The factors that limit photosynthesis in plants are ranked from largest to smallest

1. Care, 2. Moisture and carbon dioxide, 3. Temperature, 4. Other factors.

Photosynthesis is a photobiochemical reaction, so the photosynthetic rate accelerates as the light intensity increases. But beyond a certain range, the increase in photosynthetic rate slows down until it no longer increases. The photosynthetic rate can be expressed in terms of the amount of CO2 absorbed, and the greater the amount of CO2 absorbed, the faster the photosynthetic rate.

Carbon dioxide. CO2 is the raw material for photosynthesis of green plants, and its concentration affects the dark reaction of photosynthesis. Increasing the concentration of CO2 within a certain range can increase the rate of photosynthesis, and the rate of photosynthesis does not increase after the concentration of CO2 reaches a certain value, because the products of the photoreaction are limited.

Temperature. The effect of temperature on photosynthesis is complex. Since photosynthesis consists of two parts, light reaction and dark reaction, light reaction mainly involves photophysical and.

The photochemical reaction process, especially the steps that are directly related to light, does not include enzymatic reactions, so the photoreaction part is less affected by temperature, or even not affected by temperature; The dark reaction is a series of enzymatic reactions, which are obviously affected and restricted by temperature changes.

When the temperature is higher than the optimal temperature for photosynthesis, the photosynthetic rate obviously decreases with the increase of temperature, which is due to the passivation, denaturation and even destruction of the relevant enzymes that catalyze the dark reaction caused by high temperature, and the chloroplast structure will be changed and damaged by high temperature. The high temperature aggravates the respiration of plants, and the decrease in carbon dioxide solubility exceeds the decrease in oxygen solubility, which is conducive to photorespiration and not conducive to photosynthesis. At high temperatures, the transpiration rate of the leaves increases, the leaves lose water seriously, resulting in the closure of the stomata and the lack of carbon dioxide, and the combined effect of these factors will inevitably lead to a sharp decrease in the photosynthetic rate. When the temperature rises to the thermal limit, the net photosynthetic rate drops to zero, and if the temperature continues to rise, the leaves will wilt and even dry up and die due to severe water loss.

Mineral elements. Mineral elements directly or indirectly affect photosynthesis. For example, N is the element that makes up the compounds of chlorophyll, enzymes, ATP, P is the element that makes up ATP, and Mg is the element that makes up chlorophyll.

Moisture content. Water is not only one of the raw materials for photosynthesis, but also affects the opening and closing of leaf stomata and indirectly affects the absorption of CO2. The lack of water decreases the photosynthetic rate.

Atmospheric electric field. The atmospheric electric field is being used in production as a newly discovered regulator of photosynthesis. The positive atmospheric electric field promotes the photosynthesis of plants and lowers the light saturation point. The negative atmospheric electric field, on the other hand, promotes respiration.

The space electric field that artificially simulates the change of atmospheric electric field is used for the regulation of photosynthesis of plants, and is also used in the production process of high-sweetness fruit-based radish. The combination of space electric field and carbon dioxide supplementation can promote plant growth and increase the sweetness of root vegetables. The regulation of plant growth by space electric field is an important aspect of the biological effect of space electric field.

These conditions are mutually restrictive, and it is difficult to say how much they will play in addition to these external conditions, but also to consider the internal factors of the plant itself, and so on. But the most basic condition for photosynthesis is to have light.

Illumination, carbon dioxide, temperature, mineral elements, moisture.

a) Lighting. Light is the energy source of photosynthesis, so light is necessary for photosynthesis.

b) Carbon dioxide.

The carbon source required for photosynthesis of terrestrial plants is mainly carbon dioxide in the air.

Carbon dioxide is the raw material for photosynthesis and has a great influence on the photosynthetic rate.

c) Temperature. The dark reaction in the photosynthetic process is a chemical reaction catalyzed by enzymes, and temperature directly affects the activity of enzymes, therefore, temperature also has a great influence on photosynthesis.

4) Mineral elements.

Mineral elements directly or indirectly affect photosynthesis.

e) Moisture.

If the planting density of plants is too large, the branches and leaves will weaken the bridge of the plant because the branches and leaves block the external factorsPhotosynthesis

m-point, the light intensity.

is 0, at this time the plant only performs respiration; At point n, it means that the photosynthetic rate is equal to the respiration rate; Before the P point, the three curves coincide, indicating that the limiting factor of the MP segment was mainly the light intensity. However, the trends of the three curves in the pq segment were different, and the limiting factors were light intensity and p-point, and the photosynthetic rate did not increase anymore, indicating that the limiting factor was mainly carbon dioxide.

Concentration. <>

Academic paraphrasingFor the sake of description, the following are referred to as photosynthetic rate. There were little changes in the respiration efficacy, net photosynthetic rate and total elimination of pure photosynthetic rate and percentage among different provenances. The ability of plants to absorb carbon dioxide during photosynthesis is called photosynthetic rate, also known as net photosynthetic intensity or net carbon dioxide assimilation rate.

The higher the photosynthetic rate, the more carbon dioxide the plant absorbs during photosynthesis and makes carbohydrates.

The more you have, the higher the yield.

Factors such as light intensity, CO2 concentration, temperature, and moisture can affect the photosynthesis of plants.

Photosynthesis usually refers to the process by which green plants absorb light energy, combine carbon dioxide and water into energetic organic matter, and release oxygen at the same time.

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 the basal spring releases energy.

The reason why the atmosphere can maintain 21% of its oxygen content on a regular basis is mainly dependent on photosynthesis. On the one hand, photosynthesis provides the conditions for aerobic respiration, and on the other hand, the accumulation of carbon dioxide gradually forms the ozone layer on the surface of the atmosphere. The ozone layer absorbs the intense ultraviolet radiation from sunlight that is harmful to living organisms.

Although plant photosynthesis removes a large amount of the atmosphere, the concentration in the atmosphere is still increasing, mainly due to urbanization and industrialization.

(1) Light intensity is an external factor affecting photosynthesis, which mainly affects the photolysis of water and the formation of ATP in the photoreaction stage If X represents the light intensity, with the increase of light intensity, the more [H] and ATP generated by the light reaction, the photosynthesis will gradually increase; However, due to the limitation of intrinsic factors, such as the content of pigments, the activity of enzymes, etc., photosynthesis will reach the saturation point, which corresponds to the curve a in the figure

2) The internal factors that limit photosynthesis are: enzyme activity, the number of pigments, the content of five-carbon compounds, etc

Since pigments have the role of absorbing, transmitting, and converting light energy, the main internal factor limiting the absorption of light energy is the number of pigments

Carbon dioxide is mainly used for the fixation of carbon dioxide in dark reactions, i.e. carbon dioxide and five-carbon compounds are fixed into three-carbon compounds, so when CO2

When the concentration affects the photosynthetic rate to a maximum, the limiting factor is most likely the content of the five-carbon compounds

3) According to the title, the independent variable of the experiment is temperature, and the dependent variable is the intensity of photosynthesis, so the principle of this experiment is as follows: temperature mainly affects the intensity of photosynthesis by affecting the activity of the enzyme that undertakes photosynthesis; The amount of oxygen produced by photosynthesis over a certain period of time reflects the intensity of photosynthesis

During the experiment, the O2 produced by photosynthesis over a certain period of time can be observed

The number of bubbles to judge the intensity of photosynthesis

So the answer is: (1) a photoreaction.

2) b The amount of pigments in the content of the five-carbon compound.

3) aTemperature mainly affects the intensity of photosynthesis by affecting the activity of the enzyme that undertakes photosynthesis.

b The amount of oxygen produced by photosynthesis within a certain period of time can reflect the intensity of photosynthesis.

O2 produced by photosynthesis in a certain period of time

Number of bubbles.

1.The first is to have chloroplasts, which are the places of reaction; The second is the right temperature and sufficient light, which are the conditions for the reaction; Then there's plenty of carbon dioxide and water, which are reactants! When all the conditions are right, photosynthesis can proceed smoothly!

