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NUTRITION IN ANIMALS – HETEROTROPHISM

NUTRITION IN ANIMALS – HETEROTROPHISM

Meaning and Types of Heterotrophism

  • This is a mode of nutrition whereby organisms feed on complex organic matter from other plants or animals
  • All animals are heterotrophs
  • Their mode of feeding is also said to be holozoic to distinguish it from other special types of heterotrophic nutrition namely:
  • Saprophytism
  • Parasitism
  • Saprophytism/saprotrophysim- occurs in most fungi and some forms of bacteria
  • Saprophytes feed on dead organic matter and cause its decomposition or decay
  • Parasitism is a mode of feeding whereby one organism called the parasite feeds on or lives in another organism called the host and harms it
See also  WATER RELATIONS IN PLANT AND ANIMAL CELLS

 

Modes of Feeding in Animals                               

  • Animals have developed various structures to capture and ingest food
  • The type of structures present depend on the method of feeding and the type of food
  • Carnivorous animals feed on whole animals or portions of their flesh
  • Herbiverous animals feed on plant material
  • Omnivorous animals feed on both plants and animal materials

 

Feeding in Mammals

  • The jaws and teeth of mammals are modified according to the type of food eaten
  • Mammals have different kinds of teeth
  • Each type of teeth has a particular role to play in the feeding process
  • This condition is described as heterodont
  • The teeth of reptiles and amphibians are all similar in shape and carry out the same function
  • They are said to be homodont
See also  CONSERVATION OF NATURAL RESOURCES

 

Also See

ENZYMES

POLYSACCHARIDES

PROCESS OF PHOTOSYNTHESIS

NUTRITION IN PLANTS

BIOLOGY PRACTICAL

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