bio dse 2022

得返四日仲可以點溫？齋睇Marking Skeme 同做 by topic mc 係咪已經夠？PS Aim lvl 4

背曬書未？

淨係記咗每一課嘅重點

Paper 1A
MC
難度應該同上年差唔多 難度中等 要汁多d分 建議淨係做dse mc

Paper 1B
Long question
How 題要做到 how come + so what

Describe & explain data題 要攞到Describe data 嗰分

比2x2 table要做到直向比較 橫向比較
比2條curves 要講到兩條線嘅交差點 同埋at time A, X>Y; at time B, X<Y 建議自己做一做data 題
Explain就記住回應題目keyword

罐頭答法答唔足滿分唔緊要
背一背常見罐頭例如
breathing mechanism 4分,
neuromuscular junction 4分,
food chain heat loss 4分,
immunity 4分,
water potential 3分,
transpiration pull 3分,
ecological succession 3分,
ecology要推到去扑野
genetic 要講到做左mitosis 定meiosis

Nitrogen cycle
Carbon cycle
Anaerobic respiration
背marking scheme就ok

Respiration
Photosynthesis
用實驗形式可以好難 問得好detail 可能全體抄車 睇完覺得難 可以做下題先

Paper 2
Elective
E1 出hormonal cycle 大機會全世界抄車
主攻前3個mechanisms

E2 吹水 難好高分

E4 著重理解 問advantage+disadvantage可以4分

Adaptive features of diffusion 4大方向:

出親就4分 圖睇到feature先有分

你寫3個features只睇頭2個

1）
Increase in surface area

例如highly folded, highly branched, emulsification, spherical shaped, root hair

仲有increase in cross-sectional area=more time for material exchange

2)
Maintain steep / steeper concentration gradient

例如presence of capillary, decrease in humidity, increase air flow, increase breathing/heart rate

3)
Reduce diffusion distance

例如thin wall, less mucus secreted

寫epithelium冇分 要有thin epithelium先有分

4)
Close contact

例如 peristalsis, root penetrate soil, capillary bed


最後
Water film
allows
gases to dissolve in it

enlarged air sacs reduced the thickness of water film, reducing diffusion distance

Respiration出難題機會唔太大
好似出親都係basic knowledge

都係
1B

2012 aerobic respiration 極難12分
2018 aerobic respiration 4分背書問end products
2013
其餘年份冇


先溫photosynthesis

有冇多啲常見罐頭

Nature of science 題目點答？

例如係2015 1B 6d) Science is evidence based, doing science requires imagination…

DNA to mRNA to amino acid sequence to folded protein (4) (2018Q9a)(2017Q4c)

mRNA frameshift/substitution to Protein conformation (3)
(Nonsense mutation: change from amino acid to stop codon 2020 2021問左) (3)

Stimuli (receptor) to nervous system to response(effector) (3)

Natural selection/speciation (4) (2018Q10a)

Blood group antigen (3) (2018Q6a)

Seed germination to pollen tube to fertilisation (4) (2017Q3b)

Photosynthesis ATP NADPH function (4) (2017Q7c)

Genetics:
Find dominant allele (4)
X-linked or not (4)
https://youtu.be/Z0CBXiF3uek 講得好好
19:15 之後重點

Thanks a lot

Oxygen debt 原理

https://youtu.be/3moWhdGoRrI
有lactic acid 弱酸值潔淨呵護女性潔膚液
所以vagina入面需要acidic 好處係prevent bacteria growth
調返轉semen就alkaline

點解xylem在內phloem在外？

有lateral growth嘅情況下
如果xylem在外, 佢又硬(lignified)又冇彈性(dead cell) 會限制內的phloem生長 會谷爆入面phloem tissue 棵樹就生唔粗
Xylem 在內就冇問題 佢向內生

有咩DSE題目唔明都可以問我呀 溫書加油 firm

英文2012-2022 bio 卷
https://drive.google.com/drive/folders/1hGECX3RHuYm7EQzS5QNK5wL-R74b16L0?usp=sharing

Nature of science 題目點答？

1.
Based on observation (empirical)

2.
Be creative in making hypothesis

3.
Is subject to change if new evidences arise

4.
Is influenced by social and cultural factors

5.
Experimental result is reproducible

https://www.sciencelearn.org.nz/resources/413-tenets-of-the-nature-of-science

罐頭最終整合(2012-2021)

Food chain heat loss
(2020Q2ab) (2018essay: carbon in food chain) (2015Q3c)

Immunity (4)
(2021Q6a) (2019Q1b)(2017Q9b)(2013Q9b)

Water potential (3)
(2019Q6a) (2018Q2bc)(2017Q2)(2012Q8a)

DNA to mRNA to amino acid sequence to folded protein (4)
(2018Q9a)(2017Q4c)(2014Q6a)(2013essay:3)

Natural selection/speciation (4)
(2018Q10b)(2021essay:3)(2019Q8c) (2019essay:human selection)(2015Q10b)(2014Q6b)

Turgidity and rigidity of plant cell (4)
(2014Q4b)(2012Q3b)(2015Q9b)

Insulin/Glucagon effect (3)
(2018Q7b)(2015Q8bi,ii)

Ecological succession (3)
(2019Q7b)(2014Q5bii)

mRNA frameshift/substitution to Protein conformation (3)
(Nonsense mutation: change from amino acid to stop codon 2020Q9c 2021Q6c問左) (3)

Blood group antigen (3)
(2018Q6a)(2015Q4c)

Breathing mechanism (4)
(2017Q5a)
Ligament and tendon function (4)
(2013Q2b)
Mucus and beating action of ciliated-epithelium (2014Qb)
Seed germination to pollen tube to fertilisation (4)
(2017Q3b)
Photoreceptor distribution (4)
(2014Q10)
Photosynthesis ATP NADPH function (4) (2017Q7c)
Neuromuscular junction (3)
(2015Q5c)
Coronary heart disease (4)
(2018Q4c)
Capillary bed tissue fluid formation (2011essay:5)
Source of genetic variation
(2021essay:5)

Stimuli (receptor) to nervous system to response(effector) (3)

transpiration pull (3)

罐頭近年越來越少
paper1b 減左essay嗰11分70幾分滿分 我諗罐頭唔會多過10分

AL 可以做1B 有少量out syll

巴打想請教你E1 2019 a)(ii)(1) 點解要特登講埋after injection 個FSH level會resume normal level
我自己嘅理解係單純比較graph 1 and 2 會有相反效果 eg. oestrogen level increase, the FSH level decrease or in vice versa 咁既然比較咗graph1同2 特登mention番FSH level resume back to normal係咪想證明injection呢個process冇影響到FSH secretion --> the drop in level in FSH is only due to the increase in level of oestrogen 呢
求巴打解答

係

我會咁寫

In graph 2,
Injection of oestrogen maintains low level of FSH. (marking 第2分）

When injections are ended, oestrogen level drops and FSH rises. (marking 第3分）

In graph 1,
Without the treatment of oestrogen ingestion, FSH level rises with the decrease of oestrogen level (marking 第1分),in which agrees with the results after the injections are ended in graph 2.

Oestrogen inhibits the secretion of FSH into blood.(marking 第4分）


不過你呢個point呢應該唔會E1出

應該會1B 出 轉左個實驗 然後用返你呢個邏輯答