biosec4myep112.doc

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Class: Sec 4 / Register No. Name:

Pasir Ris Crest Secondary School

Mid Year Examination

Secondary Four Express

Biology Paper 1 10 May 2012

Duration: 1hour

Additional Materials: OTAS

INSTRUCTIONS TO CANDIDATES

Do not open this booklet until you are told to do so.

INSTRUCTIONS TO CANDIDATES

Do not open this booklet until you are told to do so.

Write your name, register number and class in the spaces at the top of this page.

There are forty questions in this paper. Answer all questions. For each question, there are

four possible answers A, B, C and D.

Choose the one you consider correct and record your choice in soft pencil on the OTAS.

Each correct answer will be awarded one mark.Any rough working should be done in this booklet.

This question paper consists of 18 printed pages including this cover page.

[Turn over.

1

For Examiner’s

Use Only.

Total / 40



What are the functions of W, X, Y and Z?

W X Y Z

A Synthesis of

polypeptides

Modifications

and packing of

proteins for secretion

Release energy

in respiration

secretion of

proteins out of

the cell

B Synthesis of polypeptides

Synthesis of steroids

Release energyin respiration

secretion of enzymes out of

the cell

C Synthesis of

steroids

Synthesis of

polypeptides

Secretion of

enzymes out of the cell

Release energy

in respiration

D Release energy

in respiration

Modifications

and packing of

proteins for secretion

Secretion of

enzymes out of

the cell

Synthesis of

polypeptides

4. An experiment is set up as shown below. The water outside the visking tubing is

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tested for starch and sugar at the beginning and 30 minutes later. The results

obtained are shown in the table below.

Reagent Water tested

immediately

Water tested 30 minutes

laterBenedict’ssolution

Blue solution Orange-red precipitate

Iodine

solution

Brown solution Brown solution

Which of the following conclusion(s) can be drawn from this experiment?

i) The Visking tubing is partially permeable.ii) Saliva can diffuse through the Visking tubing.

iii) Saliva converts starch to a reducing sugar.

iv) Starch molecules can diffuse through the Visking tubing.

A i only

B i and iii only

C i, ii and iii onlyD ii and iv only

5. Some plant cells, containing a red pigment, are placed in a solution withthe same water potential as its cell sap. The solution remains colourless after 30

minutes. When the solution is warmed gradually, the solution becomes red.

Which statement explains this?

A The pigment molecules gain enough energy and diffuse out of the cells.

B The pigment becomes more soluble with increase in temperature

C The cell membrane ruptures.D The cell walls burst.

6. A packet of food contains the nutrients sucrose and fats. Which of the following

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shows the correct results when food tests are conducted?

Biuret Test Benedict’s Test Fat Emulsion Test

A Blue mixture Blue mixture White emulsion

B Blue mixture Orange precipitate Clear emulsion

C Purple mixture Orange precipitate Clear mixture

D Purple mixture Blue mixture Clear mixture

7. The diagram shows one example of enzyme action as demonstrated by the ‘Lock and

Key’ hypothesis.

From the diagram, which of the above X, Y or Z represents the substrate?

A X

B Y

C ZD Y and Z

8. The diagrams represent an enzyme molecule and its substrate. Which diagramshows these molecules after they are heated to 80oC?

A

B

C

5



D

9. The diagram shows certain organs in the abdomen.

Where is bile active?

10. Why does emphysema cause severe breathlessness?

A The alveoli are coated with tar.

B Excessive mucus is produced.

C Lumps block diffusion of gases.D Surface area : volume ratio for gaseous exchange is reduced.

11. Refer to the diagram below for question 11 and 12.

An experiment was carried out to measure the grasshopper’s rate of respiration.

6

A

C

B

D



The rise in the level of coloured liquid after 30 minutes indicates that the __________________ .

A Grasshopper is taking in oxygenB Sodium hydroxide is absorbing oxygen

C Grasshopper is giving out carbon dioxide

D Sodium hydroxide is releasing carbon dioxide

12. After 30 minutes, the coloured liquid was returned to its original level by

depressing the syringe plunger from X to Y.

It can be concluded that, the grasshopper’s rate of respiration is …………..

A 0.2ml/h

B 0.4 ml/hC 0.8 ml.h

D 1.0 ml/h

13. Which diagram shows the most efficient respiratory surface?

A

7

blood capillary

alveolus



B

C

D

14. Which of the following events will lead to an increase in the pressure in the

thoracic cavity?

15. The diagram below shows part of a tissue. The arrows show the movement of

fluids. At which point is the pressure the highest?

diaphragm external intercostal

muscleA. contract contract

B. contract relax

C. relax relax

D. relax contract

8

lymph vessel



16. What is the type of blood vessel found at X?

A Artery

B Ateriole

C VenuleD Vein

17. The graph below shows changes in the pressure of the left side of the heart during a singleheartbeat.

Between points W and X are the following valves open or closed?

9

capillary

tissue cellscapillary

AB

X

Not drawn to scale



Atrio-ventricular valves Semi-lunar valves

A closed open

B closed closed

C open open

D open closed

18. The picture below shows the blood capillaries of a normal person and a person

suffering from sickle cell anaemia.

Which of the following are likely consequences of having sickle cell anaemia?

i Oxygen deprivation by cells and tissues due to obstruction of bloodflow.

