Bio K 2 Percubaan Sbp 2007

SULIT 4551/2 Biologi Kertas 2 Ogos 2007 2

Nama:………………………………………………… 4551/2 1 Tingkatan:…………………………………………….

1 jam 2

SEKTOR SEKOLAH BERASRAMA PENUH BAHAGIAN SEKOLAH KEMENTERIAN PELAJARAN MALAYSIA PEPERIKSAAN PERCUBAAN SIJIL PELAJARAN MALAYSIA 2007

BIOLOGI Kertas 2 Dua jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU 1. Kertas soalan ini mengandungi tiga bahagian.

2.

3.

4.

5.

Bahagian A, Bahagian B dan Bahagian C. Jawab semua soalan dalam Bahagian A, satu soalan daripada Bahagian B dan satu soalan dari Bahagian C Jawapan kepada Bahagian A hendaklah ditulis dalam ruang jawapan yang disediakan dalam kertas soalan. Langkah penting dalam kerja mengira hendaklah ditunjukkan. Jawapan kepada Bahagian B dan Bahagian C hendaklah ditulis pada ruang jawapan yang disediakan. Anda diminta menjawab dengan lebih panjang untuk Bahagian B dan Bahagian C tetapi jawapan mestilah jelas dan logik. Dalam jawapan anda, persamaan, gambar rajah, jadual, graf dan cara lain yang sesuai untuk menjelaskan jawapan anda boleh digunakan. Jawapan kepada ketiga-tiga bahagian ini hendaklah diserahkan bersama-sama. Anda hendaklah menyerahkan kertas tulis dan kertas graf tambahan. Penggunaan kalkulator saintifik yang tidak boleh diprogramkan adalah dibenarkan.

Untuk Kegunaan Pemeriksa Marka Bahagia Markah Soalan h n dipeolehi penuh 1 13 2 12 A 3 12 4 12 5 11 6 20 B 7 20 8 20 C 9 20 Jumlah 100

Kertas soalan ini mengandungi 29 halaman bercetak 4551/2 @ 2007 Hak cipta Sektor Sekolah Berasrama Penuh 4551/2

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2 Section A [ 60 marks ] Answer all questions

e

1. Diagram 1.1 shows the relationship between a cell, chromosome, DNA, genes and bases

Cell

genes

DIAGRAM 1.1 a)

1(a)

On Diagram 1.1 , mark and label of the following terms : i) DNA ii) Bases iii) Chromosomes [3 marks]

b)

1(b)

State the chromosome number of the cell shown in Diagram 1.1 …………………………………………………………………… [ 1 mark ]

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3 c)

What can you deduce about genes based on Diagram 1.1 ? ………………………………………………………………………..

1 (c)

……………………………………………………………………….. ………………………………………………………………………. [ 1 mark ] d)

Diagram 1.2 represent parts of a molecule of DNA

A unit of DNA

K

A

T

G

DIAGRAM 1.2 1(d)(i) i)

Name a unit of DNA.

ii)

………………………………………………………………………….. [ 1 mark ] What is K ? 1 (d)(ii)

………………………………………………………………………… [ 1 mark ]

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e e

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4 iii)

Complete the Diagram 1.2 to show that DNA molecule consist two strands that joined together by hydrogen bond.

1 (d) (iii)

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[ 3 marks ]

e)

Diagram 1.3 shows the karyotype of a normal person and a person with Cri-du-Chat syndrome

Normal person

DIAGRAM 1.3 i)

Determine the sex of person with above karyotype. ………………………………………………………………………… [ 1 mark ]

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1(e)(i)

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ii)

Based on the Diagram 1.3, explain why Cri-du-chat syndrome occur ?

1(e) (ii)

…………………………………………………………………………. ………………………………………………………………………… [2 marks ] TOTAL

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2. Diagram 2 shows a cross section of a leaf .

