Question 3 (a) Some candidates did not refer to the experiment. - - PowerPoint PPT Presentation

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Question 3 (a) Some candidates did not refer to the experiment. - - PowerPoint PPT Presentation

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Question 3 (a) Most candidates provided a proper explanation. Question 3 (a) Some candidates did not refer to the experiment. Question 3 (a) Some candidates did not understand the experiment. Question 3 (a) Some

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Question 3 (a)

Most candidates provided a proper explanation.

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Question 3 (a)

Some candidates did not refer to the experiment.

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Question 3 (a)

Some candidates did not understand the experiment.

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Question 3 (a)

Some candidates wrongly interpreted that Spemann developed complete organisms from the hair cells!

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Question 3 (b)

Some candidates did not refer to the example.

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Question 3 (b)

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Question 3 (b)

Candidates were not familiar with, or had some difficulty in understanding, the statement.

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Question 3 (c)

Many candidates mixed up mitosis with meiosis. They thought that homologous chromosomes separated during mitosis. Some candidates did not distinguish between the terms “chromatin”, “chromatid” and “chromosomes”. 錯別字：復製 複製什麼?

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錯別字：複雜 染色單體分離

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Question 3 (c)

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Question 3 (c)

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Question 3 (c)

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Question 3 (c)

Some candidates mixed up protein synthesis and DNA replication.

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Question 3 (c)

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Question 4 (a)

  • The quality of the drawing was poor.
  • Many candidates did not know the

requirements for low-power drawings and gave cellular details in their drawings.

  • They failed to recognise different tissues

shown in the photomicrograph and gave wrong labels.

  • They also failed to give a proper title for their
  • drawings. Some candidates simply copied

wording from the questions and used this as their title.

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Question 4 (a)

Some drawings were irrelevant.

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Question 4 (a)

whole stem section were drawn

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Question 4 (a)

no title no label gave cellular details

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Question 4 (a)

gave cellular details

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Question 4 (a)

gave cellular details

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Question 4 (a)

failed to recognise different tissues

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Question 4 (a)

Which parts were being labelled?

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Question 4 (a)

simply copied wording from the questions and used this as their title misspelt epidermis as epithelium 4 vascular bundles failed to recognize sclerenchyma

labelled the pith as the cortex

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Question 4 (a)

2 vascular bundles

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Question 4 (a)

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Question 4 (a)

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Question 4 (a)

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Question 4 (a)

Title

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Question 4 (b)

  • Poorly answered. Most candidates did not pay

attention to the proportions of different tissues in the stems.

  • Instead of making deductions from the

photomicrograph, many candidates recited their knowledge about support in plants. Only very few candidates made reference to the

  • bservations from the photomicrograph.
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Question 4 (b)

How do the tissues provide support?

did not pay attention to the proportion of the supporting tissues

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Question 4 (b)

failed to recognise different tissues

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wrong function of phloem

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Question 4 (b)

failed to recognise different tissues

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Question 4 (b)

failed to recognise different tissues

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Question 4 (b)

Which was the major mean of support?

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did not pay attention to the proportion of xylem in the stem

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Question 4 (b)

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Question 8 (a)

  • A primrose plant …
  • An insect-pollinated plant …
  • 2 observable features…
  • Well answered.
  • A simple and straightforward one assessing

candidates’ knowledge of the characteristics of insect-pollinated flowers.

  • More than half of the candidates were able to give

two observable features.

Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 35

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Question 8 (a)

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Question 8 (a)

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Question 8 (a)

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Question 8 (b)(1)

  • Poorly answered.
  • Only one-third of

the candidates suggested the correct position.

Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 39

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Question 8 (b)(1)

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Question 8 (b)(2)

  • Fair.
  • About half of the

candidates were able to point out which type of flower would be more readily pollinated.

  • Among these candidates,

half of them were able to provide a proper explanation.

Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 41

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Question 8 (b)(2)

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Question 8 (b)(2)

Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 43

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Question 8 (b)(3)

  • Poorly answered.
  • Many candidates failed to

link this up with the idea

  • f increasing the chance of

pollination between

different types of primrose.

  • Even if they did, they

failed to elaborate on its importance to increase genetic variation in the next generation.

Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 44

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Question 8 (b)(3)

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Question 8 (b)(3)

Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 46

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Question 10 (a)

  • Poorly answered.
  • Many candidates

misinterpreted the graph as showing the distribution of neurones on the retina rather than in the visual centre.

  • Despite the fact that

the question highlighted different types of photoreceptor cells, many candidates simply referred to cone cells and rod cells.

Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 47

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Question 10 (a)

  • They did not realize

that there are three different types of cone cells for colour vision and that each type of cone cell would send nerve impulses to the visual centre,

  • nor were they aware of

the necessity of having more neurones to analyse the signals from different types of cone cells.

Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 48

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Question 10 (a)

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Question 10 (a)

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Question 10 (a)

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Question 10 (a)

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Question 10 (b)

  • Fair.
  • Many candidates

knew that the association centre was responsible for interpretation.

  • However, they were

not aware that the image seen will only make sense with reference to previously stored memory.

Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 53

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Question 10 (b)

Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 54

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Question 10 (b)

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Question 10 (b)

Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 56

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Question 10 (b)

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