SCIENCE FORM 5 FIRST TERM 2012

SCIENCE FORM 4 PAP 1 2015ANSWER SCHEME

SECTION A [20 MARKS]

NoAnswerMarks

1(a)1

(b) LoopGelung

1

(c)

2

(d)Discontinuous variationVariasi tak selenjar1

Total5

2(a)Ammonium chlorideAmmonia kloridaCalcium sulphateKalsium sulfatIodineIodin

2

(b)Sublimation / Pemejalwapan1

(c)Solid Gas SolidPepejal Gas Pepejal1

(d)Water has 3 states: solid, gas and liquid. While substance Q only has 2 states: solid and gas.Air mempunyai tiga keadaan: pepejal, cecair, dan gas. Sementara bahan Q hanya menunjukkan dua keadaan, iaitu pepejal dan gas.1

Total5

3(a)U: ElectronV: Neutron2

(b)Proton number: 5Nucleon number: 112

(c)Isotopes are atoms of the same element which have the same number of protons but different numbers of neutrons.1

5

4(a)(i)Neurone A: Sensory neuroneNeuron A: Neuron deria

1

(a)(ii)Neurone B: Motor neuroneNeuron B: Neuron motor1

(b)X = axonX = akson

1

(c)X transmits impulses from the cell body to an effector. i.e : A muscle or a glandX menghantar impuls daripada sel badan kepada efektor. Contoh: otot atau kelenjar

1

(d)Receptor sensory neurone (neurone A) central nervous system motor neurone (neurone B) effector.Reseptor neuron deria (neuron A) sistem saraf pusat neuron motor (neuron B) efektor.1

Total5

SECTION B [30 MARKS]

5(a)W: Pituitary gland/ Kelenjar pituitariX: Adrenal gland / Kelenjar adrenal2

(b)Prepares the body for emergency by: Increasing the metabolic rate Increasing the rate of heartbeat Diverting blood to vital organs Increasing the blood glucose concentration Causing the pupils to dilate1

(c)High blood sugar level in the blood (hyperglycemia) and urine (diabetes mellitus)Kepekatan gula tinggi dalam darah (hyperglycemia) dan air kencing (Penyakit Kencing Manis)1

(d)(i)Secretion of too much hormoneTerlalu banyak hormon dirembeskan1

(d)(ii)Thyroid glandKelenjar tiroid1

Total6

6(a)Chromosome mutationMutasi kromosom1

(b)Down syndrome Sindrom Down 1

(c)1. Radioactive substance/Chemical substanceBahan radioaktif/Bahan kimia2. High intensity ultraviolet rays Sinar ultraungu berketumpatan tinggi 2

(d) Turners syndromeSindrom Turner Downs syndromeSindrom down 2

Total6

7(a)P: Alkaline metalS: Noble gas2

(b)Element P is highly reactive.1

(c)i.Element R and element T1

(c)ii.They are in the same group.1

(d)It helps us to determine the physical properties of an element/ It is a systematic arrangement of the elements which makes it easy for us to study the elements.Ia membantu kita untuk menentukan sifat-sifat fizikal suatu unsur./ Ia adalah susunan unsur-unsur yang sistematik yang memudahkan kita untuk mengkaji unsur-unsur.1

Total6

8(a)i.Liebig condenserKondenser Liebig1

(a)ii.To condense gas into liquidUntuk mengkondensasikan gas kepada cecair1

(b)1

(c)To break the bubbles and prevent bumpingUntuk mengelakkan loncatan2

(d)DistillationPenyulingan1

6

9(a)

1

(b)All mice have black furSemua tikus mempunyai bulu hitam1

(c)1/4 or / atau25%1

(d)i.2

(d)ii.1:11

Total6

SECTION C[20 MARKS]

10(a)Water which has salt dissolved in it has a higher boiling point than distilled water.Air yang garam terlarut di dalamnya mempunyai takat didih yang lebih tinggi daripada air suling.