P

Q

Stoma

DIAGRAM 2

2(a)(i)

(a) (i) Name the structure labelled Q. ………………………………………………………………………………………….. [1 mark ] (ii) State two tissues that form the structure named in (a)(i) 1. ………………………………………………………………………………………. 2. ………………………………………………………………………………………. [2 marks]

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2(a)(ii)

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(b) Explain how the structure labelled P in Diagram 2 is adapted for optimal photosynthesis.

e

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

2(b)

……………………………………………………………………………. ……………………………………………………………………………. [ 3 marks ]

In different habitats, plants have different distribution of stomata and chloroplasts.

( c ) Explain how the above statement enables the following plants to carry photosynthesis at an optimum rate.

out

i) Aquatic plants …………………………………………………………………………………….

2 (c)(i)

……………………………………………………………………………………. ……………………………………………………………………………………. [2 marks] ii) Desert plants ……………………………………………………………………………………. ……………………………………………………………………………………. …………………………………………………………………………………….. [ 2 marks ]

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2(c)(ii

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d) Explain the important of green plant to living organism. ………………………………………………………………………………………..

2(d)

……………………………………………………………………………………….. ……………………………………………………………………………………….. [ 2 marks ] TOTAL

3.

A man has the free earlobe as shown in Diagram 3.1, married to woman with same type of earlobe as shown in Diagram 3.2.

DIAGRAM 3.1

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DIAGRAM 3.2

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Their children P, Q, R, S, T, and V have trait, as shown in Diagram 3.3

P – girl

Q - boy

R – girl

S – boy

T- boy

V – girl

Attached earlobe DIAGRAM 3.3 (a)

Based on the Diagram 3.3 which of the earlobe trait is dominant ? Explain your answer. 3(a) ……………………………………………………………………………. ……………………………………………………………………………. [2 marks]

(b)

Explain whether the trait is inherited as sex- linkage inheritance? ……………………………………………………………………………. ……………………………………………………………………………. [2 marks]

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3(b)

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(c) If ‘E’ is a dominant allele for earlobe trait, and ‘e’ is recessive allele, draw a schematic diagram this inheritance of earlobe trait.

[5marks]

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3(c)

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3(c)(i) (c)

(i)

What type of variation shows in earlobe inheritance?

…………………………………………………………………………… [ 1 mark ] (ii)

State how this type of variation is caused

…………………………………………………………………………….

3(i)(ii)

……………………………………………………………………………. ……………………………………………………………………………. [1 mark] (d)

Diagram 3.4 shows a species of moth in industrial area. The original moth is white .

3(d)

DIAGRAM 3.4 Based on the diagram define what is mutation? ……………………………………………………………………………………. ……………………………………………………………………………………. [ 1 mark]

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TOTAL

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4. Diagram 4.1 shows a part of the circulatory system in human. To heart From heart

P

Q

Blood capillaries

From heart

DIAGRAM 4.1

4(a)

a) What happens to the blood pressure as the blood flow from P to Q ? …………………………………………………………………………………………. [ 1 mark ] b) Explain why is important for P to have thick wall. P

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

capillaries

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4(b)

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c) Explain how nearby muscle at Q prevent the back flow of blood.

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4(c )

…………………………………………………………………………………………. …………………………………………………………………………………………. ......................................................................................................................................... [ 2 marks ] d) Explain how the structure of capillaries allow substances to pass from them to the surrounding efficiently.

4(d)

………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… [ 3 marks ]

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e) (i) Sketch graph to show average blood pressure at P, capillaries, Q in Diagram 4.2 [ 1 mark]

For examiner’s use

4(e)(i)

Blood pressure

P

capillaries

Q

Position in circulatory system DIAGRAM 4.2 e (ii) Our normal blood pressure is 120/80 mmHg. Explain what the figure represent.

4 (e) (ii)

…………………………………………………………………………………. …………………………………………………………………………………. …………………………………………………………………………………. [ 3 marks]

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In natural ecosystems, there is competition between members of the same species as well as between different species.

