Where does the oxygen for the respiration of the roots come from?

Photosynthesis is the synthesis of water and oxygen (CH2O)N by plants, i.e. starch, glucose, etc. Aerobic respiration breaks down organic matter, such as glucose, in the mitochondrial and cytoplasmic matrix of the cell. Animals and plants can have this aerobic respiration (e.g. jogging, and normal, non-strenuous exercise) There's a lot more to know about this, and it's hard for me to type, if you're interested in grading me and want to know more, send me a message and I can teach you how to do it.

The process of photosynthesis:1Photoreaction stage The chemical reaction in the first stage of photosynthesis must have light energy to proceed, and this stage is called the photoreaction stage.

The chemical reaction in the photoreaction stage is carried out on the thylakoids within the chloroplast. Dark Reaction Phase The chemical reaction in the second phase of photosynthesis can be carried out without light energy, and this stage is called the dark reaction phase. The chemical reactions in the dark reaction phase are carried out in the matrix within the chloroplast.

The light reaction stage and the dark reaction stage are a whole, and in the process of photosynthesis, the two are closely related and indispensable. 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. We are inhaling the oxygen released by photosynthesis all the time.

The food we eat every day also comes directly or indirectly from organic matter produced by photosynthesis. So, how was photosynthesis discovered? The discovery of photosynthesis Until the mid-18th century, people thought that all the nutrients in plants were obtained from the soil, and it was not thought that plants could get anything from the air.

In 1771, the British scientist Priestley discovered that the candle was not easily extinguished by placing the lit candle in a closed glass cover with the greenery; Place the mouse inside a glass cover with greenery, and the mouse is also not easily suffocated. Thus, he points out that plants can renew the air. However, he did not know what composition of the air was renewed by the plants, nor did he discover the key role that light played in this process.

Later, after many scientists' experiments, the places, conditions, raw materials and products of photosynthesis were gradually discovered. Here are a few of the famous experiments. In 1864, the German scientist Sachs did such an experiment:

Keep the green leaves in the dark for a few hours to allow the nutrients in the leaves to be depleted. Then put half of this blade** and the other half shaded. After a period of time, the leaves were treated with iodine vapor, and it was found that the shading half of the leaves did not change color, and the ** half of the leaves was dark blue.

This experiment successfully demonstrated that green leaves produce starch during photosynthesis.

The soil is an aggregate structure, and oxygen is present at great depths.

Humans and animals breathe oxygen** from plants.

The green leaves of plants use chlorophyll to convert carbon dioxide absorbed in the air and water transported from the roots into organic matter such as starch and glucose, and release oxygen. This process is called photosynthesis. It has been calculated that the amount of carbon dioxide absorbed by three large eucalyptus trees per day is equivalent to the amount of carbon dioxide that one person exhales every day.

Every year, the world's green plants absorb tens of billions of tons of carbon dioxide from the air and produce the corresponding amount of oxygen. It is precisely because of the hard work and cultivation of green plants that there will be a steady stream of oxygen for us, so that we can survive.

1. The oxygen in carbon dioxide comes from glucose, and the oxygen in water comes from oxygen.

2. Because the oxygen in carbon dioxide is the first propionate ketone and water in the second stage, and the propionate ketone comes from the glucose in the first stage, the oxygen in the carbon dioxide comes from the glucose. The oxygen in the water is generated by the combination of [H] (reducing agent hydrogen) produced in the first and second stages of aerobic respiration and the oxygen conditions in aerobic respiration, so the oxygen in the water comes from oxygen.