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    PERFECT SCORE BIOLOGY 2011

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    BAHAGIAN SEKOLAH BERASRAMA PENUH DAN

    SEKOLAH KLUSTER

    KEMENTERIAN PELAJARAN MALAYSIA

    PERFECTSCORE

    BIOLOGY 2011Teachers Module

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    Paper 2 Section A:

    Structural Questions Marks Studentnotes

    1. Diagram 1.1 shows a somatic cell of an insect undergoing meiosis.

    Diagram 1.1(a) Label Q, R and S in Diagram 1.1.

    [3 marks] 3m

    (b) In the space below draw chromosome behaviour during metaphase Iand metaphase II.

    [2 marks]

    2m

    Metaphase IMetaphase II

    Q:Chromosome/chromatid

    R:Centromere

    S: Nuclearmembrane

    Process X

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    (c) Explain how the process X involves in producing variation in organisms.

    P1 - During prophase Meiosis 1, crossing over occurs betweenhomologous chromosomes

    P2 - resulting a new genetic combination.

    P3- It is also producing the exchange of genetic material betweenpaternal chromosome and maternal chromosome // betweenhomologous chromosomes.

    [3 marks]

    Any3=3m

    (d) Diagram 1.2 shows the formation of an ovum.

    (i) What are process M and N?

    M : Meiosis I

    N : meiosis II

    [2 marks]2m

    (ii) Describe the process that occurs if a sperm present at process N.P1: meiosis II completed // ovum form

    P2: (nucleus) ovum is fertilized by sperm nucleus

    P3 : zygote is form

    [2 marks]

    2m

    M

    N

    M

    N

    Primary oocyte (2n)

    Oogonium (2n)

    First polar bodySecondary oocyte

    Second polar body

    Diagram 1.2

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    2. Diagram 2 shows the digested food is being carried from small intestineto the liver and body cell.

    (a)(i) Name process X at the villus.

    Absorption[1 mark]

    1m

    (ii) Explain ONE adaptation of the villus for the process in (a)(i).

    F : Has thin wall//one cell thick wall

    E : Diffusion of nutrient occurs rapidly //

    F: Has network of blood capillary

    E : transport nutrient to body tissue

    1F=1m1E=1m

    Diagram 2

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    F : has lacteal //

    E : to absorb/ transport fatty acid/glycerol to body tissue

    F : numerous

    E : increase total surface area

    [2 marks](b) Vessel P and Q transport digested food from the villi to the liver and body

    cells respectively.

    Name vessel P and vessel Q.

    P :Hepatic portal vein

    Q: Lymphatic vessel[2 marks]

    1m

    1m

    (c) Explain what happens to the excessive amino acids in the liver?

    P1 : Excess amino acid is converted into urea

    P2 : process is called deamination

    [2 marks]

    1m

    1m

    (d) Digested food are used by the body cells for growth, to form complexcompounds or structural components.State how lipids, amino acid and glucose are used in the cell.

    Lipids:L1: is used to build up plasma membrane/phospolipid

    L2 : excess lipid is stored in adipose tissue

    L3 : is used as energy reserve in the body

    Amino acids:

    A1: Amino acids are used in protein synthesis

    A2 : to repair damage tissue

    A3: used in synthesis of enzyme/hormones/antibody

    Glucose:G1 : is used in cellular respiration/ is oxidized to release energy

    G2 : Glucose is stored as adipose tissue.

    [3 marks]

    L=1m

    A=1m

    G=1m

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    (e) Explain what will happen to a person if his liver receives insufficient insulinfrom the pancreas.

    P1 : Blood sugar level increases// Diabetes mellitus

    P2 : Excess glucose cannot be converted to glycogen

    [2 marks]

    1m

    1m

    3. Diagram 3 shows the structure of respiratory system in human.

    Diagram 3

    (a) Based on Diagram 3, explain one adaptation of alveolus for efficientgases exchange.F1 : one cell thickP1 : gas doesnt have far to diffuse //diffuse easily

    F2 : supply with network of blood capillary.P2 : to increase the diffusion // transportation of respiratory gases to/from all the body cells.

    F3 : large surface area // numerous number of alveoliP3 : increase the diffusion of respiratory gases

    F4 : inner surface of alveoli are moistP4 : oxygen dissolve in the film of water

    1F=1m1P=1m

    BronchusP

    Bloodcapillary

    Cells

    Alveolus

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    Any F with correspond P

    (b)(i) Name PTrachea 1m

    (b)(ii)Explain the role of P to prevent dirt and bacteria from entering thealveolus.

