SPM Biology 2016

Question

3 .  Plasma membrane is important to control the exchange of materials such as nutrients and water in and out of a cell. Diagram 3.1 shows components of the plasma membrane.

Membran plasma adalah penting untuk mengawal pertukaran bahan seperti nutrient dan air ke dalam dan ke luar sel. Rajah 3.1 menunjukkan komponen-komponen membrane plasma.

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(a) (i) Name P and Q.

Namakan P dan Q.

(ii) State the function of P and Q.

Nyatakan fungsi P dan Q.

(iii) Water molecules able to diffuse across P. Give your reason.

Molekul air boleh meresap merentasi P. Beri alas an anda.

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(b) State two differences of transport processes which occur at Q and R.

Nyatakan dua perbezaan proses pengangkutan yang berlaku pada Q dan R.

 

(c) Diagram 3.2 shows steps in preparing a homemade crispy potato chips. In your opinion, explain which step is important to produce potato chips that are crispy.

Rajah 3.2 menunjukkan kaedah penyediaan kepingan kentang rangup buatan sendiri. Pada pendapat anda, terangkan Langkah yang manakah penting untuk menghasilkan kepingan kentang rangup.

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(d) A housewife uses coconut husk to plant an orchid as in Diagram 3.3. Why coconut husk is used to plant the orchid?

Seorang suri rumah menggunakan sabut kelapa untuk menanam pokok orkid seperti ditunjukkan pada Rajah 3.3. Mengapakah sabut kelapa digunakan untuk menanam pokok orkid itu?

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Answer ( 1 )

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    2021-01-06T11:42:50+08:00

    3.a)i) P: phospholipid

    Q: pore protein

     

    ii)P: phospholipids form a bilayer which makes up the semi-permeable plasma membrane.

    Q: a transport protein that is always open to allow small substances to move in and out of the cell

    iii) Water molecules are tiny molecules that can freely diffuse.

     

    b)

    Q (pore protein) R (carrier protein)
    Has an open channel that allows small, dissolved substances, ions to pass through.  Is specific, has binding site which can only bind to specific molecules.
    Transports only water soluble molecules like ions Transport water soluble and water insoluble substances

     

    c) -Soaking the sliced potatoes in concentrated salt solution is important to produce crispy chips.

    -The salt solution is hypertonic to the cells. Water diffuses out of the cells through osmosis.

    -This reduces the water content in the cells and they become crispy after frying.

     

    d)-coconut husks are environmentally friendly, the housewife doesn’t have to purchase new plant pots.

    -coconut husks are able to retain water keeping the soil moist for the plant to grow. The housewife doesn’t have to constantly water the plant.

    -coconut husks provide great aeration for plant roots.

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