SPM BIology 2015

Question

4 . Diagram 4.1, 4.2 and 4.3 show the actions of three types of blood cells in human’s body defence mechanism.

Rajah 4.1, 4.2 dan 4.3 menunjukkan tindakan tiga jenis sel darah dalam mekanisme pertahanan badan manusia.

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(a) Name blood cells P and Q.

Namakan sel darah P dan sel darah Q.

 

(b)(i) Explain the importance of the action of blood cell P.

Terangkan kepentingan tindakan sel darah P.

(ii) Explain the action of blood cell Q on bacteria.

Terangkan tindakan sel sarah Q ke atas bakteria.

(iii) State the action of antibody on antigens in Diagram 4.3.

Nyatakan tindakan antibody ke atas antigen dalam Rajah 4.3.

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(c) Describe:

Huraikan:

(i) Statement X

Penyataan X

(ii) Statement Y

Penyataan Y

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Answer ( 1 )

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    2021-01-27T20:09:06+08:00

    4.a)P:platelets

    Q:white blood cell- phagocyte(neutrophil/monocyte)

     

    b)i)-for blood clotting. ensures there is no excessive blood loss.

    -clump together to form a plug and close up wounds.

    ii) -Q engulfs the bacteria using its pseudopodia.

    -a phagosome is formed. lysosome fuses with the phagosome, lysosome releases digestive enzymes (lysozymes) which breaks down the bacteria.

    iii)the antibodies bind the antigens to form clumps.

     

    c)i)Statement X:

    -Individual K has obtained naturally acquired active immunity.

    -This individual is able to produce antibodies which could fight off future infections from the same pathogen.

     

    ii)Statement Y:

    -Individual M has obtained artificially acquired passive immunity.

    -The individual is injected with a suspension which contains ready made antibodies which can specifically bind to the antigen.

    -However, this only provides short term immunity.

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