10

time/s

pressure/kPa

X

W

pressure in atrium

pressure in ventricle

pressure in aorta

Blood vessel

Sickle cell

Normal red blood

cell



ii Pale looking

iii The heart got to work harder to pump blood.iv Blood transfusion may be necessary.

A i and ii onlyB i, ii and iii only

C i, ii and iv only

D All of the above

19. The active ingredient in a pesticide inhibits the synthesis of the plasma protein

prothrombin in the liver. The pesticide mostly kills the pest by__________.

A slowing the clotting process after internal bleeding

B causing the accumulation of urea in the blood

C preventing the regulation of blood glucose levelD stimulating the breakdown of red blood cells

20. Which of the following is an example of excretion?

A The release of insulin from the pancreas.B The release of urea from the liver.

C The removal of carbon dioxide from the lungs.

D The removal of faeces from the digestive system.

21. The graph shows temperature changes in a healthy person’s body.

At which time A, B, C or D would the person shiver?

22. The diagram below shows the kidney and three blood vessels associated with it.

Where will urea be found in the highest concentration?

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A Z only

B X and YC X aand Z

D X, Y and Z

23. A person walks into an air conditioned room. Shortly afterwards the hairs on

their hairs on their skin are raised.

Which labelled structure is included in the first stage of this reflex?

24. Which of the following is the response by the body when a large volume of

water is drank in a short period of time?

12

A

B

C

D

to vena cavaX

from aorta

Y

Z

to bladder



Endocrine gland Hormone Response by

kidney tubule

Urine formed

A Hypothalamus More ADH Less permeable Diluted

B Hypothalamus Less ADH More permeable Diluted

C Pituitary gland More ADH Less permeable Diluted

D Pituitary gland Less ADH Less permeable Diluted

25. A child frightened by a loud noise, ran towards his mother. Which gland helps in

this response?

A PancreasB Hypothalamus

C Adrenal gland

D Pituitary gland

26. Which of the following describes how the body is cooled down during

sweating?

A sweat glands secrete sweat onto the surface of the skin

B sweat on the skin surface absorbs heatC sweat wiped off from the skin surfaceD sweat evaporates from the skin surface

27. The diagram below shows the front part of the eye.

Which changes take place in the eye when a person looks up from reading a

book to look at an approaching bus.

Ciliary muscle Suspensory ligaments Lens

A contract taut thin

B contract slacken thick

13

Ciliary muscle

Suspensory

ligaments

Lens



C relax taut thin

D relax slacken thick

28. In which of the labelled structures below does the pollen tube starts to develop?

29. Which part of the pea flower should a farmer remove to prevent self-pollinationof his pea plants?

A anthers

B stigmaC petals

D ovule

30. An experiment was set up using four groups of insect-pollinated flowers in afield. In each group different parts of the flowers were removed, as shown in the

table below,

and insects were allowed to visit all the flowers freely.Which group of flowers, A, B, C or D, would produce the most seeds?

Group

of

flowers

Stigma Anthers Petals

A. Remain Removed RemainB. Remain Remain Remain

C. Removed Remain Removed

D. Removed Removed Remain

14

B

A

C

D



31. The diagram shows a side view of the structures in the lower abdomen of awoman. In which region will fertilisation and implantation occur?

32. Vasectomy is a permanent male sterilisation method. In this minor surgery,some tubes are tied and cut in the male reproductive system. This prevents themale gametes from leaving the body of the man.

At which point does the surgeon make the cut in the diagram below?

Fertilisation Implantation

A 2 1

B 4 1

C 4 2D 5 1

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AB



33. The diagram below shows a fetus developing in a uterus.Which structures remove excretory products from the fetus?

A P and QB Q and R

C R and S

D S and P

34. When is the sex of the baby determined?

A During ovulation

B After a few mitotic divisions in the embryoC At the moment of fertilisation

D When the embryo is implanted

35. Which of the following about HIV is true?

I. HIV infection will result in AIDs in a few days.

II. The use of contraception will reduce the risk of HIV infectionIII. HIV attacks the white blood cells

IV. Placenta acts as a barrier to prevent HIV from entering the bloodstream of

the fetus.

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R

Q

P

S

D

C



V. Sharing drinks and toilet seats with a HIV infected increases the risk of HIV

infection.A III only

B I and III only

C II and III onlyD All of the above

36. A variety of turtles has an inherited condition that affects the thickness of the

shells.SxSx have thick shells

SxSm have brittle and thin shells

SmSm do not survive

Two heterozygous turtles are mated.

What is the probability that a turtle of the next generation is a heterozygote?A 0

B 0.25

C 0.50D 0.67

37. A man has a recessive gene on all his X chromosomes. What is the probability of

this gene being present to his first daughter?A 25%

B 50%

C 75%D 100%

38. In peas, the alleles S, for smooth seeds is dominant over s for wrinkled seeds.

400 heterozygous plants were self-pollinated and 1500 smooth seeds werecollected. How many wrinkled seeds were collected?

A 6000

B 500C 375

D 100

39. Variations which can be inherited may arise from two identical pure breeding

parents as a result of

A improved culture techniquesB new pruning methods

C natural mutationsD natural selections

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40. Which of the following shows the correct arrangement for the component in a

nucleotide?

A

B

C

D

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