Conditions: light, pigment, photoreactive enzyme
Location: On the membrane of cystic structure.
Influencing factors: light intensity, water supply
Two absorption peaks of plant photosynthesis
The absorption peak process of chlorophyll a and chlorophyll b: two sets of photosynthetic systems on chloroplast membrane: photosynthetic system I and photosynthetic system II. (Photosynthetic system I is more primitive than photosynthetic system II, but electron transfer begins first. Under illumination, photons with wavelength of 680nm and 700nm are absorbed respectively, and electrons obtained from the photolysis path of water molecules are continuously transferred as energy. (Only a few special chlorophyll can be transferred.
Finally, it is passed to coenzyme NADP. However, due to different concentrations, hydrogen ions obtained by water photolysis move from thylakoid to matrix through the protein complex on thylakoid membrane, and the potential energy between them decreases, which is used to synthesize ATP for dark reaction. At this time, the hydrogen ions with reduced potential energy are taken away by the hydrogen carrier NADP. One NADP molecule can carry two hydrogen ions. This NADPH+H ion acts as a reducing agent in the dark reaction.
Meaning: 1: The photolysis of water (also called photolysis of water) produces oxygen. 2. Convert light energy into chemical energy, generate ATP, and provide energy for dark reaction. 3.NADPH+H ion is synthesized from hydrogen ion, which is the product of water photolysis, and provides reducing agent H (reduced hydrogen) for dark reaction.
There is oxygen
Respondents: Rice 0704- Jianghu rookie level 511-412:14.
I think the key to this problem is the condition. The first one can not only meet the light reaction and dark reaction conditions of photosynthesis, but also produce oxygen to make the leaves rise. The second time there was no NaHCO3, which seemed not to affect the dark reaction, but it was not. The photolysis of water in photoreaction produces oxygen, and the potential energy between them is used to synthesize ATP for dark reaction. And ATP here is an indispensable condition for dark reaction. Therefore, if the light reaction cannot be carried out, the dark reaction cannot be carried out due to the lack of reaction conditions. So the blades won't float!
Responder: Susan sun Jie- Trainee Magician Level 3 1 1-5 13:24.
You mean a light reaction that can (continuously) carry out photosynthesis without dark reaction? But the two are related. Only when dark reaction continuously consumes NADPH and ATP produced in the process of photoreaction, can the produced NADP+, ADP and Pi continuously provide raw materials for photoreaction (these substances in chloroplasts are limited and mutually transformed), and the photoreaction of photosynthesis can continue. Only in this way can the mesophyll cells produce enough oxygen to make the leaves float. If the dark reaction can't provide those substances for the light reaction, the light reaction of photosynthesis will also be blocked, and not enough oxygen will be produced to make the leaves float, that's all. For reference only!
Respondent: 0000 lxp- probation level 1 1 1-5 17:28.
Photosynthesis is a biochemical process in which plants, algae and some bacteria use chlorophyll to convert carbon dioxide and water into organic matter and release oxygen under the irradiation of visible light. Plants are called producers of food chain because they can use inorganic substances to produce organic substances and store energy through photosynthesis. By eating, consumers in the food chain can absorb the energy stored by plants, with an efficiency of about 30%. For almost all creatures in the biological world, this process is the key to their survival. Photosynthesis is very important for the carbon and oxygen cycle on the earth.
Traditional definition
Plants use the energy of sunlight to convert carbon dioxide into starch for animals and plants as food sources. Chloroplast is the place where plants carry out photosynthesis, so chloroplast can be said to be the medium through which sunlight transmits life.
(1) principle
Unlike animals, plants have no digestive system and must rely on other ways to absorb nutrients. Is the so-called autotroph. For green plants, in sunny days, they will use the energy of sunlight for photosynthesis to obtain nutrients necessary for growth and development.
The key participant in this process is the internal chloroplast. Under the action of sunlight, chloroplasts convert carbon dioxide entering leaves through stomata and water absorbed by roots into glucose and release oxygen at the same time;
Carbon dioxide +H2O→ carbon (H2O) nitrogen+oxygen +H2O
(3) Light reaction and dark reaction (called dark reaction in high school biology textbooks, and carbon reaction in some places)
Photosynthesis can be divided into two steps: light reaction and dark reaction.
(4) Photoreaction
Conditions: light, pigment, photoreactive enzyme
Location: On the membrane of cystic structure.
Influencing factors: light intensity, water supply
Two absorption peaks of plant photosynthesis
The absorption peak process of chlorophyll a and chlorophyll b: two sets of photosynthetic systems on chloroplast membrane: photosynthetic system I and photosynthetic system II. (Photosynthetic system I is more primitive than photosynthetic system II, but electron transfer begins first. Under illumination, photons with wavelength of 680nm and 700nm are absorbed respectively, and electrons obtained from the photolysis path of water molecules are continuously transferred as energy. (Only a few special chlorophyll can be transferred.