1

(b)(i) Aim of the experiment:Tujuan eksperimen:To study the boiling point of pure water and water which has impurities dissolved in it. Untuk mengkaji takat didih air tulen dan air yang mengandungi bendasing terlarut.

(ii) Identification of variables: Pengenalpastian pemboleh ubah: a. Constant variable: Volume of waterPemboleh ubah dimalarkan: Isi padu airb. Manipulated variable: Type of substance/ Type of solutionDistilled water and water with salt dissolved in itPemboleh ubah dimanipulasikan: Air suling dan air yang mengandungi garam terlarutc. Responding variable: Boiling point/Temperature of the boiling pointPemboleh ubah bergerak balas: Takat didih/Suhu takat didih

(iii) List of apparatus and materials:Senarai radas dan bahan:200 ml of distilled water, 200 ml of water with salt dissolved in it, beaker, Bunsen burner, tripod stand and thermometer 200 ml air suling, 200 ml air mengandungi garam terlarut, bikar, penunu Bunsen, tungku kaki tiga, dan termometer

(iv) Procedure or method:Prosedur atau kaedah:1. A beaker containing distilled water is placed on a tripod stand. 1mBikar mengandungi air suling diletakkan di atas tungku kaki tiga.2. The Bunsen burner is ignited and placed underneath the beaker.Penunu Bunsen dinyalakan dan diletakkan di bawah bikar.3. A thermometer is placed in the water. 1mTermometer diletakkan di dalam air.4. The boiling point of the distilled water is taken.(RV)1mTakat didih air suling diambil.5. Steps 1-4 are repeated by using water with salt dissolved in it. (MV)1mLangkah 1 4 diulang dengan air yang mengandungi garam terlarut.

(v) Tabulation of dataPenjadualan data

1

2

1

4

1

Total10

11(a)

4

(b) Identify three common characteristics: Two daughter cells are produced.// The daughter cells have the same genetic information as the parent cell.// The daughter cells have the same number of chromosomes as the parent cell. [3 m]

Another importance of mitosis is in asexual reproduction.

An non-example of the importance ofmitosis is the formation of gametes. [2 m]

State the concept of this type of cell division: Mitosis is the cell division which produces two daughter cells that have the same genetic information as the parent cell and the daughter cells have the same number of chromosomes as the parent cell. [1 m]

3

2

1

Total10

12(a)Properties: 1. Very strong, does not snap easily [1 mark]Cir-ciri: Sangat kuat, tidak mudah putus [1 markah]2. High density [1 mark]Ketumpatan tinggi [1 markah]Example: Iron and aluminium [2 marks]Contoh: Besi dan aluminium [2 markah]

4

(b)(i) Choose the stronger bridgePilih jambatan yang kuat

(ii) DiagramA / RajahA1. The bridge made of wood breaks easily if a heavy load moves on it.Jambatan dibuat daripada kayu mudah runtuh jika beban yang berat melaluinya.2. The straight shape makes the bridge less stable.Bentuk yang lurus menjadikan jambatan kurang stabil.3. No pillars to support the load which moves on itTiada tiang untuk menyokong beban yang melaluinya

Diagram B / Rajah B1. The bridge made of steel which is a hard material does not break easily when a heavy load moveson it.Jambatan yang dibuat daripada keluli yang kuat tidak mudah runtuh apabila beban yang beratmelaluinya.2. The arch shape makes the bridge more stable.Bentuk melengkung menjadikan jambatan lebih stabil.3. There are pillars to support the load when moves on it.Terdapat tiang-tiang untuk menyokong beban apabila melaluinya.

(iii) The best bridge is shown in DiagramB because it made up of steel.Jambatan yang paling baik ditunjukkan pada RajahB kerana jambatan itu dibuat daripada keluli.

(iv) The bridge is made of steel which is a hard material and does not break easily when a heavy load moves on it.Jambatan yang dibuat daripada keluli yang kuat dan tidak mudah runtuh apabila beban yang berat melaluinya.

1

3

1

1

Total10

2