5094-BiologySec 3 FE Latest]

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Name Class Index Number ANG MO KIO SECONDARY SCHOOL FINAL EXAMINATION 2007 SECONDARY THREE EXPRESS BIOLOGY 5094 Total Mark: 100 5 October 2007 / Friday Setters: Mrs Vedamoorthy 2 hours 30 minutes Additional Materials: OTAS Sheet, Writing Papers READ THESE INSTRUCTIONS FIRST Write your Name, Class and Index Number in the spaces at the top of this paper. You may use a soft pencil for any diagrams, graphs or rough working. You should show the essential steps in any calculations. Do not use staples, paper clips, highlighters, glue or correction fluid/tape. Section A Answer all the questions in Section A on the OTAS paper provided. Write your name, class and index number on the OTAS paper in the spaces provided. Use only 2B pencil on the OTAS paper. Section B Answer all the questions in Section B in the spaces provided on the question paper. Additional papers attached will not be marked. Section C Answer three questions. Questions 1 and 2 are compulsory. For the third question, choose either E or O. Write your answers on the writing paper provided. At the end of the examination, submit your answers for Sections B and C separately. Hand in your OTAS sheet separately.

Transcript of 5094-BiologySec 3 FE Latest]

Page 1: 5094-BiologySec 3 FE Latest]

Name Class Index Number

ANG MO KIO SECONDARY SCHOOL FINAL EXAMINATION 2007

SECONDARY THREE EXPRESS

BIOLOGY 5094

Total Mark: 100 5 October 2007 / Friday

Setters: Mrs Vedamoorthy 2 hours 30 minutes

Additional Materials: OTAS Sheet, Writing Papers

READ THESE INSTRUCTIONS FIRSTWrite your Name, Class and Index Number in the spaces at the top of this paper. You may use a soft pencil for any diagrams, graphs or rough working.You should show the essential steps in any calculations.Do not use staples, paper clips, highlighters, glue or correction fluid/tape.

Section AAnswer all the questions in Section A on the OTAS paper provided. Write your name, class and index number on the OTAS paper in the spaces provided. Use only 2B pencil on the OTAS paper.

Section BAnswer all the questions in Section B in the spaces provided on the question paper. Additional papers attached will not be marked.

Section CAnswer three questions. Questions 1 and 2 are compulsory. For the third question, choose either E or O. Write your answers on the writing paper provided.

At the end of the examination, submit your answers for Sections B and C separately. Hand in your OTAS sheet separately.

For Examiner’s use

Section A /30

Section B /40

Section C /30

TOTAL

This document consists of 25 printed pages, including the cover page.

[Turn over]

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SECTION A [30 Marks]

Answer all questions.

1 Which one of the following correctly describes the plant structure shown below?

Cell wall Nucleus Cytoplasm Lignin Chloroplasts

A

B

C

D

Present

Present

Absent

Present

Absent

Absent

Absent

Present

Absent

Absent

Absent

Present

Present

Absent

Present

Present

Absent

Absent

Absent

Present

2 The diagram below shows the structure of an unicellular organism called the

Euglena.

Shawn argued that it is an animal while Annie argued that it is a plant. Which

of the following are correct reasons why they arrived at their different

conclusions?

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It is an animal due to the It is a plant due to the

A

B

C

D

Presence of cell membrane.

Absence of cell wall.

Absence of motile cilia.

Presence of the nucleus.

Presence of flagellum.

Presence of chloroplasts.

Presence of contractile vacuole.

Presence of the photoreceptor.

3 The diagram below shows the female reproductive system.

Which level of organisation are the structures W, X, Y and Z?

Cell Tissue Organ Organ System

A W Y X Z

B X Z Y W

C Y X Z W

D Z W Y X

4 The diagram below shows a typical plant cell after it had been immersed in a

concentrated sugar solution for ten minutes.

Which one of the structure(s) is / are partially permeable?

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A 1 only

B 2 only

C 1 and 2 only

D 1 and 3 only

5 In an experiment, a marine unicellular organism was placed in a series of dilutions of

sea water. The output of its contractile vacuole (helps to expel excess water) and the

changes in its volume were measured and recorded. The data is presented in the

graph below.

Key: Contractile vacuole output

Body volume

Which of the following is a valid conclusion based on the graph presented?

A The activity of the contractile vacuole decreases with increased dilution of sea

water.

B At 20% sea water, the organism was isotonic to its environment.

C Lysis of the organism started to occur when the environment contained less

than 10% sea water.

D At low dilutions of sea water, the contractile vacuole was effective in expelling

water.

4

Contractile vacuole output (mm3 / sec)

Body volume(mm3)

% sea water

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6 Which substance enters the plant cells by active transport?

