Biology, asked by swathi2899, 1 year ago

Nutrition in animal amoeba and hydra definition

Answers

Answered by khanahmed
2
Amoeba is a microphagous feeder, it feeds upon small aquatic organisms like bacteria , protozoans, particles of algae and other minute food particles.
It engulfs the food particles along with water drops with the help of psendopdia and form food vacuole, this is called Indestion. Now lysosomes attach with the membrane of food vacuole and secrete different types of enzymes like proteases, amylases and lipses to decompose proteins, starch and lipids respectively.
In this way the food is digested in the food vacuole, which is diffused out of food vacuole in to the cytoplasm,  which is distributed to every organelle of cell organism to be assimilated. This digestion is called Intracellular as it occurs in the cytoplasm of cell.Smaller food vacuole with undigested food reaches up to membrance through cyclosis, from where it is egested exocytosis 

Nutrition in Hydra (Extracellular Digestion in Hydra)

Hydra is aquatic, diploblastic  coelenterate animals, with vase-shaped digestive cavity. It is microphagous feeder and feeds upon small aquatic animals like crustaceans, small annelids and insect larvae.
The prey like Daphnia and cyclops is paralysed or killed by stinging cells called nematocysts having hair like trigger.
Tentacles then grasp the prey and push it in to mouth, so that prey comes in to hollow cavity called coelenteron this is called ingestion.
The glandular cells of inner body layer called gastroderm secrete enzymes which digest food partially in the cavity called Extra cellular Digestion. Now gastodermal flagellate cells and body contractions mix up the food with enzymes, so that food is broken into fine particles, which are engulfed through phagocytic action of inner layer cells, where intracellular digestion is completed in the digestive vacuoles.
Now this digested food is diffused to outer layer cells called epidermis. The undigested food is expelled out from mouth as Hydra has no anus.
This is called Sac-like Digestive System. So Hydra shows extracellular and intracellular digestion.
Similar questions