What is photosynthesis?

Photosynthesis is a process through which life, as we know it, can exist. Not only the plants benefit, but also the animals since we breathe oxygen, a gas that the leaves expel.

It is very interesting to know in-depth photosynthesis, as there are several phases, and there are even some plants that, due to the climatic conditions in which they live, have learned to do it in a slightly different way.

What is photosynthesis?

Photosynthesis is a process by which plants convert light energy from the sun , therefore, is carried out only during the day. Those in charge of fulfilling this important function are the chloroplasts, which are greenish structures found in the leaves.

Their color is due to chlorophyll, which is a biomolecule without which the plant kingdom could not photosynthesize. It is so important that plants with variegated leaves (that is, green and yellow for example) grow more slowly than plants with completely green leaves. In addition, they are more vulnerable to sunlight, suffering burns more quickly than those that are green.

What are the phases of photosynthesis in plants?

As we anticipated at the beginning, photosynthesis has two phases, which are:

Light phase

The light phase is the one that takes place during the day. We could say that it is photosynthesis itself; Not surprisingly, it is during the day when the sun remains high and, consequently, when plants can absorb its light energy. 

It consists of transforming that light into energy, mainly in the form of ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate), with the help of water and oxygen that the roots and leaves absorb respectively.

Dark phase

The dark phase is the final phase of photosynthesis, and consists of converting carbon dioxide and other substances into glucose , which constitutes food for plants.

To do this, they use both ATP and NADPH produced in the light phase, and they also perform two more processes: the fixation of carbon in carbohydrates, and the Calvin cycle. In this last process, organic matter is stored as glucose.

Do all plants photosynthesize in the same way?

Photosynthesis is carried out by chloroplasts

Not really . In fact, depending on how they fix carbon, three types of plants have been identified:

  • C3 plants : are those that fix carbon dioxide in the Calvin cycle. They are the commons.
  • C4 plants : what they do is transform carbon dioxide into malate, which will be taken to the cells producing CO2 and pyruvate. Only then will the Calvin cycle begin. 
  • CAM plants : these are plants that, due to the high daytime temperatures, keep their pores closed until the night. As a result, they cannot absorb carbon dioxide and, therefore, carry out photosynthesis. Thus, they absorb it during the night transforming into malate, which during the day allows them to produce CO2 and carry out the Calvin cycle. 

What is the function of photosynthesis?

Basically in transforming the sun’s energy into food for plants through a series of chemical reactions in which they use not only sunlight, but also carbon dioxide and water. As a consequence, they expel oxygen, a gas that we all depend on to breathe.

Now, it is important to clarify that the expulsion of O2 is not counted as a function, but as a result of photosynthesis. Animals, including humans, depend on the plant kingdom to exist. But, it may surprise you to know that, although terrestrial plants are very important for life, if we have to say which is the living being that produces the most oxygen, we might be surprised.

Phytoplankton, the producer of up to 85% of atmospheric oxygen

Phytoplankton produce more than half of the oxygen

Yes, phytoplankton, organisms that live in aquatic environments (seas, swamps, rivers), which, by absorbing the sun’s energy, carry out photosynthesis, expelling oxygen. Many of the beings that form it are cyanobacteria, green algae and diatoms.

Therefore, they and not the forests are the basis of life . But not only because of the oxygen, but also because the food chains begin with them. Any change that occurs in the water, such as heating, or acidification of it, will prevent them from performing their functions normally.

Phytoplankton produces more than half of the oxygen that is available on this planet , that is why it is very important to take care of the seas, but also the terrestrial environment, since we cannot forget that deforestation and pollution are two of the causes that the climate change is accelerating.

We hope that everything you have learned about photosynthesis has been useful to you.

What is photosynthesis?

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