A Nitrate ions

B Water

C Carbon dioxide

D Oxygen

7 The diagram below shows an experiment set up to test the effect of protease enzyme on a photographic film with black coating.

Which test tube in the diagram below shows the best control for experiment?

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8 Many washing detergents contain enzymes to remove stains from clothes.

Which type of enzyme should be present in a detergent designed to remove

(a) blood stains and (b) grease?

9 Given a sample of unknown, which of the following steps would be needed to test

if proteins are present in the sample? (Note: shaded box indicates that the step is

essential)

Add

Benedict’s

solution

Add

copper(II)

sulphate

solution

Add

iodine

solution

Add

sodium

hydroxide

solution

Heat

A

B

C

D

10 Five disaccharides were each hydrolysed with dilute acid, and the purified products

were separated by chromatography. The result is shown in the diagram below.

(a) (b)

A

B

C

D

Carbohydrase

Protease

Amylase

Lipase

Pepsin

Lipase

Carbohydrase

Protease

6

sucrose

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If spot 1 represents the products obtained from the hydrolysis of sucrose, which one

of the following indicates the results obtained from the hydrolysis of lactose and

maltose.

Lactose Maltose

A 2 3

B 2 4

C 5 2

D 5 3

11 The diagram below shows part of the human digestive system.

What is the probable effect of removing part of the structure D?

A The person loses weight.

B The person loses appetite.

C The person suffers from diarrhoea.

D No faeces can be formed.

12 If structure C is removed, which of the following correctly describes the

consequence?

A Fatty food cannot be digested.

B Oil cannot be emulsified.

C Release of bile cannot be regulated.

D The person gains weight.

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13 The diagram below shows some food moving along the alimentary canal, by

peristalsis.

What are the muscles in the wall of the alimentary canal doing at point X?

circular muscles longitudinal muscles

A contracting contracting

B contracting relaxing

C relaxing contracting

D relaxing relaxing

14 The abundance of rennin in the alimentary canal of a baby enables it to

A digest all protein food easily.

B break down peptones to amino acids.

C turn milk into curds.

D break down lactose (milk sugar) to simple sugars.

15 The graph below shows the variation of rate of photosynthesis with carbon dioxide

concentrations.

Rate of photosynthesis

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Carbon dioxide concentrations

Which of the following deductions can be made from the data shown in the graph?

A Rate of photosynthesis varies directly with increase in carbon dioxide

concentration.

B Rate of photosynthesis varies directly with increase in light intensity.

C Rate of photosynthesis is unaffected by an increase in carbon dioxide

concentration at high light intensity.

D Rate of photosynthesis is dependent on light intensity at higher carbon

dioxide concentrations.

16 The following graph charts the rate of transpiration from the leaves of a

dicotyledonous plant.

When did the stomata of the plant begin to open?

17 Figure 1 and 2 show two views of the cells in a dicotyledonous leaf.

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Which labelled parts in the figure 1 are the same as those in figure 2?

P Q R

A

B

C

D

F

J

I

J

G

K

J

K

H

L

L

I

18 In manufacturing of protein, plants use chemicals which are absorbed from the soil

and other chemicals which are already present within the plant. Which of the following

combinations of chemicals is needed for the manufacture of proteins?

Chemicals absorbed from the soil Chemicals already present

within the plants

A Nitrates Glucose

B Nitrates Amino acids

C Amino acids Nitrates

D Carbon Nitrates

19 For questions 19 and 20 refer to the diagrams below which show that a ring of bark

was removed from a leafy branch and the depth of cut.

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What would be the difference in the development of the fruits labelled F1 and F2

several days after the ring had been cut?

A F2 became smaller because no more water was transported to it.

B F1 became bigger because it could receive enough water supply.

C F2 became bigger because it was nearer to the root region so that

more water was transported to it.

D There is no big difference in size between F1 and F2.

20 If the ring was cut a bit deeper as shown in the diagram below, what would happen to

the leaves labelled L1 and L2 after two days?

A Both leaves would die because none of them could get any water supply.

B Leaf L1 would become more healthy because it could continuously receive

food supply from the leaf above it.

C Leaf L2 would remain turgid because it could still receive water supply from

the root region.

D Leaf L1 would become dry because it could not receive food supply from the

food stored in the root region.

21 When the leafy shoot is placed in a solution of dye, which part becomes most heavily

stained?

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A Guard cells in leaves.

B Palisade cells in the leaves.

C Phloem cells in the stem.

D Xylem vessels in the stem.

22 The diagrams show transverse sections from the root and the stem of a plant.

Which tissues carry amino acids in solution?

