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Biology · Oct / Nov 2024 · Paper 41 · Question 1

0610

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The question as text

Fig. 1.1 is a photomicrograph of a cross-section of part of a leaf. J K L M N Fig. 1.1

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  • 1(a)(i)[3]

    L ;

    N ;

    M ;

  • 1(a)(ii)[1]

    circle drawn around a vascular bundle ;

  • 1(a)(iii)[2]

    sucrose ;

    amino acids ;

  • 1(b)[3]

    any three from:

    thick walls ;

    containing lignin ;

    (lignin for) support (of vessel / tube) / AW ;

    no cell contents ;

    cells joined end to end / forming long continuous tube / no cross-walls ; to transport water ;

    AVP ;

  • 1(c)[4]

    any four from:

    (water enters) root hair cells, by osmosis ;

    through the (root) cortex (cells) ;

    to xylem (in the root) ;

    a column of water molecules moves up (the stem in xylem) / AW ;

    water molecules are held together by forces of attraction (between the molecules) / ref. to cohesion ;

    (water) diffuses / moves, out (of xylem in the leaf) into mesophyll

    cells ;

    (water) evaporates (from surface of mesophyll cells) into the air

    spaces ;

  • 1(d)[2]

    any two from:

    needed to make amino acids ;

    (amino acids) to make proteins ;

    (proteins) for growth ;

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