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The mode of nutrition in amoeba is known as holozoic nutrition. It involves the ingestion, digestion and egestion of food material. Amoeba does not have any specialized organ for nutrition. Its entire process is carried through the body surface with the help of pseudopodia. -Mansher

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The mode of nutrition in amoeba is known as holozoic nutrition. It involves the ingestion, digestion and egestion of food material.
Amoeba does not have any specialized organ for nutrition. Its entire process is carried through the body surface with the help of pseudopodia. - Vidisha

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All animals and non-photosynthetic plants are classified as heterotrophs since they are unable to prepare food. So these organisms resort to other various forms of nutrition. Hence, from an ecological perspective, heterotrophs are always secondary or tertiary consumers in a food chain.

In nature, organisms exhibit various types of heterotrophic nutrition. They are as follows:

Holozoic Nutrition

Saprophytic Nutrition

Parasitic Nutrition

Holozoic Nutrition

Holozoic nutrition involves the ingestion and internal processing of solid and liquid food in an organism. This involves the steps of ingestion, digestion, absorption, assimilation and excretion.

Ingestion is the intake of food, which is broken down into simpler organic matters by a process called digestion. After extraction of useful components, the unwanted and undigested particles are excreted out.

Examples of animals that exhibit holozoic nutrition include all vertebrates. Even some unicellular organisms such as amoeba also exhibit holozoic nutrition

Arnav Sinha
Class 10A

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Heterotrophic nutrition is a mode of nutrition in which organisms depend upon other organisms for food to survive. They can't make their own food like Green plants. Heterotrophic organisms have to take in all the organic substances they need to survive.

Common examples of heterotrophs include animals, fungi and bacteria.

Types of Heterotrophic Nutrition

Organisms have various kinds of heterotrophic nutrition which can be classified into the following:

Holozoic Nutrition- This is a kind of heterotrophic nutrition where organisms intake solid food; a method that is also called ingestive nutrition. The food consumed may be either another organism or a plant. There are three different types of holozoic organisms and are classified on the basis of the food they consume. They are- carnivores, herbivores and omnivores.

Saprophytic Nutrition- This is a kind of heterotrophic nutrition where organisms obtain their food sources from remains of decaying organic substances, including dead organisms, decomposed leaves and plant remains, excreta, food articles and more.

Parasitic Nutrition- This is the third kind of heterotrophic nutrition where an organism derives its food from another living organism. The organism that derives its food and shelter from the other organism is known as a parasite, while the organism that lends food and shelter is known as a host.

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Heterotrophic nutrition is a mode of nutrition in which organisms depend upon other organisms for food to survive . Organisms  undergoing heterotrophic nutrition survive on consuming food (nutrients) produced by  what we  call autotrophs . There are some categories in which types  heterotrophic nutrition  have been classified -
1) saprophytic -  eg . mushroom ,fungi
2) parasitic - eg .  amarbel ( cuscuta ), leech
3)symbiotic - eg .  lichens
4) holozoic  - eg . humans , amoeba , paramecium

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Heterotrophic nutrition is a mode of nutrition in which organisms depend upon other organisms for food to survive. They can't make their own food like Green plants. Heterotrophic organisms have to take in all the organic substances they need to survive.
The various types of heterotrophic nutrition are-

1. Holozoic nutrition- It involves the ingestion and internal processing of solid and liquid food in an organism. This involves the steps of ingestion, digestion, absorption, assimilation and excretion. eg- Amoeba

2. Saprophytic Nutrition- Saprophytes feed on dead and decayed organisms for energy. They are an important part of the ecosystem as they help to keep our environment clean and recycle nutrient back into the ecosystem. eg- Mushrooms

3. Parasitic Nutrition- Organisms that live in or on other organisms and acquire food at the expense of its host are called parasites. Most parasites are harmful to the hosts’ health; sometimes, they even kill the host. Both animals and plants may serve as a host. eg- Cuscuta

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The organisms which feed on dead and decaying matter are called saprophytes. This mode of nutrition is known as saprotrophic nutrition. Saprophytes are a type of heterotrophs consisting of plants, fungi and microorganisms.

Examples- Mushrooms and moulds, Indian pipe, Corallorhiza orchids, Mycorrhizal fungi etc.

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Heterotrophic nutrition is known to be the mode of nutrition in which certain organisms are dependent on other organisms in order to survive. Organisms that cannot prepare their own food and have to depend on other organisms are known as heterotrophs.