Photosynthesis is usually the process by which green plants (including algae) absorb light energy and synthesize carbon dioxide and water into energetic organic matter while releasing oxygen.

2.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.

You should have an option for this, and you can't make a choice without an option, and you can only give you a brief description of photosynthesis.

Plant photosynthesis (photosynthesis), that is, photosynthesis, is a biochemical process in which plants, algae and some bacteria use photosynthetic pigments to convert carbon dioxide (or hydrogen sulfide) and water into organic matter and release oxygen (or hydrogen) under the irradiation of visible light. Photosynthesis is the sum of a series of complex metabolic reactions, which is the basis for the survival of the biological world and an important medium of the earth's carbon and oxygen cycle. Photosynthesis) is the use of photosynthetic pigments such as chlorophyll by green plants and the use of their cells by certain bacteria such as halophilic archaea with purple membranes.

A biochemical process in which carbon dioxide and water (hydrogen sulfide and water for bacteria) are converted into organic matter and oxygen (hydrogen is released by bacteria) under the irradiation of visible light. Plants are called producers of the food chain because of their ability to produce organic matter from inorganic matter and store energy through photosynthesis. Through consumption, consumers in the food chain can absorb the energy stored by plants and bacteria with an efficiency of about 10% to 20%.

For almost all living beings in the biological world, this process is the key to their survival. And in the carbon-oxygen cycle on Earth, photosynthesis (which keeps oxygen and carbon dioxide levels relatively stable) is essential.

1) In the curve of Figure B, only respiration is carried out before 6 o'clock in the morning, and the soybean seedlings begin to photosynthesize at 6 o'clock, so the reduction of oxygen in the small room gradually decreases at 6-8 h At point B, the photosynthetic rate reaches the highest time of the day, if the soybean seedlings under the light at point B are moved to the dark, the light reaction is immediately blocked, and the ATP and [H] produced are reduced, thereby inhibiting the reduction of C3 in the dark reaction, resulting in an increase in the content of C3 in chloroplasts in their cells (2) Since magnesium is the main component of chlorophyll synthesis, if soybean seedlings are cultured in a full nutrient solution with magnesium deficiency, the chlorophyll content of soybean seedlings will decrease, the photosynthetic rate will be slowed down, and respiration will not be affected, so point A in the curve of Figure B will shift to the right (3) Due to the high sunlight time and light intensity of Baisui in Xinjiang, more organic matter is synthesized during the day, and the temperature at night is low, and the organic matter consumed by respiration at night is less, so more organic matter is accumulated in a day. (4) Because the way in which root cells absorb inorganic salts is active transport, active transport requires energy consumption, and loose soil can promote aerobic respiration and energy supply of root cells Therefore, the answer is: (1) soybean seedlings begin to photosynthesize (2) right Lack of chlorophyll in plants (3) Light time (light intensity) and temperature difference between day and night (4) Promote aerobic respiration of roots and absorption of inorganic salt ions by roots.

Summary. Hello dear, I am happy to answer for you, for the effect of light intensity on the photosynthesis of green plants, it is usually not necessary to switch to different kinds of plants. This is because light intensity has a general effect on the photosynthesis of green plants and is not limited to specific plant species.

Dear, hello, I am glad to answer for you, the influence of light intensity on photosynthesis of green plants is not necessary, and it is usually not necessary to switch to different kinds of plants. This is because light intensity has a general effect on the photosynthesis of green plants, and is not limited to specific plant species.

Through photosynthesis, green plants convert light energy into chemical energy to produce nutrients and energy. Changes in light intensity have a direct impact on the rate and efficiency of photosynthesis. Stronger light can provide more energy and promote the progress of photosynthesis, while weaker light restricts the progress of photosynthesis.

The relationship between photosynthesis and respiration is:

Photosynthesis in plants can only be carried out under the condition of a bucket finger with light, whereas respiration can be carried out under any conditions

So the answer is: