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

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
See also  MATERIALS NEEDED FOR COLLECTION OF ORGANISMS

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

Also See

ENZYMES

POLYSACCHARIDES

PROCESS OF PHOTOSYNTHESIS

NUTRITION IN PLANTS

BIOLOGY PRACTICAL

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