Main Steps of Nutrition:

1. Ingestion: The first step of nutrition is the intake of food through the mouth. The food is then physically broken down into smaller pieces by chewing.

2. Digestion: The process of digestion begins in the mouth where food is mixed with saliva that contains enzymes. The food then moves down to the stomach where it is mixed with digestive juices and broken down further. Nutrients are then absorbed in the small intestine and waste is eliminated through the large intestine.

3. Absorption: The nutrients that are broken down during digestion are absorbed into the bloodstream and transported to different parts of the body. These nutrients are used for growth, repair, and energy.

4. Assimilation: Once the nutrients are absorbed and transported to different parts of the body, they are assimilated into the cells. The nutrients are used to create new cells, repair damaged tissues, and provide energy.

Autotrophic Nutrition:

Autotrophic Nutrition is a process where organisms create their own food using sunlight, water, and carbon dioxide. This process is also known as photosynthesis. Plants, algae, and some bacteria are examples of autotrophs. They use chlorophyll to convert light energy into chemical energy that is used to create glucose. This glucose is then used by the organism for energy and growth.

Heterotrophic Nutrition:

Heterotrophic Nutrition is a process where organisms obtain food from other sources. This includes animals, fungi, and some bacteria. Heterotrophs cannot create their own food and must rely on other sources for nutrients. They obtain food by ingesting other organisms, absorbing nutrients from the environment, or through symbiotic relationships. This process includes ingestion, digestion, absorption, and assimilation.

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