The reaction of photosynthesis has evidence of the involvement of two light systems which are 20

Because it has been confirmed that photosynthesis produces oxygen.

Then we put the two pots of plants into a sealed glass, one pot in the sun, one pot in the dark, after a while, we will find that the plants in the dark die, the plants without light and the plants with light are respiratory, and the plants without light die (because the energy is exhausted) and the ones with light will not, because there is light energy to carry out light and action, and produce energy substances (starch).

First of all, H2O18 found that a cycle is a light reaction in which water produces oxygen, and the necessary condition for this reaction is light.

In the case of not giving sunlight to plants, it was found that polysaccharides were still being produced in plants, and the reaction was a dark reaction, Calvin cycle.

The photochemical reactions regarding photosynthesis are described as follows:

Also known as photochemical reaction or actinization. A chemical reaction of a substance is generally produced by the exposure of visible light or ultraviolet light. In the environment, it is mainly irradiated by sunlight, and pollutants absorb photons and make the molecules of the substance in a certain electron excited state, which causes chemical reactions with other substances.

For example, the initial reaction of photochemical smog formation is a photochemical reaction in which nitrogen dioxide (NO2) absorbs ultraviolet rays (wavelength 2900 4300A) and decomposes into nitric oxide (NO) and atomic oxygen (O, triplet) under sunlight, and its reaction formula is NO2+, which starts the chain reaction, resulting in a series of reactions with ozone and other organic hydrocarbon compounds, and finally produces toxic products of photochemical smog.

Photochemical reactions can cause processes such as compounding, decomposition, ionization, redox, etc. It can be divided into two categories: one is photosynthesis, such as green plants make carbon dioxide and water absorb light energy and synthesize carbohydrates with the help of plant chlorophyll under sunlight.

The other is photodecomposition, such as the absorption of ultraviolet rays by molecular oxygen in the upper atmosphere and the decomposition of atomic oxygen; The fading of dyes in the air, the photosensitive effect of film, etc. The chemical principle of air pollution is more complex, in addition to being related to the general law of chemical reactions, it is more due to the fact that the substances in the atmosphere absorb the radiation energy (photons) from the sun and undergo photochemical reactions.

Makes a pollutant more toxic (called a secondary pollutant). A photochemical reaction is a reaction initiated by the absorption of photons by the molecules of a substance. When a molecule absorbs a photon, the electrons inside it undergo an energy level transition, forming an unstable excited state, and then further dissociation or other reactions occur.

The reaction of photosynthesis is: water + carbon dioxide organic matter + oxygen

Photosynthesis is the most basic material metabolism and energy metabolism of living organisms, and the energy fixed and the organic matter formed by it are almost the direct or indirect substances and energy of all living beings**. It occupies a very important position in the college entrance examination, and the following summarizes the knowledge points of photosynthesis.

The concept of photosynthesis, the reaction formula, and its process.

Photosynthesis refers to the process in which green plants use light energy to convert carbon dioxide and water into organic matter that stores energy and release oxygen.

Total reaction formula: CO2+H2O (CH2O)+O2

The following points should be paid attention to in reactive writing:

1) Photosynthesis has water decomposition, although the product side of the reaction does not write water, but there is actually water generation;

2)" cannot be written as "=".

The concept and reaction formula of photosynthesis should be grasped from the place of photosynthesis - chloroplasts, conditions - light energy, raw materials - carbon dioxide and water, products - sugars and other organic matter and oxygen.

The process of photosynthesis.

Photoreaction Phase:

a. Photolysis of water: 2H2O 4[H]+O2 (providing hydrogen for dark reactions);

b. Formation of ATP: ADP + PI + light energy ATP (providing energy for dark reactions).

Dark Reaction Phase:

A. Fixation of CO2: CO2+C5 2C3;

B. Reduction of C3 compounds: 2C3+[H]+ATP (CH2O)+C5 Review the photosynthesis process.

1. Photosynthesis usually refers to the process in which green plants (including algae) absorb light energy, synthesize carbon dioxide and water into energetic organic matter, and release oxygen at the same time. It mainly includes two stages: light reaction and dark reaction, which involves important reaction steps such as light absorption, electron transfer, photosynthetic phosphorylation, and carbon assimilation, which is of great significance for realizing the energy conversion in nature and maintaining the carbon-oxygen balance of the atmosphere.

2. The process of photosynthesis is a relatively complex problem, on the surface, the total reaction formula of photosynthesis seems to be a simple redox process, but in essence it includes a series of photochemical steps and material transformation problems. According to modern data, the whole photosynthesis can be roughly divided into the following three major steps: primary reaction, including the absorption, transfer and conversion of light energy; electron transport and photosynthetic phosphorylation to form active chemical energies (ATP and Nadph); Carbon assimilation, which converts active chemical energy into stable chemical energy (fixation of CO2 and formation of sugars).

Before introducing the photosynthesis reaction process, it is necessary to have a certain understanding of the photosynthetic pigments and photosystems involved in the photosynthesis process.

