The following points highlight the top four modes of nutrition in protozoa. The modes are: 1. Holozoic 2. Holophytic (Holos = Whole + Phyton = Plant Origin) or Autotrophic (Photosynthesis) 3. Saprophytic (Sapros = Rotten) or Saprozoic 4. Parasitic. Mode # 1. Holozoic: (holos = whole + zoon = animal). Most of the free-living protozoon's depend on engulfing the whole [...]
In this article we will discuss about the structure and reproduction in paramoecium, explained with the help of suitable diagrams. Structure of Paramoecium: 1. The body is like a crude slipper (Fig. 18.10), the anterior end blunt and the posterior end narrower. 2. The surface is covered with a tough and flexible pellicle and cilia arising from basal granules are [...]
In this article we will discuss about the sense organs in aurelia, explained with the help of a suitable diagram. i. Sense Organs: The sense organs include the olfactory pits, the ocelli and the tentaculocysts or rhopalia. ii. Olfactory Pits: Two, lined with sensory epithelium—one lie on the ex-umbrella and the other in the sense club. These are chemoreceptors and [...]