Root Stem

A 1 3

B 1 4

C 2 3

D 2 4

23 The diagram shows the liver and its blood supply.

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What is the name of blood vessel X and which substance increases in concentration

in concentration between vessels W and X?

24 The diagram shows a capillary network, tissue cells and lymph vessel. Which

structure is a lymph vessel?

25 The diagram shows sections through the left side of the heart. In which

diagram are the valves shown correctly as open or closed during the pumping of

blood out of the heart by contraction of the ventricle?

Name Substance

A

B

C

D

Hepatic artery

Hepatic portal vein

Renal artery

Renal Vein

Carbon dioxide

Carbon dioxide

Oxygen

Oxygen

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26 A heartbeat consists of two sounds – the louder ‘lub’ sound and the softer ‘dub’

sound. What cause these two sounds?

‘lub’ sound ‘dub’ sound

A semi-lunar valves opening bicuspid and tricuspid valves opening

B bicuspid and tricuspid valves opening semi-lunar valves opening

C bicuspid and tricuspid valves closing semi-lunar valves closing

D semi-lunar valves closing bicuspid and tricuspid valves closing

27 Which is the path taken by air breathed out of the lungs?

A alveoli bronchi bronchioles trachea

B alveoli bronchioles bronchi trachea

C trachea bronchi bronchioles alveoli

D trachea bronchioles bronchi alveoli

28 The apparatus shown below, containing a fresh field mushroom, can be used to show

that non-green plants

A produce heat during respiration.

B require water for photosynthesis.

C produce carbon dioxide during respiration.

D require the mineral iron for healthy growth.

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29 The diagram below shows a section through the human thorax. Two sets of muscles

are labelled 1 and 2 and the thoracic cavity is labelled 3.

Which of the following occurs for the air to enter the lungs?

Muscles 1 Muscles 2 Volume of 3

A Relax Contract Increased

B Contract Contract Increased

C Contract Relax Reduced

D Relax Relax Increased

30 Which process, occurring in the human body, does not involve energy from

respiration?

A Contraction of heart muscles.

B Diffusion of oxygen from the alveoli into the blood.

C Digestion of bread.

D Maintaining a constant body temperature.

End of Section A

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Name: ……………………………………( ) Class: Sec. 3/………

Ang Mo Kio Secondary School 05 October 2007

Final Exam 2007 Friday

Secondary 3 Express

Biology

SECTION B [40marks]

Answer all questions.

1 A student carried out an investigation into the effects of different concentrations of sodium chloride solution on potato tissue. Six cubes, each measuring 2 cm × 2 cm × 2 cm, were cut from a large potato. The cubes were placed on filter paper, gently blotted dry and weighed. Two cubes were then placed in Petri dishes in each of three solutions as follows: 10% sodium chloride solution, 2% sodium chloride solution and distilled water. The potato cubes were left in the solution for 2 hours, then removed, blotted as before and weighed again. The results are shown in the table below.

Solution Initial mass of cubes in g

Final mass of cubes in g

Change inmass in g

Change inmass in g (%)

10 % sodium

chloride

10.7 9.8 –0.9 –8.41

2 % sodium

chloride

10.9 10.8

Distil water 11.3 13.0 +1.7 +15.04

(a) Why were the cubes gently blotted dry before weighing?

………………………………………………………………………………............... [1]

(b) Calculate the change in mass and percentage change in mass for the potato cubes in

2% sodium chloride solution. Write your answers in the appropriate boxes in the table. Show your working. [2]

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(c) Explain the difference between the changes in mass for potato cubes in distilled water

and in the 10% sodium chloride solution. [5]

.......................................................................................................................................

.......................................................................................................................................

.......................................................................................................................................

........................................................................................................................................

.......................................................................................................................................

.......................................................................................................................................

2 Sucrose can be digested to give glucose and fructose. This reaction is speeded up

by the enzyme sucrase.

sucrase Sucrose Glucose + Fructose

(a) A student carried out an investigation into the effects of increasing the concentration of the enzyme sucrase on the rate of this reaction.He kept the concentration of sucrose constant. He used six different concentrations of the enzyme (sucrase) and for each of these he measured the time taken for the sucrose to be completely digested. He carried out all the reactions at 40°C. The student’s results are shown in the table below.

Enzyme (sucrase) concentration (%) Time taken to digest the sucrose in seconds

0.10 950

0.25 600

0.50 470

1.00 290

1.50 225

2.00 160

(a)

(i) Plot a line of these results on the grid below. Join the points with straight lines. [3]

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I

(ii) Describe how increasing the concentration of the enzyme (sucrase) affected the time taken for the sucrose to be digested. [2]

…..................................................................................................................................

…..................................................................................................................................

