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

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

Question 3 (b) Some candidates did not refer to the example.   

Question 3 (b)  

Question 3 (b) Candidates were not familiar with, or had some difficulty in understanding, the statement.   

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 ? 錯別字：複雜   染色單體分離

Question 3 (c)      

Question 3 (c)    

Question 3 (c)   

Question 3 (c) Some candidates mixed up protein synthesis and DNA replication. 

Question 3 (c)   

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.

Question 4 (a) Some drawings were irrelevant. 

Question 4 (a) whole stem section were drawn    

Question 4 (a) no title no label gave cellular details 

Question 4 (a) gave cellular details      

Question 4 (a) gave cellular details    

Question 4 (a) failed to recognise different tissues 

Question 4 (a) Which parts were being labelled?  

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

Question 4 (a) 2 vascular bundles   

Question 4 (a)     

Question 4 (a)     

Question 4 (a)     

Question 4 (a) Title    

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 observations from the photomicrograph.

Question 4 (b)  How do the tissues provide support?  did not pay attention to the proportion of the supporting tissues

Question 4 (b) failed to recognise different tissues     wrong function of phloem

Question 4 (b) failed to recognise different tissues   

Question 4 (b)  failed to recognise different tissues   

Question 4 (b) Which was the major mean of support?    did not pay attention to the proportion of xylem in the stem

Question 4 (b)    

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

Question 8 (a)   Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 36

Question 8 (a)   Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 37

Question 8 (a)   Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 38

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

Question 8 (b)(1)   Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 40

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

Question 8 (b)(2)   Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 42

Question 8 (b)(2)  Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 43

Question 8 (b)(3) • Poorly answered. • Many candidates failed to link this up with the idea of 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

Question 8 (b)(3)   Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 45

Question 8 (b)(3)   Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 46

Question 10 (a) • Poorly answered. • Despite the fact that the question • Many candidates highlighted different misinterpreted the types of photoreceptor graph as showing the cells, many candidates distribution of simply referred to cone neurones on the retina cells and rod cells. rather than in the visual centre. Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 47

Question 10 (a) • They did not realize • nor were they aware of that there are three the necessity of having different types of cone more neurones to cells for colour vision analyse the signals and that each type of from different types of cone cell would send cone cells. nerve impulses to the visual centre, Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 48

Question 10 (a)  Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 49

Question 10 (a)   Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 50

Question 10 (a)    Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 51

Question 10 (a)  Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 52

Question 10 (b) • Fair. • However, they were not aware that the • Many candidates image seen will only knew that the make sense with association centre reference to was responsible previously stored for interpretation. memory. Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 53

Question 10 (b)  Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 54

Question 10 (b)   Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 55

Question 10 (b)  Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 56

Question 10 (b)  Thursday, November 27, 2014 2014 HKDSE BIOLOGY Q8 & Q10 57