How do you explain photosynthesis or transpiration in plant leaves?

The process in which a large number of chloroplasts contained in leaves produce organic matter such as starch when exposed to sunlight, i.e., photosynthesis. Leaves also contain a large number of stomata, and the process through which plants absorb oxygen and excrete carbon dioxide is called respiration. The effect of plants emitting water to regulate the temperature and water of their surroundings and self-growth is called transpiration.

PlantsPhotosynthesisLeaning on the leavesChlorophyll。Chlorophyll, the main pigment for photosynthesis in plants, is a family of lipid-containing pigments, located in:ThyloidsMembrane. Chlorophyll absorbs most of the red and violet light but reflects green light, so chlorophyll is green, and it plays a central role in the light absorption of photosynthesis.

Chlorophyll is magnesium porphyrin.

Compounds, including chlorophyll a, b, c, d, f, as well as protochlorophyll and bacterial chlorophyll macrostools, etc. Chlorophyll is not very stable, and light, acid, alkali, oxygen, oxidants, etc., will decompose it. Under acidic conditions, the chlorophyll molecule easily loses the magnesium in the porphyrin ring and becomes the chlorophyllian reflux.

Photosynthesis process

The process of photosynthesis is a more complex problem, and on the surface, the total reaction formula of photosynthesis seems to be a simple redox.

process, but essentially consists of a series of photochemical steps and the problem of side-roll transitions of species.

According to modern data, the whole process of photosynthesis can be roughly divided into the following three steps. primary reactions, including the absorption, transfer, and conversion of light energy; Electron transport and photosynthetic phosphorylation to form active chemical energy.

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.

Plants need light for photosynthesis.

Plants use the energy of light to convert carbon dioxide and water into sugar, but plants only accept light in the range of 380nm-780nm, which is called PAR. If the plant is shaded, photosynthesis will continue but not reach the optimal state, the plant can not maximize the production of sugar, usually in agricultural production activities, we need to maintain healthy plants and fruits with the sweetness standard under the premise of ensuring light intensity, such as Xinjiang because of the long sunshine time, so cantaloupe will be sweeter.

Photosynthesis: It is the synthesis of light energy, which is a biochemical process in which plants, algae and some bacteria, under visible irradiation, through light reaction and dark reaction, use photosynthetic pigments to convert carbon dioxide and water into organic matter, convert light energy into chemical energy and store it in organic matter, and release oxygen removal.

Photosynthesis

Photosynthesis is the process by which green plants (including algae) absorb light energy, synthesize carbon dioxide and water into energetic organic matter, and release oxygen at the same time, under the conditions of photopigment molecular enzymes, carbon dioxide (or hydrogen sulfide).

Photosynthesis mainly includes two stages: light reaction and dark reaction, which is of great significance for realizing the energy conversion in nature and maintaining the carbon and oxygen balance of the atmosphere.

The most important products of photosynthesis are carbohydrates, which include monosaccharides, disaccharides and polysaccharides. The most prevalent monosaccharides are glucose and fructose; Disaccharides are sucrose; Polysaccharides are starches. In the leaves, glucose is often converted into starch and stored temporarily.

However, some plants such as onions, garlic and other leaves do not form starch in photosynthesis, only sugars.

In addition to carbohydrates, the products of photosynthesis include lipids, organic acids, amino acids and proteins. The quality and quantity of various photosynthetic products were different under different conditions, for example, more nitrogen fertilizer and more protein formation, less nitrogen fertilizer, more sugar formation and less protein formation; When plants are young, protein is formed more in the leaves, and with age, the formation of sugar increases. Different light waves, such as blue-violet light, synthesize more protein, and wheat in mountainous areas has high protein content and good texture, while more carbohydrates are synthesized under red light.

Plant photosynthesis is a biochemical process that is the basis for the survival of the biological world. Plant photosynthesis refers to the biochemical process in which plants absorb light energy, convert carbon dioxide or hydrogen sulfide and water into organic matter, and release oxygen or hydrogen. Plant photosynthesis is also known as photosynthesis.

Introduction to photosynthesis.

Photosynthesis is divided into two stages: light reaction and dark reaction, and the organic matter produced by photosynthesis is mainly carbohydrates and releases energy. Photosynthesis of plants occurs in chloroplasts and photosynthetic bacteria of green plants, involving important reaction steps such as light absorption, electron transfer, photosynthetic phosphorylation, and carbon assimilation, which helps to regulate the atmospheric carbon-oxygen balance, and is of great significance for realizing the energy conversion in nature and maintaining the atmospheric carbon-oxygen balance.

