Auto = self, Trophic = nutrition. The literal meaning of this term is self-nutrition. Autotrophic nutrition is a process where the organism prepares its food from the simple inorganic materials like water, mineral salts and carbon dioxide in the presence of sunlight. All the green plants possess an autotrophic mode of nutrition.
The autotrophic organisms contain a green coloured pigment called chlorophyll which helps in trapping energy from the sun. They prepare their own food by utilizing solar energy, water, and carbon dioxide by the process of photosynthesis. This results in forming of glucose.
Plants like blue-green algae and cyanobacteria could be considered as the example of autotrophic nutrition.
Photosynthesis is a process to convert the solar energy into chemical energy to synthesize starch. Different parts of a plant play different roles to complete this process.
- Leaves – They are considered as the food factories of the plant.
- Stomata– It is present in the lower epidermis of the leaf which uses carbon dioxide from the air.
- Roots – They absorb minerals and water from the soil and transport it to different parts of the plant.
Leaves of the vascular plants have a special structure known as chloroplasts which possess chlorophyll. Plants synthesize glucose with the help of carbon dioxide and water in the presence of sunlight. The stomata present in the leaf releases oxygen and water as a by-product during the daytime. The synthesized food is transported to different parts of the plant for storage and utilization. These green plants prepare proteins using nitrogen which could be obtained from the soil.
All the minerals which are dissolved in water are used to convert sugar into proteins, fats, and carbohydrates. These food components act as the source of energy for other heterotrophic animals and plants. Glucose is synthesized by this process and converted into different compounds like cellulose and starch which is stored in different parts of the plant.
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