DSE 生物BIOLOGY 區

我啱啱email左eaa問
等佢答就唔使估估下

戇鳩

Level 2 cutoff 一定唔準，因爲好少人會 upload 啲咁嘅分。不過你講得啱，唔好理咁多，依家淨係鳩背啦

就係by topics咁樣鳩背？

搭嗲一句 dse00冇lv2 cut off
無錯求2鳩背就岩

yup 記晒唔同野既functions、adaptive features個啲

只睇圖可以係food web可以係material/energy flow喎

冇你咁叻嘛
我天生係on9

Food chain係只show一個food web入面嘅一個linear關係
一定係producer to top predator
平唔平時都唔會有decomposer

其實e2係咪主要答bioaccumulation

get唔到e2要點溫

Energy flow理論上好少involve decomposer
因為energy flow係講food chain 即係tropic level
Trophic level你讀完都知從來唔會有decomposer
但DSE題目當然出得好馬虎
係nutrient cycling 先會consider decomposer
所以幅圖其實係food web/nutrient flow嘅機會更大
只係DSE角度嚟睇 佢話係energy flow只係唔合乎ecology中嘅用法 但講有energy flow亦都係有可能

唔係教E2 冇睇過唔知

睇一次last minute夠拎3啦

Trophic level 有decomposer
因為本身decomposer 可以feed on 任何一個trophic level，所以所有energy最終都係流向decomposer
Decomposer 本身就係比較特殊嘅一類
2017 MC 第35題都出過類似嘅嘢

Global warming
Acid rain
Sustainable development
Fishery and agriculture resource management
Eutrophication 同algal bloom
Chemical pollution (bioaccumulation and biomagnification)
以上topics一定要熟 (背哂有得背嘅野) 之外，Ecosystem都要熟
另外對於點形容data，deduce reasons 個啲技巧要有
想再高分啲就要知道environmental studies嘅基礎知識，例如佢會問你點解要conduct依個study啦，又或者limitation個類
不過最緊要都係common sense

我諗你誤會左我意思
我話嘅係係真正ecological study入面food chain用法係有格式，所以上面都話DSE馬馬虎虎係有可能將佢濫用
Food chain係ecology正確係要由producer去到apex consumer 去show linear consumption關係
所以decomposer係唔會出現係一個food chain 正如你所講所有level都會流向decomposer 所以只會出現係food web或material cycling
Food chain trophic level係ecological study都係用嚟show linear link
當然你要每個food chain叉出嚟指去decomposer 邏輯上係冇錯 但係就唔係food chain 嘅一般用法
Energy flow我係話睇個陣主要唔會consider decomposer，而唔係唔會有energy flow去decomposer

哦 明白巴打意思了
咁的確grazing food chain 同detrital food chain 係兩樣嘢嚟
所以正確嚟講應該要用food web嚟表達埋decomposer?