葉綠素碳酸氫鹽鈉指示劑三種顏色：紫、紅、黃顯微鏡下

1、B. 影帶：光合作用所需條件：二氧化碳光合作用所需條件：光強(qiáng)度光合作用所需條件：水光合作用所需條件：葉綠素碳酸氫鹽/鈉指示劑的三種顏色：紫、紅、黃顯微鏡下的葉綠體http:/ 1.Why is the leaf first boiled in water? This kills the leaf and allows the ethanol / alcohol to pass into it.2.Why is the leaf is then boiled in alcohol? To remove the chlorophyll / to decolourize for easy obser

2、vation of the result.3.Why is the leaf put in hot water after being boiled in alcohol? To soften the leaf4.What colour change can be observed if starch is present? The leaf becomes blue-black. Ch8: nutrition in plantsphotosynthesis8.1: Photosynthetic Autotrophs光合自養(yǎng)生物 Green plants are photosynthesis

3、autotrophs which carry out photosynthesis (光合作用) to make complex organic food (glucose) from simple inorganic substances(H2O and CO2). phos = light (Greek) Synthesis = putting together The process by which greengreen plants use the chlorophyll chlorophyll (葉綠素) to change light energy to chemical ene

4、rgy for the production of sugars sugars from H H2 2O and COO and CO2 2Oxygen is released as a by-product (副產(chǎn)品)8.2: The process of photosynthesis光合作用的過程Sites of photosynthesis8.3:8.3: the mechanism of photosynthesisthe mechanism of photosynthesis光合作用的機(jī)制lightlight reaction(光反應(yīng)) + darkdark reaction(暗反應(yīng)

5、)Needs lightlight does notdoes not need lightlightLight reaction Light reaction ( (光反應(yīng)光反應(yīng)) ) 1. ChlorophyllChlorophyll absorbs lightlight energy (colour)2. The absorbed light light energy is used to split split分解 water water molecules into hydrogen hydrogen 氫 and oxygenoxygen氧3. OxygenOxygen diffuse

6、s out of cells into airair. hydrogen hydrogen is used in the dark dark reaction.Dark reactionDark reaction暗反應(yīng)暗反應(yīng)occurs both in the presence of light or absence of lightHydrogen combines with CO2 , forming glucose and water. Overall reaction of photosynthesisOverall reaction of photosynthesis光合反應(yīng)的整體反

7、應(yīng)光合反應(yīng)的整體反應(yīng)4HH2O8.4:8.4: fate of carbohydrate products in plant fate of carbohydrate products in plant碳水化合物產(chǎn)品於植物體內(nèi)的命運(yùn)碳水化合物產(chǎn)品於植物體內(nèi)的命運(yùn) Oxdized氧化 to release energy in respiration呼吸作用 to support growth etc. Transported as sucrose蔗糖 through the phloem靱皮部out of the leaf to storage organs or growing point生長

8、點(diǎn). Sugar will be changed to cellulose, fat, protein to support growth. Changed into insoluble starch 澱粉 for temporary storage .Flow chart hyperlinkingFlow chart hyperlinkingA. Presence of lightaccumulation of starch8.4:8.4: fate of carbohydrate products in plant fate of carbohydrate products in plan

9、t碳水化合物產(chǎn)品於植物體內(nèi)的命運(yùn)碳水化合物產(chǎn)品於植物體內(nèi)的命運(yùn) No photosynthesis takes place No sugar produced. The stored starch sugar oxidized 氧化 or transported away. This process is called destarchingdestarching脫澱粉過程脫澱粉過程A. absence of lightdestarching 脫澱粉過程脫澱粉過程8.5:8.5: Tests Tests for photosynthesis products. for photosynthesis products.A. Test for A. Test for StarchStarch in green leaf in green leaf葉內(nèi)葉內(nèi)澱澱粉粉試驗(yàn)試驗(yàn) (1)(2) (3) (4)Why is the leaf first boiled in water?Why is the