In this article we will discuss about the structure of different organs of Mammalia. 1. Skin (Vertical Section) Mammalia: (Fig. 41.1) The skin consists of two layers; an outer epidermis and a deeper dermis. A subcutaneous layer of loose connective tissue is present beneath the dermis. 1. Epidermis, a stratified, keratinized epithelium. It has two layers: A. Stratum corneum, the [...]
In this article we will discuss about the spot identification of different animals. I. Protozoa: Balantidium sp.: (Fig. 36.1) 1. Unicellular animal. 2. Short cilia cover whole body. 3. Cytopharynx present. 4. Micro- and macronucleus present. 5. Contractile vacuoles two with radiating canals. Systematic position: Subkingdom — Protozoa Phylum — Ciliophora Class — Kinetofragminophorea Subclass — Vestibuliferia Order — Trichostomatida [...]
In this article we will discuss about the collection of plankton. I. Biotic Community: An aquatic microscopic biotic community is constituted by: (a) Pelagic forms suspended in water, localised mostly towards the surface, and (b) Benthonic or bottom dwellers attached to the bottom or submerged in mud. Collection of Plankton: Pelagic forms: A. Hand net: 1. The plankton is collected [...]