Oxygen in atmosphere has been formed by :a)Evporation of waterb)Photosynthesis of plantsc)Metabolism of microorganismsd)Decaying organismsCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Today phytoplankton and terrestrial green plants maintain a steady balance in the amount of the earth's atmospheric oxygen....a mature forest takes in carbon dioxide from the atmosphere during photosynthesis and converts it to oxygen to support new growth.....

Answer

Option B is correct. Oxygen is formed during photosynthesis so we can say that oxygen in atmosphere has been formed by photosynthesis of plants.

Answer

Source of oxygen to the atmosphere is photosynthetic organisms. Photosynthetic organisms, by performing photosynthesis, release oxygen into the atmosphere. So, oxygen in the atmosphere has been formed by Photosynthetic organisms. eg: Green plants, algae, cyanobacteria.

So, the correct option is ‘Photosynthesis of plants’.

Answer

Oxygen in the atmosphere has been formed by photosynthesis of plants.

Photosynthesis is the process by which plants, algae, and some bacteria convert sunlight, carbon dioxide, and water into glucose and oxygen. It is the primary source of oxygen in the Earth's atmosphere. Let's explore this process in detail.

1. Photosynthesis:
Photosynthesis is a complex biochemical process that occurs in the chloroplasts of plant cells. It can be summarized by the following equation:
6CO2 + 6H2O + sunlight → C6H12O6 + 6O2

2. Chloroplasts:
Chloroplasts are the organelles in plant cells responsible for photosynthesis. They contain a pigment called chlorophyll, which absorbs sunlight and initiates the photosynthetic process.

3. Light-dependent reactions:
In the first stage of photosynthesis, known as the light-dependent reactions, sunlight is absorbed by chlorophyll. This energy is then used to split water molecules into oxygen and hydrogen ions. Oxygen gas (O2) is released into the atmosphere as a byproduct, while the hydrogen ions are used in the next stage.

4. Light-independent reactions:
The second stage of photosynthesis, known as the light-independent reactions or the Calvin cycle, involves the conversion of carbon dioxide (CO2) into glucose (C6H12O6). This process utilizes the hydrogen ions produced in the light-dependent reactions, along with ATP (adenosine triphosphate) generated from the absorbed sunlight.

5. Oxygen production:
During photosynthesis, plants release oxygen gas into the atmosphere as a byproduct of the light-dependent reactions. This oxygen accumulates and contributes to the overall oxygen content in the Earth's atmosphere.

Conclusion:
In conclusion, the formation of oxygen in the Earth's atmosphere is primarily attributed to the photosynthesis of plants. Through this intricate process, plants convert sunlight, carbon dioxide, and water into glucose and oxygen. The oxygen released during photosynthesis accumulates over time, leading to the oxygen-rich atmosphere we have today.

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