Question

Define nutrients, nutrition and types of nutrition also define holozoic nutrition and different types of holozoic nutrition.

Answer 1

Explanation:

Holozoic nutrition (Greek: holo-whole ; zoikos-of animals) is a type of heterotrophic nutrition that is characterized by the internalization (ingestion) and internal processing of gaseous, liquids or solid food particles. ... Ingestion: In animals, this is merely taking food in through the mouth.

Answer 2

Answer:

★ Nutrients : Nutrients are chemical components of food which provide energy and materials needed by the body for maintaining a good health.

★ Major Nutrients : Carbohydrates, Vitamins, Proteins, Fats, Minerals.

★ Types of Nutrients : There are two types of nutrients -

• Macronutrients
• Micronutrients

★ Macronutrients : Macronutrients provide energy to a living being for the function of the metabolic system. They include fats, carbohydrates and proteins.

★ Micronutrients : Micronutrients provides essential components for metabolism to be carried out . They include vitamins, minerals, calcium, iron.

★ Functions of Nutrients :

• They are main source of energy for the body.
• They help in building and repairing body tissues.
• Helps in the synthesis of collagen.
• Increases the absorption of fat-soluble vitamins.
• They also help in maintaining the homeostasis of the body.

★ Nutrition : Nutrition is the science that interprets the intake of nutrient and other substances in food in order to maintain growth, health, reproduction, and disease of an organism. In easy words, process of intake of food and it's utilization by the body.

★ Types of Nutrition :

• Autotrophic
• Heterotrophic

★ Autotrophic Nutrition : In this mode of nutrition, organisms use simple inorganic matter like water and carbon dioxide in the presence of light and chlorophyll to synthesize food on their own.

During photosynthesis, carbon dioxide and water get converted into carbohydrates. These carbohydrates are stored in the form of starch in plants. Plants later derive the energy required from the stored starch .

Sites of Photosynthesis -

• Absorption
• Conversion
• Reduction

★ Heterotrophic Nutrition: In this mode of nutrition, organisms are not capable of preparing their food by themselves. They depend on others for their food. Such organisms are called heterotrophs. This mode of nutrition (of heterotrophs) is called heterotrophic nutrition.

Heterotrophs are classified into different categories based on their mode of nutrition :

• Parasites
• Saprophytes
• Holozoic

★ Holozoic Nutrition : Holozoic nutrition is the process of nutrition that takes place in organisms which take solid or liquid food inside their body.

Steps involved in holozoic nutrition -

• Ingestion
• Digestion
• Absorption
• Assimilation
• Egestion

⇝Ingestion - In this process the food is taken inside the body through mouth and broken down by teeth and initial digestion takes place in the mouth by saliva.

⇝Digestion - The process in which food is digested by using few enzymes and are used by the cells for producing energy.

⇝Absorption - The process in which cells use the energy from the digested food and helps in building tissues in our body .

⇝Assimilation - The process in which digested food moves into the cells of the body.

⇝Egestion - The process in which undigested food is removed out from the body through excretion.

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