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Mode of nutrition in protist is of different types

(1) Holophytic or Photosynthetic:

In this process, protist organism synthesis their food with the help of carbon dioxide and water by utilizing sun’s energy in the photosynthetic pigments like chlorophyll.

Examples are dinoflagellates, diatoms and euglenoids.

(2) Holozoic:

Some protist have holozoic mode of nutrition, which is similar to animals i. e. food is first ingested and then digested.

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Cytoplasmic organelles

1. Mesosomes -

  • Mesosome was discovered by F. James. The cell membrane of bacteria invaginates (extensions) in cytoplasm at different places and form mesosomes or chondrioid. These extensions are in the form of vesicles, tubules and lamellae.
  • These are functionally mitochondria like structures. Oxidative enzymes are found in mesosomes. On the basis of position and function mesosomes are of two types;
  1. Peripheral mesosome - They are situated near the cell

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