The whole process of optical rubber leakage synthesis requires the participation of light in the sliding cavity. （）

a.The right beam lets rot.

b.Mistake. Correct answer: B

Photosynthesis usually refers to the process by which green plants absorb light energy, synthesize carbon dioxide (CO2) and water (H2O) into energetic organic matter, and release oxygen at the same time. So, what is the total reaction formula of photosynthesis? Below I have compiled some relevant information for your reference!

The process by which green plants use the sun's light energy to assimilate carbon dioxide and water to make organic matter and release oxygen is called photosynthesis. The organic matter produced by photosynthesis is mainly carbohydrates and releases energy.

The total reaction formula of photosynthesis: CO2 H2O photochloroplast CH2O O2 (δGO'

This reaction formula states that plant photosynthesis is the process of assimilating CO2 and releasing O2 using light energy, and that about 480 kJ of energy is converted and stored for every 1 mol of CO2 (12 grams of carbon) fixed, and that chloroplasts are the site of photosynthesis.

1) Light intensity: As the light intensifies, photosynthesis intensifies. But when the light is increased to a certain extent, photosynthesis is no longer enhanced.

At noon in summer, due to the stomatal closure of the world, which affects the entry of carbon dioxide, the intensity of photosynthesis decreases, so the strongest light at noon is not the strongest time for photosynthesis.

2) Carbon monoxide concentration: Carbon dioxide is the raw material for photosynthesis, and its concentration affects the intensity of photosynthesis. Greenhouse cultivation can appropriately increase the concentration of carbon dioxide in the greenhouse to increase yield.

3) Temperature: Plants carry out photosynthesis normally under the condition of 10 35, of which 25 30 is the most suitable, and the intensity of photosynthesis above 35 begins to decline or even stop.

1. Transform inorganic matter into organic matter. About 51 011 tonnes of organic matter are synthesized annually and can be used directly or indirectly as food for humans or the animal kingdom, and it is estimated that the autotrophic plants on Earth assimilate about 21 011 tonnes of carbon a year through photosynthesis, of which 40 are assimilated by phytoplankton and the remaining 60 by terrestrial plants;

2. Convert light energy into chemical energy, green plants convert sunlight into chemical energy in the process of assimilating carbon dioxide, and accumulate it in the formed organic compounds. The energy used by human beings, such as coal, natural gas, wood, etc., is formed by the plants of the present or the past through photosynthesis;

3. Maintain the relative balance of atmospheric O2 and CO2. On Earth, about tons of O2 are consumed per year due to biological respiration and combustion, and at this rate, the O2 contained in the atmosphere will be depleted around 3000 years. However, green plants absorb CO2 and release tons of O2 per year, so the O2 content in the atmosphere remains at 21.

The total reaction formula of photosynthesis: CO2 H2O photochloroplast CH2O O2 (δGO', the meaning of photosynthesis: the conversion of light energy into chemical energy, green plants in the process of assimilation of carbon dioxide, the conversion of sunlight into chemical energy, and the accumulation of organic stool compounds.

The energy used by humans, such as coal, natural gas, wood, etc., is formed by plants in the present or past through photosynthesis. The total reaction formula of photosynthesis of Yuqiao Brigade: CO2 H2O photochloroplast CH2O O2 (δgo', the meaning of photosynthesis:

Converting light energy into chemical energy, green plants convert sunlight into chemical energy in the process of assimilating carbon dioxide, and accumulate in the formation. organic compounds. The energy used by human wide dust, such as coal, natural gas, wood, etc., is formed by current or past plants through photosynthesis.

The site where the light reaction takes place in photosynthesis is the thylakoid membrane of the chloroplast.

A light reaction is a reaction that occurs only when exposed to light and is caused by light. The light reaction takes place in the thylakoid membrane (photosynthetic membrane) of chloroplasts. The photoreaction starts from the photosynthetic pigment absorbing light energy excitation, through the photolysis of water, electron transfer, and finally the light energy is converted into chemical energy, which is stored in the form of ATP and Nadph.

The photoreaction is also known as the photosythenic electron-transfer reaction. During the reaction, the light energy from the sun causes the chlorophyll of green organisms to produce high-energy electrons, which convert light energy into electrical energy. Then, the electrons are transported between the electron transport chains in the chloroplast thylakoid membrane, and the H+ protons are transferred from the chloroplast matrix to the thylakoid lumen, and the electrochemical proton gradient is established for the synthesis of ATP in the chamber.

The last step in the light reaction is when the energetic electrons are accepted by NadP+, allowing them to be reduced to Nadph. The site of the light reaction is thylakoids. To be precise, the light reaction is the process of absorbing light energy through photosynthetic pigment molecules such as chlorophyll and converting the light energy into chemical energy, forming ATP and Nadph.

The photoreaction consists of three main steps: light energy absorption, electron transport, and photosynthetic phosphorylation.