(b) Describe one way that he could keep the temperature constant (at 40 °C) [1]

…………………………………………………………………………………….

…………………………………………………………………………………….

3 (a) The table below gives some of the components required in a balanced diet.

Complete the table in the next page to show a suitable source of the component and give one function for each component. [3]

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Component Source FunctionProtein

Lipid

Iron

(b) Humans also require vitamins as additional substances in their diet. Name one

vitamin and describe the symptoms associated with a diet lacking enough of this

vitamin. [1]

Name ...........................................................................................................................

Symptoms ................................................................................................................... (c) Some individuals may become so overweight that it adversely affects their health. This condition is known as obesity. Describe the dangers of being obese. [2]

……………………………………………………………………………………….. ..………………………………………………………………………………………

4 The diagram below shows the apparatus used by a student to measure water uptake by a leafy shoot. The rate of water uptake by the leafy shoot in different conditions was compared by measuring the distance moved by the air bubble in one minute.

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(a) (i) What is the name given to this type of apparatus? [1]

….…………………………………………………………………………………...

(ii) Name the process by which water is lost from the leaves of a plant. [1]

………………………………………………………………………………………..

(b) Give one precaution you should take when setting up this apparatus. [1]

……………………………………………………………………………………………….

……………………………………………………………………………………………….

………………………………………………………………………………………………..

(c) The student measured the distance moved by the bubble in one minute, with the shoot

in different conditions. The results are given in the table below.

Conditions Distance moved by bubble in mm

Normal conditions 20

Increased temperature 24

Increased humidity 15

Increased air speed 25

(i) Calculate how many centimetres you would expect the bubble to move in a five-minute period with increased air speed. Show your working. [2]

(ii) Explain the change in the rate of water loss as the air speed increased. [3]

…………………………………………………………………………………..

………………………………………………………………………………….

………………………………………………………………………………….

………………………………………………………………………………….

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5 Lemna (also known as duckweed) is a small floating plant, which grows in freshwater. An experiment was set up to investigate the role of mineral ions in the growth of Lemna. Five dishes (labelled A to E) were set up as shown in the diagram below. Each dish contained the same number of Lemna plants but in a different solution. Dish A contained ‘complete solution’, which included all the mineral ions required by Lemna for normal growth. Dishes B, C and D each lacked a different mineral ion. Dish E contained distilled water, which has no mineral ions.

The dishes were placed by a window in the classroom and observed over a period of three weeks. Growth of the Lemna plants was estimated from the changes in leaf size and number of leaves.

(a) Compared with dish A, Lemna plants in dish B showed less growth and their leaves turned yellow. Suggest an explanation for this result. [2]

.....................................................................................................................................

......................................................................................................................................

(b) Explain why all the dishes were placed by a window in the classroom. [2]

……………………………………………………………………………………………….

……………………………………………………………………………………………….

.

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6 The diagram below is a simplified plan of the human heart.

(a) Name the blood vessels labelled A, B, C, and D. [2]

A - ………………………………… C -………………………………….

B - ………………………………… D - …………………………………

(b) State one way that the blood in vessel B differs from the blood in vessel C. [1]

………………………………………………………………………………………..

………………………………………………………………………………………..

(c) When a person exercises for a short period of time, the heart responds to the increased level of activity. What is the heart’s response to exercise and how does it enable greater physical activity? [3]

.......................................................................................................................................

.......................................................................................................................................

.......................................................................................................................................

…………………………………………………………………………………………

(d) Some babies are born with a heart defect, in which there is a hole in the septum between the left and right ventricles. Suggest how this might affect the functioning

of the heart and the response of the body to exercise. [2]

………………………………………………………………………………………

……………………………………………………………………………………… End of Section B

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SECTION C [30 marks]

Questions 7 & 8 are compulsory questions. Question 9 is in the Either /Or format. Only one part of the question is to be answered.

Begin each question on a fresh page.

7 Gas exchange in a leaf can be affected by the environment conditions surrounding

the leaves. Explain how each of the following changes would affect the gases

passing into and out of the leaf.

(a) An increase in light intensity from dim light and bright light. [4]

(b) An increase in temperature during the day [4]

(c) List two structural features of the leaf which are adapted for efficient gaseous

exchange in and out of the leaf. [2]

8 Describe the mechanism by which carbon dioxide in the blood capillaries

around the alveoli passes into the alveoli and is exhaled from the lungs. [10]

9(E) Describe what would happen to a piece of meat from the time it is eaten to

the time its constituent molecules are absorbed into the bloodstream. [10]

9(O)

(a) What is meant by double circulation? [2]

(b) Explain the protection function of blood. [6]

(c) Show, by means of a table, how the red and white blood cells differ in

structure and function. [2]

End of Paper

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