2017 DSE Bio 討論區

睇唔明文字講乜...

因為set up1: water only
因為set up2: water that has been shaken with a large amount of pollen and then filtered

但點解pollen會有germination?

germination = outgrowth of pollen tube?

我係連段文字都唔明...

擺係水點會有germination of pollen

睇唔明文字講乜...

因為set up1: water only
因為set up2: water that has been shaken with a large amount of pollen and then filtered

但點解pollen會有germination?

germination = outgrowth of pollen tube?

我係連段文字都唔明...

擺係水點會有germination of pollen

點解唔得
有水有空氣

睇唔明文字講乜...

因為set up1: water only
因為set up2: water that has been shaken with a large amount of pollen and then filtered

但點解pollen會有germination?

germination = outgrowth of pollen tube?

我係連段文字都唔明...

擺係水點會有germination of pollen

點解唔得
有水有空氣

pollen grains germination應該仲要sucrose sol of suitable concentration?

厹介唔介意影幅睇得哂既同清啲既相

How i know which one grows faster

How i know which one grows faster

Irrelevant to growth rate
First look at initial masses, radicle should have a larger initial mass, that means it's either option A or C
Plumule and radicle will not have negative change of dry mass (only cotyledons will): so it's C

How i know which one grows faster

Irrelevant to growth rate
First look at initial masses, radicle should have a larger initial mass, that means it's either option A or C
Plumule and radicle will not have negative change of dry mass (only cotyledons will): so it's C

Why radicle has larger initial mass

How i know which one grows faster

Irrelevant to growth rate
First look at initial masses, radicle should have a larger initial mass, that means it's either option A or C
Plumule and radicle will not have negative change of dry mass (only cotyledons will): so it's C

Why radicle has larger initial mass

because emergence of radicle happens first?
i'm not sure actually

唔明independent assortment 係咪指gamete formation chromosome 會調位 唔會maternal chromosomes 係晒同一邊？

Aim2/3 係咪睇曬啲大topic就夠

有冇名師今年tip咩essay呢

Bio啲題目真係好鐘意轉彎抹角咁問...

唔明independent assortment 係咪指gamete formation chromosome 會調位 唔會maternal chromosomes 係晒同一邊？

law of independent assortment 係指 each pair of alleles segregates independently of each other pair of alleles during gamete formation
但有個限制係兩pair alleles 唔可以located 係同一條chromosome 到

How i know which one grows faster

Irrelevant to growth rate
First look at initial masses, radicle should have a larger initial mass, that means it's either option A or C
Plumule and radicle will not have negative change of dry mass (only cotyledons will): so it's C

Why radicle has larger initial mass

because emergence of radicle happens first?
i'm not sure actually

That's true!
Radicle will grow out first so that the seed can absorb water and minerals from soil

有無ching有2012-16 pp

有無ching有2012-16 pp

上Dse00 資源區

有無ching有2012-16 pp

上Dse00 資源區

得中文

有無ching有2012-16 pp

上Dse00 資源區

得中文

有啲年份有英文🙈
再冇就上小卒啦

點解答案係A 嘅？
Within population同 in a population 嘅分別係咩？

點解答案係A 嘅？
Within population同 in a population 嘅分別係咩？

無分別。
因為mutation by addition of extra gene

點解答案係A 嘅？
Within population同 in a population 嘅分別係咩？

The independent assortment of chromosomes and crossing over in meiosis are source of genetic variations
Speciation is result of natural selection which has genetic variation as basis

點解答案係A 嘅？
Within population同 in a population 嘅分別係咩？

冇分別，你捉錯嗰句嘅重點。
重點係act on，再清楚啲即係act upon/depend on。

點解答案係A 嘅？
Within population同 in a population 嘅分別係咩？

無分別。
因為mutation by addition of extra gene

自膠睇錯 mutation as meiosis
Lol

點解答案係A 嘅？
Within population同 in a population 嘅分別係咩？

冇分別，你捉錯嗰句嘅重點。
重點係act on，再清楚啲即係act upon/depend on。

Natural selection同speciation都冇一個過程會令某一個species嘅genetic variation增加。因為natural selection 呢個process涉及將一啲冇咁好嘅phenotype嘗試eliminate咗佢，而嗰啲phenotype係由對應嘅gene產生。而speciation實際上涉及isolation然後natural selection。

btw 其實佢呢題其實有問題
佢抄ce有一年mc, 但概念抄錯