Food Manufacturing in Plants (Photosynthesis).

Nutrition

Nutrition is the process of acquiring energy and materials such as proteins, glucose, minerals, fats etc.

Living organisms can be grouped on the basis of their source of energy or source of carbon.

1. Autotrophic Use of inorganic sources of carbon i.e. CO₂, for example plant, algae and bacteria e.g. cyanobacteria.
2. Heterotrophic The source of carbon is organic for example animals and protoctista.

Photosynthesis

Photosynthesis is the process whereby green plants, algae makes their own food in which complex organic molecules, glucose is formed by the use of simple inorganic materials such as CO₂, H₂O and minerals in the presence of light absorbed by chlorophyll.

In green plants, photosynthesis can be summarised by the following equation.

Importance of photosynthesis

1. Production of Oxygen Photosynthesis releases oxygen into the atmosphere as a byproduct. This oxygen is essential for the respiration of most living organisms, including humans.
2. Basis of the Food Chain Plants are primary producers in ecosystems, meaning they produce their own food through photosynthesis, forming the base of the food chain. Herbivores consume plants, and carnivores eat herbivores, ultimately sustaining life on Earth.
3. Carbon Dioxide Absorption Photosynthesis helps to regulate the levels of carbon dioxide (CO₂) in the atmosphere. Plants absorb CO₂ during photosynthesis, reducing the impact of this greenhouse gas and helping to mitigate climate change.
4. Energy Source Photosynthesis converts solar energy into chemical energy stored in glucose. This energy is used by plants for growth and reproduction and is passed on to other organisms through consumption.
5. Maintains the Oxygen-Carbon Dioxide Balance The process helps to maintain a balance between oxygen and carbon dioxide in the atmosphere, which is crucial for sustaining life forms that depend on oxygen.
6. Supporting the Biosphere Photosynthesis plays a key role in sustaining the biosphere by providing energy and nutrients to a wide variety of organisms