxide in air

passengers travelling on long-distance flights often experience the swelling of the feet. They are advisedto stretch their legs more often during the flight because stretching legs helps to

squeeze the arterioles and hence more blood flows away from the legs.squeeze the lymph vessels and hence more lymph flows away from the legs. /increase the heartbeat rate and hence more blood flows away from the legs. /increase the blood pressure and hence more lymph flows away from the legs. y'

&B.AD.

/

I

Condition Bmoving airair temperature 25"Crelative humidity 75%0.01% carbon dioxide in air

f

The film of water on the surface of human air sacs serves to

warm the incoming air.moisten the incoming air.trap dust in the inhaled air.dissolve the gases in the inhaled air.

When a person is running an 800m race, which of the following changes will happen in this body?

,A*B1--&D.

n[@/(3)

Mikonia microntha (ffitrffi) is a plant that grows rapidly on the neighbouring plants, thus reducing the

amount of light that reaches them. Its relationship with the neighbouring plants is

d. competition.& mutualism.C. parasitism.&= predation.

The graph below shows the transpiration rates of the same plant put under two different environmental

conditions.

Rate oftranspiration

Condition A Condition B

Which of the following is an unlikely combination of the conditions being studied?

2007-cB-Blo 2-12 t 2

Directions:

{

( l ) only*,(2) only.A(l) and (3) only.(2) and (3) onlyT

Questions 46 and 47 refer to the diagramthe root and the leaf of a herbaceous plant:

below, which shows a diagrammatic representation of

II

P

of carbon dioxide diffrrsion between the plant and the surroundings under bright daylight is

- ' , {

4(. The direction/ indicated by

{

#;

f

Which cell type(s) is / are important for supporting the plant?

A . Y o n l y / rB. P and Q only /C . Q a n d R o n l y , lD . P , Q a n d R \

A long-sighted person is wearing a pair of glasses in order to correct the eye defect. Which of thefollowing ray diagrams represents this situation?

/

d

ru .#:;"] eaf

2007-cB-Bro 2-13 t3

Directions: Questions 49 and 50 refer to the diagram below, which shows the structure of a nephron.

, - {

FWhich region of the nephron has cells with the greatest number of mitochondria?

A. 1B . 2

3 r L i4 u \ - ,

1 /

49.

C.D.

/Which regions are responsible for the reabsorption of water?

A. land2on lyB. I and 3 only /C. 2 and 3 only /D. 1,2 and 3 only Y

P, Q and R are triplets. The phenotypes of several traits found in them are listed below:

sl

Which of the following conclusions is correct?

A. P, Q and R are non-identical triplets.B. P and Q are identical twins but R is not. /C. P and R are identical twins but Q is not. /D. Q and R are identicaltwins but P is not. V

A couple, who have already had three children, decided not to have babies in the future. Which of thefollowing contraceptive measures is most reliable?

A. restricting sexual intercourse to safe py'iodsB. tying and cutting the oviducts /€, using a diaphragm V+ using a condom

Sex Blood srouD Eye colour tn&fght (ke)P Male o Blue 52a Male o Brown 52R Female o Brown 45

2007-cE-Bro 2-t4 l 4

Amniotic fluid cannol provide protection to the foetus against

"+.diC.

A

desiccation.mechanical injury.chemical poisoning.sudden change in temperature.

water is necessary for seed germination.oxygen is necessary for seed germination.soil is necessary for seed germination.light is necessary for seed germination.

I

I

II

&

I

perforatedplatform

Tube A

Based on the design of the set-up, the investigation is to test whether

.K:B .cD.-

Which of the followingtube A?

zT.

Total dry mass

3(

v

Tube B

chemical thatabsorbsoxygen

correctly shows the change in the total dry mass of the germinating seeds in

Total dry mass

Total dry mass [rorutdry mass

/'

Directions: Questions 54 and 55 refer to the diagram below, which shows a set-up used to investigate theconditions for seed germination. The tubes were kept at 30"C. The seeds in tube A germinatedwhile those in tube B did not.

aluminiumfoil

seed

moist cottonwool

Time Time

Time Time

2007-cE-Bro 2-15 l 5

Level of hepatitis A antigen in blood(arbitrarv unit)

Level of antibody against hepatitis A antigenin blood (arbitrarv unit)

* 0 0Y 0 2973, 300 3 5 1

Directions: Questions 56 and 57 refer to the table below, which shows the results of a blood test of threeindividuals. None of them have received any vaccinations related to hepatitis A before.

/;,{

Which individuals have contracted hepatitis A?

t X a n d Y o n l yE. Xand Zonly

9. YandZonly-fr:- X, Y andZ

,4-(57. Vaccination can confer protective effect to individual(s)

A. X only../E Z only.C . XandYon ly .Dr YandZonlv. I

Which of the following photomicrographs shows the full set of chromosomes in a body cell of a boy withabnormalities in his chromosomes?

4

1t i{li {f itd l

fr . ;J 1( rf i t Ji l t6 7 8 9 1 0 1 1 1 2

r t I l t i } t i l l r13 11 16 16 17 18

i { l { " r r r r } } rre 20 21 n, i ,

l) {f fi 1f irf r ?J 1{ r f i { J i T{8 7 8 9 1 0 1 1 1 2

J { l i I f } t l l } r13 11 t6 16 l r 18

13 t* .H ,; ]f

1 6

{ t t t\ ) 1 1' l r f

4 5

rr ) t J i t t9 1 0 1 1 1 2

) t : t l l16 17 18

' r : ' ; ) fx x

f r iJ 1{6 7 8

r { i l t {t3 11 15

{ ' { t r&r e i l

li {$ ilC.

t e t f\ 1 l i, T T i

4 6

rr J{ -{l it9 1 0 1 1 1 2

: t i t 1 l16 17 18

r i ? : \ r2 1 a , {

X Y

f lr iJ 1{6 7 8

. i { l l 1 {13 11 15

{ i | &18 zl

i} {f it

2007-cE-Bro 2-t6

Directions: Questions 59 and 60 refer to the diagram below, which shows a set-up designed by a student forinvestigating the growth response of coleoptiles:

aluminium foil covering partof the coleoptile

{ Y

€uni,atera,,ight

/ x Y5/ After a few days, the aluminium foil was removed. Which of the following diagrams shows the most' probable results of the investigation?

s . /

c . /

)6/ Which of the following set-ups would probably serve a similar aim as the student's investigation?I

A.metal cap

a P a

END OF PAPER

Sources of materials used in this paper will be acknowledged in the Examination Report and euestion paperspublished by the Hong Kong Examinations and Assessment Authority at a later stage.

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2007-cE-Bto 2-t7 t 7