Question

Euglena apna bhojan keshise prapt karta hai

Answer 1

Answer:

Nutrition in Euglena:

• Euglena exhibit holophytic and saprozoic mode of nutrition.  

• Like a true plant it assimilates carbon and builds carbohydrates from carbon dioxide and water.  
• The holophytic type of nutrition occurs in the presence of sunlight and the green pigment chlorophyll plays an important role in this process.
•  Nitrogen and certain other minerals which are present in the pond water are absorbed by their cell surface.
• Access of carbohydrates produced are stored as paramylum.
•  Euglena behaves like an autotrophs as long as it remains in the presence of sunlight and certain other essential inorganic compound.
• The complete autotrophic process of Euglena is dependent upon vitamin B12  which is synthesised by bacteria and certain other micro-organisms.

• At times when the pond water becomes polluted with dead and decaying organic matter they gives up the holophytic mode of nutrition and switches over to the saprozoic mode of nutrition.

• Dead and decaying organic matters dissolved in the pond water are first digested extracellularly and then they are absorbed through the general body surface.  

• Some reports claim that small organisms present in the pond water are forced to enter the reservoir of the Euglena by movement of their flagellum and thus they engulf those small organisms. This is called as the holozoic mode of nutrition.

• Such holozoic mode of nutrition in Euglena is still a matter of doubt. No exact evidence about this mode of nutrition is found in Euglena.

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