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2018-04-06

【BIO】2018 DSE Paper1A (MC) suggested answer

以下答案來自網上,謹供參考及討論之用
同學睇答案前請考慮清楚,如果決定睇,不要太在意試卷答案

MC (網友提供)

答案
1.D     2.C    3.B      4.A      5.D
6.D    7.A     8.C      9.C      10.A
11.D   12.A   13.C     14.A      15.D
16.D   17.C   18.C    19.B      20.D
21.C   22.A   23.B   24.B     25.A
26.A   27.B   28.A   29.D     30.B
31.B   32.C   33.B   34.A     35.D
36.C


1. ABC are wrong because their enzyme work inside the cell rather on cell membrane.
2. ABC maybe true but dont match the observation.
3. B, if enzyme ist reusable, no gas bubble.
4. hydrogen peroxide is a variable.
5. inverted pyramid of biomass means the producer has a very high rate of reproduction (such as protist)

6. the main point is ecological balance
7. the light behind the eye is long-sighted.
8. blood capillary and short distance can be seen.
9. DNA difference is the basic of classification.
10. Memory B cell only recognise the same pathogen.

11. A: cytoplasm, B,C: matrix, D: inner membrane.
12. the offspring is heterozygous with same genotype and only dominant present.
13. (2),(3) are essential to generate different combination of genotype. (1) seem not the "most possible".

20. (1) inter-neurone (2) sensory neurone, with cell body located on dorsal root ganglion (3) motor neurone, with long axon. X is motor neurone connecting and controlling the contraction of muscle.

25. The retention time of storage organ depends on the volume. Just like you go toilet when the urine up to certain volume. So the retention time of faeces also depends on volume so 
     larger volume = less time (assume we all agree that)
     more fibre = less time, 
     then more fibre = larger volume.
D is wrong because we cannot deduce hardness from the graph

29. C6H12O6, H2O only contribute two H for glucose (O become O2). 6C and 6O come from CO2. 
35. X is right ventricle because the online picture.

continue...

51 則留言:

  1. the ans of 20 is probably D
    X連住肌肉係運動神經元即係3
    Y係感覺神經元即係2

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  2. For question 35, isn't it D ? (i m not sure , but chamber X is more likely to be ventricle ?)

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    1. I think X is likely left atrium

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    2. but the wall of the other side is thicker, shouldn't it (chamber X) be the right side?

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    3. and the right atrium is located at a higher point... so chamber X should be right ventricle ?

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  3. 35題 chamber X唔係right atrium咩 佢個wall好似薄過隔離果邊個wall

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  4. Q35: chamber X is left atrium. For atrium, there is no discussing the thickness of wall

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  5. X is atrium? Are you sure? Have you ever dissect a pig heart? It is right ventricle for sure

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  6. The answer for 5 is D.
    As mentioned in oxford textbook, inverted pyramid of biomass indicates that the producer has a very high rate of reproduction. The textbook used phytoplankton as an example (Chapter 20 Page 33) as it has a very high reproduction rate.


    The answer for 35 should be D,
    The section in the middle is the spetum, divding the two ventricles
    As it is the smaller ventricle with less thick muscles, it must also be the right ventricle.
    C is incorrect, as ventricles do not receive blood from vena cava, but the right atrium.
    Hence D is the answer

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  7. It can also be known that the heart chanbers in 35 is ventricles as atrium shouldnt share a wall with each other, only ventricles will share a wall called septum

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    1. wtf is atrium didnt share the wall? there are also interartrial septum

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  8. no need argue everyone for Q35!! It's very simple!!!!
    https://cpb-us-west-2-juc1ugur1qwqqqo4.stackpathdns.com/www.asfmtech.org/dist/1/712/files/2014/10/lambheartinteriorlabeled-v138gt.jpg

    so it must be right ventricle! Those saying atrium see you next year :)

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    1. 睇錯係atrium咁又點 錯咪錯 一條姐
      洗唔洗咁口賤話see you next year啊
      錯一條都see you next year 咁恭喜你你無滿分啊 see you next year :)

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    2. 原來網上有原圖..

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    3. 作者已經移除這則留言。

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    4. 作者已經移除這則留言。

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    5. http://cristolleyva.blogspot.hk/2011/03/heart-dissection.html
      你把口真係好撚賤:)you are actually the one going to retake next year!:)

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    6. so rude saying foul language! ("你把口真係好撚賤")

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  9. search heart dissect in google can find the original photo with label. The label should be labelling right ventricle

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  10. and 1D is also incorrect coz digestion of carbohydrates occur out side the cell not in cell mebranes
    Note that cell membranes is in plural. It should refer to all cell related phospholipid layers

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    1. 1D is correct. It occurs on the surface of the epithelial cells.

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  11. why the question 25 answer is A ?

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    1. self-explanatory...

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    2. I wonder if 25 is B ?

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    3. but I think ans D is more based on the given information

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    4. For A, with more dietary fibre, making the faece more bulky, stimulate the peristalsis, so decrase the retention time.

      For B, it is not true. Dietary fibre is not osmotic agent.

      For D, it is a wrong causative relationship. The amount of fibre does not relate with the time of water absorption by the faece

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    5. but question has stated the relationship of dietary fiber content and duration time for material stay in large intestine

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    6. I think Q25 should be D. Deduced from the result shown in the graph, i.e. less dietary fibre content leads to longer retention time at large intestine, we can know that the time of water absorption will be longer and consequently the faeces will be harder. The causative relationship is very clear here.
      For A, it is not something deduced from the graph, but instead it is a possible explanation of the result shown by the graph. Option A will only be the answer if the question asks 'Which of the following can explain the graph?'

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  12. why Question 29 is D?

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    1. C6H12O6, H2O only contribute two H for glucose (O become O2). 6C and 6O come from CO2.

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  13. 我想問幾個問題
    點解Q25唔係D? 點解Q29唔係A?
    另外我想知各位認為今年bio難唔難?
    個cut-off會唔會跌?
    同埋希望知道1B 嗰條恐龍essay要寫乜point.

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    1. Q25:
      retention time does not imply water absorption time.

      Q29:
      plant biomass is measured as organic-bound carbon per unit area
      so it's D.

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    2. Retention time does imply water absorption time. From the question, it is stated clearly that retention time refers to the duration for which the undigested materials stay in the LARGE INTESTINE. Water is continuously absorbed in large intestine.

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  14. In my view,the carbon in the dinosaurs is changed to coal after its death. Then, combustion of coal gives carbon dioxide in the atmosphere. Then , the plant converts carbon dioxide into glucose by photosynthesis and stores it as starch. After Mary eats the food , the food is digested into glucose again.Then, the glucose changes to carbon dioxide by cellular respiration and gives out in the breath by gaseous exchange in the lung.

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    1. First ,the dinosaurs dead body is decomposed by fungi.Converting organic substances into inorganic.Fungi absorb nutrients(carbon including) and uses for anaerobic respiration.carbon dioxide is produced and release into the atmosphere.After million of year,the carbon is converted into glucose by plant and it is regenerated by fungi.in the end it exist as an atmospheric co2 and appear in mary breath

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  15. I am completely different from you D: i am nervous.Am i wrong?how many mark i worth?

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  16. MC 29 is D?

    HKEAA: Fuck you inparticular

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  17. 29/36 可以攞幾多?

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  18. 第二條個解釋係D但點解寫左C

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