While assimilating inorganic carbides, plants convert solar energy into chemical energy, which is stored in the organic compounds formed. The solar energy assimilated by photosynthesis is about 10 times the amount of energy required by humans every year. The chemical energy stored in organic matter, in addition to the use of the plant itself and all heterotrophs, is more important for the energy of human nutrition and activity**.

Biology knowledge for junior high school: A short animated film will take you to understand the principle of photosynthesis in plants.

The product of photosynthesis in plants is organic matter, which is used to store energy and oxygen.

There is oxygen after the consumption of carbon dioxide.

Products of photosynthesis The carbohydrates made by photosynthesis are first of all glucose, but glucose soon turns into starch, which is temporarily stored in chloroplasts and later transported to various parts of the plant body.

Under the exposure of sunlight, green plants absorb carbon dioxide and water from the outside world, and use light energy to produce organic matter mainly carbohydrates and release oxygen in chloroplasts. At the same time, light energy is converted into chemical energy and stored in the organic matter produced. This process is called photosynthesis.

The reaction formula of photosynthesis can be expressed by the following formula: 6CO2+6H2O=C6H12O6+6O2

The organic matter produced by photosynthesis, except for a part used to build the plant body and respiration consumption, is mostly transported to the storage organs of the plant body for storage, and the food and vegetables we eat are these stored organic matter. Therefore, the products of photosynthesis are not only necessary for the life activities of plants themselves, but also directly or indirectly serve other organisms (including humans) and are used by these organisms. The oxygen produced by photosynthesis is also one of the most abundant oxygen in the atmosphere.

There are three: 1. Reducing hydrogen 2, oxygen 3, glucose chemical reaction 6CO2 + 6H2O = C6H12O6 + 6O2

Oxygen products, of course, are oxygen.

12H2O + 6CO2 = (Light) C6H12O6 (Glucose) +6O2+ 6H2O

Light is a catalyst and does not participate in the reaction.

The difference between photosynthesis and respiration and the comparison content: photosynthesis Respiration is different from the conditions for light to take place (during the day).

Light-independent (day, night) places are carried out only in cells with chloroplasts.

In all living cells, it is possible to produce raw carbon dioxide and water.

Organic matter, oxygen products, organic matter, oxygen.

Carbon dioxide and water inhale carbon dioxide and release oxygen.

Inhale oxygen and release carbon dioxide.

As a result, organic matter is produced and energy is stored.

Decomposition of organic matter, release of energy connectionNo photosynthesis to make organic matter, respiration is impossible (because there are no raw materials), and without respiration to release energy, photosynthesis is also impossible (because it cannot absorb raw materials and transport products), so the two are interdependent.

Transpiration also has some effects on plant life activities: first, it is a major driving force for plants to passively absorb water, which can promote water absorption and water conduction by plants. Secondly, transpiration causes water to flow through the plant to provide a transport system, with mineral salts being transported from the roots to the upper part of the plant with the water, and organic matter being transported in the plant.

Thirdly, transpiration can also effectively reduce the temperature of leaves, and in strong sunlight, heat dissipation through transpiration can maintain a physiologically appropriate body temperature of plants.

The stomata are the gateways through which plant leaves exchange gases with the outside world. In the process of photosynthesis, plants must exchange gases with their surroundings; At the same time, transpiration through the stomata also causes the plant to lose a lot of water. Transpiration is the vaporization of water and is a physical process.

The intensity of transpiration is not only affected by the environment (e.g., temperature and humidity), but also by the stomatal switch. The function of the stomatal switch is mainly to minimize the consumption of water to meet the CO2 needs of plants for photosynthesis as much as possible. Therefore, the biological significance of transpiration can only be said to be the price that terrestrial plants have to pay in the process of photosynthesis with very low concentrations of CO2 as raw materials to produce organic matter and build their bodies in the atmosphere where water vapor is usually unsaturated.

Anyone who has taken a biology class will know that plants will photosynthesize when they meet sunlight, and photosynthesis will inhale carbon dioxide from the air and then remove oxygen and water. The sun is needed for everything to grow, and without light there is no living thing. So why do plants photosynthesize?

I believe that many friends still don't know much about it, so I'll give you a detailed introduction below.

Light is the ultimate energy of all living beings. "Everything grows on the sun", without light there is no everything.

In the process of biological evolution, only plants can photosynthesize, it is biologically evolved'The product is the main component of the ecosystem, which realizes the transformation from inorganic to organic, realizes the conversion of light energy into chemical energy, and finally converts it into organic matter for storage, all of which are closely related to its evolutionary structure.

It is the chloroplasts in the mesophyll cells that contain the pigments that perform photosynthesis on them. These pigments convert light energy. Without light, these pigments lose their meaning. So when plants have light, they will photosynthesize and their structure is related.