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a) Explain how competition between members of the same species helps to control population growth. ………………………………………………………………………………………

5(a)

……………………………………………………………………………………… ……………………………………………………………………………………… ……………………………………………………………………………………… [ 2 marks ] b) Crop plants must compete with weeds for the same resources. Farmers control weeds by spraying herbicides(weedkillers). State two factors that the crop plants and weed may compete for and explain the importance of each. Factor 1 : …………………………………………………………………………... Explanation : ……………………………………………………………………….. ……………………………………………………………………………………… [ 2 marks ] Factor 2 : ……………………………………………………………………………. Explanation : …………………………………………………………………………. ………………………………………………………………………………………… [ 2 marks]

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5(b)

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c) Two species of the flour beetle, compete with each other for flour. Both are parasitized by a protozoan .The graph in Diagram 5 show the changes in numbers of the two species over 900 days when a parasite is absent and when it is present.

DIAGRAM 5 i)

Which species is the most successful when the parasite is absent ? Explain your answer. ……………………………………………………………………………. ……………………………………………………………………………. …………………………………………………………………………….. …………………………………………………………………………….. [ 3 marks ]

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5(c )(i)

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ii) Explain the effect of the parasite on the relative success of the two beetles.

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………………………………………………………………………………. ………………………………………………………………………………. ………………………………………………………………………………. ……………………………………………………………………………… [ 2 marks ]

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5 (c) (ii)

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Section B [ 20 marks ] Answer any one question 6.

Diagram 6.1 shows parent cells undergoing cell division.

Cell division

DIAGRAM 6.1 a) Based on the Diagram 6.1 i) What is the process shown ? State the significant of the process. [ 4 marks ] ii) Draw and explain the phases involved to produce daughter cells . [ 10 marks ]

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b) Diagram 6.2 shows a group of cells that is exposed to ultraviolet ray.

DIAGRAM 6.2 The exposure drives the cell cycle malfunctions. Based on the Diagram 6.2 describe effect of cell cycle malfunctions to the body. [ 6 marks]

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7. Diagram 7 shows the development of a human zygote.

Fallopian Tube

two cells stage

Q P

DIAGRAM 7 a) Describe the processes from P to Q . [ 4 marks ] b) Pregnant women are advised not to smoke and avoid from drugs and alcohol.

Explain the above statement in terms of the development of foetus. [ 6 marks]

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c) The fallopian tubes of a married woman are blocked, making it impossible for her to conceive through the natural process. She and her husband insist to have their own child . Explain one modern technique that can be used by the childless couple to conceive. Justify your choice. [ 10 marks ]

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Section C [ 20 marks ] Answer any one question. 8.

Diagram 8 shows the assimilation of digested food in the organ and body cell.

DIAGRAM 8 a ) Based on Diagram 8 , explain the assimilation of the following types of food ( i ) glucose ( ii ) amino acids ( iii ) lipids [ 10 marks ]

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b) Energy requirement for a girl aged 15 is 9000 kJ daily. Table 1 shows types of food, quantity and energy content of her daily menu. Types of food Rice Chips Roasted Chicken Grilled Beef Boiled potato Chocolate Yoghurt Egg

Quantity taken (g) 350 150 300 200 150 100 200 100 TABLE 1

Energy Content ( kJ /100 g ) 1500 1000 800 1200 500 2500 200 600

Calculate the total energy value taken by the girl daily . If she continues to take the menu everyday for a long time, explain the consequences of the habit to her health. [ 10 marks ]

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9.

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(a) Diagram 9 shows a ball and socket joint with tissues P, Q and R which are responsible for locomotion in a human.

DIAGRAM 9

Explain the role of the structures above in the

locomotion. [ 10 marks ] (b) Some drugs and steroids may have good effect as well as bad effect on nervous system and the activity of mucles. There are other alternatives instesd of consuming drugs and steroids which probably a better choice for sustaining good health of the muscles and nervous coordination over a long period of time. Justify the arguments above based on biological point of view. [10 marks]

END OF QUESTION PAPER

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