Essay On Autotrophic Nutrition

In this stage, the two energy sources provide the energy required to convert 3-phosphoglyceric acid into glyceraldehyde-3-phosphate (G3P) which is a three-carbon sugar.Lastly, in the third stage known as regeneration, some molecules of glyceraldehyde-3-phosphate are used to produce sugar molecules (glucose) while others are recycled in order to regenerate Ru BP for more reactions.

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Autotrophs are any organisms that are capable of producing their own food.

For most, this is achieved by using light energy, water and carbon dioxide.

This pigment captures/absorbs the red and blue wavelengths of light (visible spectrums) that produces the energy required for photosynthesis.

Here, two photosystems known as Photosystem I and Photosystem II (PSI and PSII) have a variety of pigments including chlorophyll molecule that absorb light energy.

- Chlorophyll a is the most common chlorophyll and can be found in the majority of the photoautotrophs including cyanobacteria, higher plants and algae.

Chlorophyll (a) captures blue-violet and orange-red light (at 675nm) while reflecting green light (thus appearing green in color).This stage is fueled by ATP which acts as the source of energy.For photoautotrophs, chlorophyll is a very important pigment.Rather than using energy from the sun, some will use chemical energy to make their own food.All autotrophs use non-living material (inorganic sources) to make their own food.Here, light energy obtained from the sun is used to produce food material (organic material) from carbon-dioxide and water.As mentioned, all photoautotrophs have chlorophyll. While some like cyanobacteria may not have a chloroplast that contains the chlorophyll, they have chlorophyll in place to capture light energy to be used for photosynthesis.The primary purpose of this phase is to convert light energy from the sun into chemical energy (ATP and NADPH).Using this chemical energy, plants are then able to synthesis organic material such as sugars.This provides energy required to move electrons from water molecules through the photosystems to make NADPH (Nicotinamide adenine dinucleotide phosphate) and ATP (Adenosine triphosphate).The first phase of photosynthesis is refered to as light dependent because it only takes place in the presence of sunlight.


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