Finally, it is passed to coenzyme NADP. However, due to different concentrations, hydrogen ions obtained by water photolysis move from thylakoid to matrix through the protein complex on thylakoid membrane, and the potential energy between them decreases, which is used to synthesize ATP for dark reaction. At this time, the hydrogen ions with reduced potential energy are taken away by the hydrogen carrier NADP. One NADP molecule can carry two hydrogen ions. This NADPH+H ion acts as a reducing agent in the dark reaction.
Meaning: 1: The photolysis of water (also called photolysis of water) produces oxygen. 2. Convert light energy into chemical energy, generate ATP, and provide energy for dark reaction. 3.NADPH+H ion is synthesized from hydrogen ion, which is the product of water photolysis, and provides reducing agent H (reduced hydrogen) for dark reaction.
(5) Dark reaction (carbon reaction)
The essence is a series of enzymatic reactions.
Conditions: Dark reaction enzyme is acceptable without light (but it is no longer called dark reaction, because only light reaction can continue).
Environment: chloroplast matrix
Influencing factors: temperature, carbon dioxide concentration
Process: Different plants have different dark reaction processes, and the anatomical structure of leaves is also different. This is the result of plants adapting to the environment. Dark reactions can be divided into three types: C3, C4 and cam. These three types are divided according to the different processes of carbon dioxide fixation.
C3 reactive type: Plants suck CO2 into cells from the outside through stomata and enter chloroplasts through free diffusion. Chloroplasts contain C5. It plays a role in fixing carbon dioxide to C3. C3 reacts with energy provided by H and ATP to produce sugar (CH2O) and reduce C5. The reduced C5 continues to participate in the dark reaction.
(6) Chemical equation of light and dark reflection
H2O→H+O2 (photolysis of water)
NADP++2e-+H+ → NADPH (hydrogen transfer)
ADP+Pi→ATP (energy transfer)
CO2+C5 compound →C3 compound (fixed carbon dioxide)
C3 compound →(CH2O)+ C5 compound (formation of organic matter or reduction of C3)
ATP→ADP+PI (energy consumption)
Energy conversion process: light energy → unstable chemical energy (energy is stored in the high-energy phosphate bond of ATP) → stable chemical energy (synthesis of sugar or starch).
Respondents: a 00 1lx- trainee level 11-717:11rose to the first place in the classification.
User name dynamics went up last week.
Old Huzhou 88 2 155
Pijon 1425
The technological origin of truth 780
bigbigeasy 685
Zeng Houyun 665
More >>
Subscribe to this question
Oxygen analyzer manufacturer Beijing Fumeitong Company
Specializing in the production and sales of gas analyzers and other products, including oxygen (O2) analyzer, hydrogen (H2) analyzer, argon (Ar2) analyzer and SF6 analyzer. ..
www.hnarmy.com
Various pressure reducers, oxygen, nitrogen, propane, ..
Xuzhou Banzhou Materials Trading Co., Ltd. specializes in producing and selling air pressure reducers. ..
www.xzbanzhou.com
Oxygen source ozone generator-Tonglin technology
Beijing Tonglin Hi-Tech specializes in producing Tonglin Science and Technology brand ozone generating equipment, which adopts high-temperature resistant intelligent titanium gold structure discharge unit with high ..
www.tonglinkeji.com
Oxygen detection instrument-big dipper instrument
To provide you with modern professional instruments for chemical analysis, physical and chemical detection, environmental detection and industrial analysis, with quick on-site and in-situ analysis and real-time. ..
Www.big dipper.us
Convenient and quick ten thousand pulley small oxygen machine
Changsha Healthy Family specializes in producing small household and medical oxygen machines, which are easy to operate and ready to use without any auxiliary materials. ..
www.jksjzy.com
High-quality Xi An Oxygen Machine Leyuan creates health for you. ..
Xi Anleyuan Medical Devices specializes in the sales and distribution of oxygen machines in Xi 'an, and is the only agent in Admiralty, Kaiyang, Kangshang and other northwest regions. ..
www.leyuan 100.com
Sell oxygen analyzer-Zhengzhou Wigerson
Production and sales of gas analyzer, portable oxygen analyzer, dew point meter, nitrogen detector, oxygen detector, infrared gas analyzer, nitric oxide. ..
www.hgas.cn
Do you want to show the Q&A on Baidu Know on your website? Come and get the free code!
-
If you want to complain or make suggestions, please visit.
Baidu knows about the complaint, right? Feedback.
2008 Baidu