    F1 : secrete sticky fluid/mucusP1 : traps dirt / bacteria that are breathed in.

    F2 : cells in P have cilia / tiny hair-like structuresP2 : sweeping the mucus out towards the mouth.

    Any F with correspond P

    1F=1m1P=1m

    (c)(i) On Diagram 3, draw labeled arrow ( ) to show the direction of

    Blood flow (P1)

    Oxygen diffusion (P2)

    Carbon dioxide diffusion (P3)[3 marks]

    Blood flow= arrow from blood capillary to other side of bloodcapillary

    Oxygen diffusion = arrow from alveolus to blood capillary// arrow from blood capillary to cells

    Carbon dioxide diffusion = arrow from blood capillary to alveolus// from cells to blood capillary

    P1=1m

    P2 =1m

    P3 = 1m

    (c)(ii) Explain why the diffusion of oxygen occur at the alveolus.

    F: the partial pressure of oxygen in the air of the alveoli is highercompared to the partial pressure of oxygen in the blood capillary

    P: ( therefore,) oxygen diffuses across the surface of the alveolus tothe blood.

    1m

    1m

    (d) A hard mass of food passing down the oesophagus might indirectlyinterrupt the air supply to lung by pressing on P.Explain how P overcome this problem.

    F : P/trachea is protected (against closure by a series of closelypacked C-shaped) ring of cartilage

    P : cartilage keep the trachea open// prevent from collapse

    1m

    1m

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    Structural Questions Marks Studentnotes

    4. Diagram 4.1 shows a cross section of a leaf..

    Diagram 4.1

    (a)(i) On Diagram 4.1 label the structures P and Q.

    P : Xylem

    Q : Phloem

    [2 marks]

    1m

    1m

    (a)(ii) Explain the stage of cell organization of the leaf .

    F : Organ

    E: made up of ground tissue, epidermal tissue, mesophyll tissueand vascular tissue // consists of various types of tissuescombined together to perform spesific functions.

    [2 marks]

    1m

    1m

    (b)(i) Q are important structure in plant transport system.Explain how structure Q in the leaf help in plant transportation.

    P1: Q / Phloem tissue composed of sieved tubes

    P2: with the end walls of each cell are perforated by pores to form

    sieves plates

    P3:which allow substances to pass from one cell to another.

    [2 marks]

    1m

    1m

    1m

    (b)(ii) Name the process occurs in (b)(i).

    Translocation[1 marks]

    1m

    P: ________________

    Q: _______________

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    Diagram 4.2 shows a longitudinal section of structure Q.

    (b)(iii) On Diagram 4.2 label the structures R and S.[2 marks]

    1m

    1m

    (c) R plays an important role in helping S in the plant transportation.Predict what happen to the plant if structure R is not presence ?

    P1: The plant will be dye

    P2: (without R / companion cell) no energy will be provided to thesieve tube

    P3:hence dissolve organic substances/sucrose/ cannot betransported (from leaves to the storage organ/other part ofplant)

    [2 marks]

    Any 2= 2m

    Diagram 4.3 (a) and 4.3 (b) shows a student removed the ring bark fromthe branch of a woody plant.

    S: Sieve tube cell

    R: Com anion

    Diagram 4.2

    Diagram 4.3(a) Diagram 4.3(b)

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    (d) Predict the effect of removing the ring bark from the branch.Explain your answer.

    P1: The branch will be die

    P2: owing to a lack of organic substances in the parts below the

    ring.

    [2 marks]

    1m

    1m

    5. Diagram 5 shows three types of neurones in the human body.

    (a) Name neurone P and neurone Q.

    Neurone P: Afferent neurone/ sensory neurone.

    Neurone Q: Interneurone

    [2 marks]

    1m

    1m

    (b)(i) Name structure X.

    Synapse[1 mark]

    1m

    (b)(ii) Explain how the transmission of nerve impulse across the X.

    P1 - When an impulses / electrical signals reaches in the axonterminal

    P2 - Stimulates (synaptic) vesicles to move towards (andbind with the presynaptic membrane)

    P3 - The vesicles fuse / release the neurotransmitter/ acetylcoline /example of neurotransmitter into the synapse / X.

    P4 - The neurotransmitter diffuses across the synapse / X

    P5 - This leads to the generation of new impulse/ electrical signalsin which travels along the Q / neurone

    [3 marks]

    Any 3=3m

    Diagram 5

    Q

    R

    X

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    (c) Describe the pathway in the reflex action involved the three neuronsabove.

    P1