Very Useful Notes on ‘Digestion in Invertebrates’
1. Digestion in Protozoa: In all protozoans except parasitic protozoans such as Trypanosoma, Monocystis, digestion takes place in the food vacuoles. Image Source: internal.champaignschools.org ADVERTISEMENTS: Digestion is carried out with the help of certain digestive enzymes. It is still not clear just how the digestive enzymes enter the food vacuoles (Barrington, 1962).According to De Duve 1963, the enzymes are hydrolytic in nature and are contained in special packages called lysosomes.It is believed that during the process of digestion the lysosomes arc discharged in some manner into the food vacuoles and thus contained food is broken down into its constituents whom then pass into the cytoplasm and be assimilated.The parasitic protozoans either absorb the predigested food of their host or digest their food with the help of hydrolytic enzymes outside the…