在晝夜周期條件下,維持植物正常生命活動(dòng)所需要的最低光照強(qiáng)度應(yīng)   (  )

  A、大于光補(bǔ)償點(diǎn)      B、等于光補(bǔ)償點(diǎn)

  C、小于光補(bǔ)償點(diǎn)      D、大于或等于光補(bǔ)償點(diǎn)

A


解析:

光合作用吸收的CO2與呼吸作用釋放的CO2相等時(shí),即表觀光合速率為零時(shí)的光照強(qiáng)度稱為光補(bǔ)償點(diǎn)。當(dāng)光照強(qiáng)度低于光補(bǔ)償點(diǎn)時(shí),呼吸作用釋放的CO2就會(huì)大于光合作用吸收的CO2的量,這樣植物體內(nèi)有機(jī)物就會(huì)被慢慢消耗盡。因此,要維持植物正常生命活動(dòng),光照強(qiáng)度應(yīng)大于光補(bǔ)償點(diǎn)。

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30、Ⅰ(7分)為探究環(huán)境因素對(duì)植物光合作用強(qiáng)度的影響,設(shè)計(jì)進(jìn)行如下實(shí)驗(yàn):

實(shí)驗(yàn)材料和用具:圖示實(shí)驗(yàn)裝置(廣口瓶容積為500mL)、100 mL量筒、200W的臺(tái)燈、冷開(kāi)水、不同濃度的NaHCO3溶液(冷開(kāi)水配制)、黑藻等。實(shí)驗(yàn)重復(fù)三次,實(shí)驗(yàn)結(jié)果見(jiàn)下表。                                                                                                                                            

 

分析并回答下列有關(guān)問(wèn)題:

(1)該實(shí)驗(yàn)中的自變量是            ,列出實(shí)驗(yàn)中的至少兩個(gè)控制變量(無(wú)關(guān)變量):

                                       

(2)試補(bǔ)充完成該實(shí)驗(yàn)探究的具體實(shí)驗(yàn)步驟。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

①準(zhǔn)備4套如圖裝置,編號(hào)為1----4,分別在各瓶中注入冷開(kāi)水、0.1%NaHC03溶液、1.0%NaHC03溶液、5.0%NaHC03溶液各約500mL;

②取                                    ,分別放入各實(shí)驗(yàn)裝置,并組裝好實(shí)驗(yàn)裝置;

③將4套裝置             ,然后分別用                    ;

④30min后,                                       。

⑶由于黑藻自身呼吸作用會(huì)消耗氧氣,故量筒中收集到的水的體積

不能表示為黑藻30min內(nèi)的光合總量,請(qǐng)根據(jù)上表繪制出相關(guān)的

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Ⅱ(5分)植物的光合作用受內(nèi)、外多種因素的影響,如圖是在20℃、0.03%CO2濃度條件下,測(cè)得A、B兩種植物在不同光照條件下光合速率變化曲線。請(qǐng)據(jù)圖回答問(wèn)題:

(1)圖示表明,       植物更適宜在弱光照條件下生長(zhǎng),這是由植物本身的              決定的。生產(chǎn)上如果將A、B共同種植,形成群落的         結(jié)構(gòu),將可達(dá)到充分利用光能的目的。

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30、Ⅰ(7分)為探究環(huán)境因素對(duì)植物光合作用強(qiáng)度的影響,設(shè)計(jì)進(jìn)行如下實(shí)驗(yàn):
實(shí)驗(yàn)材料和用具:圖示實(shí)驗(yàn)裝置(廣口瓶容積為500mL)、100 mL量筒、200W的臺(tái)燈、冷開(kāi)水、不同濃度的NaHCO3溶液(冷開(kāi)水配制)、黑藻等。實(shí)驗(yàn)重復(fù)三次,實(shí)驗(yàn)結(jié)果見(jiàn)下表。                                                                                                                                           
分析并回答下列有關(guān)問(wèn)題:

(1)該實(shí)驗(yàn)中的自變量是           ,列出實(shí)驗(yàn)中的至少兩個(gè)控制變量(無(wú)關(guān)變量):
                                       
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②取                                   ,分別放入各實(shí)驗(yàn)裝置,并組裝好實(shí)驗(yàn)裝置;
③將4套裝置            ,然后分別用                   
④30min后,                                      
⑶由于黑藻自身呼吸作用會(huì)消耗氧氣,故量筒中收集到的水的體積
不能表示為黑藻30min內(nèi)的光合總量,請(qǐng)根據(jù)上表繪制出相關(guān)的
柱形圖。


Ⅱ(5分)植物的光合作用受內(nèi)、外多種因素的影響,如圖是在20℃、0.03%CO2濃度條件下,測(cè)得A、B兩種植物在不同光照條件下光合速率變化曲線。請(qǐng)據(jù)圖回答問(wèn)題:
(1)圖示表明,      植物更適宜在弱光照條件下生長(zhǎng),這是由植物本身的             決定的。生產(chǎn)上如果將A、B共同種植,形成群落的        結(jié)構(gòu),將可達(dá)到充分利用光能的目的。
(2)在晝夜周期條件下(12h光照、12h黑暗),A植物需在光照強(qiáng)度___  __千勒克斯才能生長(zhǎng)。
(3)當(dāng)光照強(qiáng)度為8千勒克斯時(shí),A植物每小時(shí)光合作用所制造的有機(jī)物量與B植物制造的有機(jī)物量的比例是        

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