SPM Biology 2013

Question

5 . Diagram 5.1 shows the movement of water in a plant. Diagram 5.2 shows the cross-section of a leaf.

Rajah 5.1 menunjukkan pergerakan air dalam tumbuhan. Diagram 5.2 menunjukkan keratan rentas satu daun.

(a) M is a type of vascular tissue. Explain one adaptation of M in transporting water.

M ialah sejenis tisu vascular. Terangkan satu penyesuaian pada M dalam mengangkut air.

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(b)(i) Explain the importance of process K to the plant.

Terangkan kepentingan proses K kepada tumbuhan itu.

(ii) A tree is planted nearby a cement factory. Plenty of dust is released from the factory. Exlplain how this condition affects process K in the tree.

Sebatang pokok ditanam berdekatan kilang simen. Banyak habuk dibebaskan dari kilang itu. Terangkan bagaimana keadaan ini mempengaruhi proses K dalam poko itu.

 

(c) A plant is submerged in water during flood for a few days. Explain the effects of the occurrence to the respiration process of the plant.

Satu tumbuhan ditenggelami air semasa banjir selama beberapa hari. Terangkan kesan kejadian tersebut kepada proses respirasi tumbuhan itu.

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(d) State one difference in structure between cell L and spongy mesophyll cell.

Nyatakan satu perbezaan struktur antara sel L dengan sel mesofil berspan.

 

(e) Diagram 5.3 shows the structure of guard cells during day and night. Explain one difference in condition of the guard cells during day and night.

Rajah 5.3 menunjukkan struktur sel pengawal pada waktu siang dan waktu malam. Terangkan satu perbezaan keadaan sel pengawal pada waktu siang dan pada waktu malam.

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Answer ( 1 )

    1
    2021-02-27T03:06:28+08:00

    5.a) M is xylem tissue.

    -Xylem vessels are hollow and continuous allowing water to be transported from the roots straight up to the shoots.

     

    b)i)Process K is transpiration

    -Transpiration is important as it creates transpirational pull which pulls up water from xylem tissues in the roots to the leaves.

    -Thus it ensures that plant cells along the plant will obtain the water required.

    -It also helps to cool down the plant.

     

    ii)Dust covers the stomata on the leaves. If the stomata are blocked, the tree would not be able to undergo transpiration. Without transpiration there will be less movement of water from the roots to the leaves.

     

    c)If the plant in submerged in water, there might not be access to oxygen. Thus, the plant will undergo anaerobic respiration.

     

    d) L(palisade mesophyll cell)

    Cell L: arranged tightly packed below the upper epidermis.

    -Cylindrical in shape

    Spongy mesophyll cell: Arranged loosely.

    -IrregularĀ  in shape

     

    e)During the day, the plant undergoes photosynthesis. Potassium ions are accumulated thus water enters the guard cells causing them to swell up.

    During the night, there is no photosynthesis thus potassium ions and water leave the guard cells causing them to become flaccid.

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