Common examples of heterotrophs include animals, fungi and bacteria.
Atif

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All animals and non-photosynthetic plants are classified as heterotrophs since they are unable to prepare food. So these organisms resort to other various forms of nutrition. Hence, from an ecological perspective, heterotrophs are always secondary or tertiary consumers in a food chain.

Humans and other vertebrates rely on converting organic, solid or liquid food into energy. Other organisms such as fungi rely on converting dead organic matter into nutrients. In essence, heterotrophs break down complex food into its readily usable constituents.

Types of Heterotrophic Nutrition

In nature, organisms exhibit various types of heterotrophic nutrition. They are as follows:

Holozoic Nutrition

Saprophytic Nutrition

Parasitic Nutrition

Holozoic Nutrition

Holozoic nutrition involves the ingestion and internal processing of solid and liquid food in an organism. This involves the steps of ingestion, digestion, absorption, assimilation and excretion.

Ingestion is the intake of food, which is broken down into simpler organic matters by a process called digestion. After extraction of useful components, the unwanted and undigested particles are excreted out.

Examples of animals that exhibit holozoic nutrition include all vertebrates. Even some unicellular organisms such as amoeba also exhibit holozoic nutrition

Holozoic Nutrition in Amoeba

Amoeba exhibits holozoic nutrition. The process takes place in the following steps:

The amoeba projects its pseudopodia and encircles the food. It then engulfs the food by the process of phagocytosis.

The food vacuoles of amoeba are rich in digestive enzymes, which help break the food into simpler substances. This process is known as digestion.

The digested food is absorbed into the cytoplasm leaving behind the undigested materials. This absorbed food is utilised to produce energy for the growth and development of the cell.

The undigested food material is ejected out by the rupturing of the cell membrane.

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Holozoic nutrition is a type of heterotrophic nutrition that is characterized by the ingestion and internal processing of liquids or solid food particles. The lysosome is involved in digestion and destruction. An example of holozoic nutrition is amoeba.
- Arjan

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Saprophytism is a mode of nutrition in which organisms obtain food from dead organisms. Fungi secrete digestive juices on the substratum, on which they grow and obtain their food through extracellular digestion.

- Rou Yeeeun

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The mode of nutrition in which organism cannot make its own food from simple inorganic material and depend on other organism for its food. The mode of nutrition in which organism obtain its food from decaying organic matter of dead plants, animals, rotten bread

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The mode of nutrition in amoeba is known as holozoic nutrition. It involves the ingestion, digestion and egestion of food material.
Amoeba does not have any specialized organ for nutrition. Its entire process is carried through the body surface with the help of pseudopodia. - Maitri

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HETEROTROPHIC NUTRITION & ITS TYPES [akanksha]

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HETEROTROPHIC NUTRITION & ITS TYPES [akanksha]

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Heterotrophic nutrition is a mode of nutrition in which organisms depend upon other organisms for food to survive.
Types: 1. saprotrophic nutrition- eg mushrooms
2. holozoic nutrition- eg amoeba
3. parasitic nutrition- eg cuscuta
4. symbiotic nutrition- eg lichen

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shlok

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Shlok

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Paramecium is a unicellular organism which takes in its food at a specific spot. Food is moved to this spot by the movement of cilia which cover the entire surface of paramecium. Paramecia feed on microorganisms like bacteria, algae, and yeasts. To gather food, the Paramecium makes movements with cilia to sweep prey organisms, along with some water into the cell. As food enters the cell, it is gathered into food vacuoles, which are periodically closed off and released into the cytoplasm, where they begin circulating the body.

Shlok

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Holozoic nutrition is the process of nutrition that takes place in organisms which take solid or liquid food inside their body. For example- humans, amoeba, animals, etc.
There are five steps of holozoic nutrition-
Ingestion- Taking in of food by mouth.
Digestion- Breaking the foods down into simpler compounds.
Absorption- Absorbing of nutrients and water of food by the body before they are excreted.
Assimilation- Absorbing of nutrients by each of cells.

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https://youtu.be/5_4Y0tTHqyk

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A heterotroph is an organism that eats other plants or animals for energy and nutrients. The term stems from the Greek words hetero for “other” and trophe for “nourishment.” Organisms are characterized into two broad categories based upon how they obtain their energy and nutrients: autotrophs and heterotrophs.

Example: Fungi,Bacteria

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heterotrophic nutrition (Parasitic mode of nutrition)

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heterotrophic nutrition (Parasitic mode of nutrition)

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The organism which lives inside or outside of other organism  (Host) and Derives Nutritions from it is known as Parasitic mode of nutrition.
Eg:Tick

By Vedant Arora!