1, location: Chloroplast cells must be present in the photosynthesis part, because chloroplast is the structural basis of photosynthesis, which is figuratively compared to a "machine" for making organic matter. All living cells need to breathe, and cells need to carry out normal life activities when they are alive, but life activities need energy support to be completed normally, and this energy is released by decomposing organic matter through breathing. Without breathing, cells cannot survive normally, and they will.

2. Conditions: Photosynthesis needs light, because photosynthesis converts light energy into chemical energy and stores it in organic matter, where light energy plays a dynamic role. Breathing has nothing to do with light. Cells need energy as long as they live normally day and night, so they have to rely on breathing to provide energy.

3. Raw materials: According to the concepts of photosynthesis and respiration, we know that the raw materials of photosynthesis are carbon dioxide and water, and the raw materials of respiration are organic matter and oxygen.

4. Products: According to the concepts of photosynthesis and respiration, the products of photosynthesis are organic matter and oxygen, and the products of respiration are carbon dioxide and water.

5. Energy conversion: From the essence of photosynthesis and respiration, we can know that photosynthesis is to make organic matter and convert light energy into chemical energy for storage; Respiratory function is to decompose organic matter, release chemical energy in organic matter for life activities, and a small part is lost in the form of heat.

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Synthetic substances store energy, while decomposed substances release energy; But it is also inseparable from anyone: the absorption of raw materials and the transportation of products in photosynthesis are provided by respiration, and the organic matter decomposed by respiration is produced by photosynthesis. The energy stored in photosynthesis is released through respiration, so they are interdependent.

Extended data:

The earliest photosynthesis

1990, a red algae fossil was found in the Canadian Arctic. This kind of red algae is the first known sexually propagated species on the earth, and it is also considered as the oldest ancestor of modern animals and plants. Before, there was no unified view on the age of red algae fossils. Most people thought that they lived 65.438+0.2 billion years ago.

In order to determine the age of this red algae fossil, the researchers went to baffin island to collect the black shale containing this red algae fossil, and analyzed its rhenium-osmium isotope dating. It is considered that the history of red algae fossils is 65.438+0.47 billion years. ?

On the basis of confirming the age of red algae fossils, the researchers used a mathematical model called "molecular clock" to calculate biological evolution events according to the mutation rate of genes. Their conclusion is that about 654.38+0.25 billion years ago, eukaryotes began to evolve chlorophyll which can be used for photosynthesis.

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