Biology, asked by msyee, 1 year ago

What are the different types of nutrition that occur in animals?Define them.

Answers

Answered by Anonymous
1
Heya !!!!

Good evening ..

Here is your answer
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There are 2 modes of Nutrition:

1. Autotrophic mode of nutrition

2. Heterotrophic mode of nutrition


1. Autotrophic mode of nutrition: This mode of nutrition is performed by autotrophs, e.g. green plants and some bacteria. On the basis of the source of energy utilised for preparation of food, autotrophs, can be of two types:

a) Photosynthetic autotrophs: Green plants fulfill their carbon and energy requirements by the process of photosynthesis using sunlight as a source of energy. Such organisms are called photoautotrophs.

b) Chemosynthetic autotrophs: Bacteria utilises chemical energy instead of light energy to synthesise their organic material ( food) . Such organisms are called chemoautotrophs.



2. Heterotrophic mode of nutrition :
In heterotrophic mode of nutrition, organisms cannot prepare food on their own. They obtain energy from organic molecules already produced by the autotrophs. The heterotrophic mode of nutrition differ depending on the type, availability and process of obtaining food materials by the organism.

Accordingly , there are herbivores, carnivores, omnivores, saprotrophs and parasites, included in heterotrophs.

Heterotrophic mode of nutrition can be of following three main types:

i) Holozoic nutrition : Herbivores, carnivores and omnivores possess the holozoic mode of nutrition. Complex food molecules are taken in and then broken down into simpler and soluble molecules in this type of nutrition,e.g. Amoeba , cow, goat, dog, cat, human being etc.


ii) Saprotrophic nutrition: Saprotrophs are the organisms having saprotrophic mode of nutrition. They usually feed open dead organic matter, breaking down complex materials outside the body and absorving it, e.g. fungi like bread moulds, mushrooms, yeast and bacteria.


iii) Parasitic nutrition: Parasites are the organisms having parasitic nutrition. These organisms live either on or inside the body
of the other organism ( host ) to obtain their nutrition without killing them, e.g. Plasmodium , ticks, lice, leech , flatworm, plants like cuscuta.

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