Let s talk about the effect of respiration intensity on cellular respiration what is the evidence ab

Because breathing is lung capacity.

The intrinsic cause is that enzyme activity is determined by genetics.

The same organism has different respiration rates at different stages of growth and development.

Different organs of the same organism have different respiration rates.

Different organisms have different respiration rates.

Cellular respiration is a series of reaction processes catalyzed by enzymes, so cellular respiration is sensitive to changes in temperature. Within a certain range, cellular respiration accelerates with increasing temperature, but after the optimal temperature is exceeded, cellular respiration will weaken sharply until it stops.

Oxygen concentration, oxygen promotes aerobic respiration, inhibits anaerobic respiration, and the intensity of respiration increases with the increase of oxygen concentration within a certain range.

Carbon dioxide concentration, increasing carbon dioxide concentration has an inhibitory effect on aerobic respiration.

Water, within a certain range, the intensity of cellular respiration increases with the increase of water content and decreases with the decrease of water volume.

Factors influencing cellular respiration.

Factors that affect respiration are temperature.

Oxygen concentration, carbon dioxide concentration, water content, etc., the main of which is temperature. Now a few words about the impact of these factors and their application in production practice.

1.Temperature. The respiration is strongest at the optimum temperature (25 35); When the optimal temperature is exceeded, the activity of respiratory enzymes decreases or even denatures and inactivates, and the respiration is inhibited. Below the optimal temperature, enzyme activity decreases and respiration is inhibited.

In production, this principle is often used to store vegetables and fruits at low temperatures. In the cultivation process of greenhouse vegetables, the night temperature should be appropriately cooled, the respiration effect should be inhibited, and the consumption of organic matter should be reduced, which can achieve the purpose of increasing the yield.

2.Oxygen concentration.

When the oxygen concentration is zero, only anaerobic respiration is performed; When the oxygen concentration is less than 10%, both aerobic and anaerobic respiration are performed; When the oxygen concentration is 10% or more, only aerobic respiration is performed.

In daily life, the principle of reducing oxygen concentration can inhibit respiration and reduce organic matter consumption to prolong the freshness of vegetables and fruits. However, in the case of complete anaerobic, anaerobic respiration is strong, and the decomposition of organic matter is more, which is not conducive to the quality and freshness of vegetables and fruits, so it is generally preserved by low oxygen (5%), at this time aerobic respiration is weak, and anaerobic respiration is inhibited.

Soilless cultivation is used to increase the content of oxygen, strengthen the aerobic respiration of the roots, ensure energy, and promote the absorption of mineral elements.

3.Carbon dioxide concentration.

CO2 is produced by respiration, and from the perspective of chemical equilibrium, the concentration of CO2 increases, and the respiration rate decreases.

In a closed cellar, the oxygen concentration is low and the CO2 concentration is high, which inhibits the respiration of the cells and reduces the metabolic level of the entire organ, which is conducive to the preservation of vegetables and fruits.

4.Moisture content.

The various chemical reactions of respiration are carried out in water, the free water content increases, and the metabolism is strengthened.

The storage of grain and oil seeds must reduce the water content and keep the seeds in an air-dried state, so that the respiration is minimized to reduce the consumption of organic matter. If the water content of the seeds is too high, the respiration is strengthened, which increases the temperature in the stored seed pile, which in turn further promotes the respiration of the seeds and deteriorates the quality of the seeds.

Let's first explain about CO2 release and absorption: photosynthesis uses CO2 in cells, respiration produces CO2, in the cell we can think that the CO2 produced by respiration can be directly used for photosynthesis, if the photosynthesis intensity is not strong enough, the CO2 produced by respiration is enough, and there is no need to absorb CO2 from the outside world, and the excess CO2 is released. If it's just enough, it's point B.

At point A, there is no light intensity, there is no photosynthesis, so the CO2 released by respiration is released out of the cell.

A--B With the increase of light intensity, photosynthesis begins to have, but it is still very weak, and the CO2 required is not much. So there is an amount of release, and photosynthesis slowly increases, so there is less and less release.

b The CO2 required for photosynthesis is exactly the amount of CO2 produced by respiration, which can be considered to be the photosynthetic rate equal to the respiration rate.

B--C photosynthesis is getting stronger and stronger, and the respiration is not enough, so it has to be absorbed outside, so the amount of absorption is generated. There is more and more need for it, so the b--c segment is formed.

Point A is the respiration rate of the cell

The amount of CO2 released when the light intensity is zero [Isn't this a product of cellular respiration?] After the light intensity slowly increases, photosynthesis begins and then the photosynthetic rate slowly increases

At this time, organisms no longer need to exchange gases with the outside world, the oxygen produced by photosynthesis is only used for cellular respiration with cells, and the carbon dioxide produced by respiration is only used for cellular photosynthesis

With the increase of light intensity, the rate of photosynthesis exceeds the rate of respiration, and the CO2 produced by respiration is no longer enough for the photosynthesis of cells, so plants have to ingest CO2 from the outside world

The AC segment indicates that the rate of photosynthesis accelerates with the increase of light intensity, the AB segment indicates that the respiration consumption rate of plants is greater than the synthesis rate of photosynthesis, and the C segment indicates that photosynthesis reaches saturation, and the light intensity is not limited to photosynthesis.

The optimal temperature for photosynthesis and respiration in wheat plants was 25 and 30, respectively. Figure A below is a schematic diagram of partial metabolism in wheat mesophyll cells; Figure B is the photosynthesis intensity of wheat leaves measured at a constant CO2 concentration, ambient temperature of 25, and different light intensities. Please answer the questions based on the diagram analysis.

Answer: (1) The intensity of photosynthesis is less than or equal to the intensity of respiration Aerobic respiration reaction (2) Cytoplasmic matrix and mitochondria, chloroplast 20 CO2 concentration (3) Shift up and right.

4) Effect of temperature CO2 concentration on cellular respiration rate Dark.

Cellular respiration is mainly aerobic respiration, which is divided into three stages:

Stage 1: In the cytoplasmic matrix, one molecule of glucose is decomposed into two molecules of pyruvate, and 4 [H] (activated hydrogen) are removed at the same time; During the breakdown of glucose, a small amount of energy is released, and part of the energy is used to synthesize ATP, producing a small amount of ATP. This stage does not require the involvement of oxygen and is carried out in the cytoplasmic matrix.

Reaction formula: C6H12O6 enzyme 2C3H4O3 (pyruvate) + 4[H] + small amount of energy (2ATP) (4[H] is 4NaDH).

Stage 2: Reaction formula: 2C3H4O3 (pyruvate) + 6H2O enzyme 20[H]+6CO2 + small amount of energy (2ATP) (20[H] is 16NaDH and Nadph).

Stage 3: Reaction formula: 24[H]+6O2 enzyme 12H2O+ massive energy (34ATP).

Aerobic respiration: In the first stage of BAI, the glucose of DU1 molecule is broken down into 2 molecules

pyruvate, releasing less DAO

Respiration is divided into aerobic respiration and anaerobic respiration. The process is as follows: