General characteristics and classification of phylum Protozoa
Term Protozoa (From Greek, protos meaning first, zoon meaning animals) was given by Goldfass. According to five-kingdom classification system, protozoans belong to the phylum Protozoa […]
Month: December 2017
Characteristic features of phylum Platyhelminthes
Body is dorso-ventrally flattened, leaf like (unsegmented) or tape like (segmented). They are commonly flat worms. They may be free-living like Planarians or parasitic like […]
General characteristics of phylum Aschelminthes (Nemathelminthes)
They are cylindrical, unsegmented and triploblastic animals commonly known as round worms. They are mostly aquatic, but few are terrestrial. They are free-living as well […]
Invention of Cat’s eyes, Ballpoint pen and Richter scale
Cat’s eyes: Cat’s eyes are the little reflectors set in the road which make driving at night easier. Possibly inspired by real cat’s eyes, British […]
General characteristics of phylum Coelenterata/Cnidaria
Coelenterates are the first metazoan also called cnidarians (stinging animals). They have one continuous space or gastrovascular cavity called coelenteron. Coelenterates are aquatic (may be […]
General characteristic features of phylum Porifera
Poriferans (Pore bearing animals) are the first multicellular animals. They are commonly called sponges because of their appearance. They are aquatic, mostly marine, rarely fresh […]
Differences between RNA and DNA
S.N. Ribonucleic acid (RNA) Deoxyribonucleic acid (DNA) 1. It contains ribose sugar. It contains deoxyribose sugar. 2. It lacks Thymine but has Uracil. It lacks […]
Clinical thermometer, antiseptics and the process of pasteurization
Clinical thermometer: Nineteenth- century doctors knew that a patient’s body temperature was a good guide to their health. Until British physician Thomas Allbutt invented the […]
Differences between Dicot and Monocot stem
S.N. Dicotyledonous stem Monocotyledonous stem 1. Internally, the stem is differentiated into epidermis, hypodermis, cortex, endodermis, pericycle, stelar system and pith. Internally, the stem is […]
Scope of biology
Biology: The science which deals with the study of structure, organization, life processes, interactions, origin and evolution of living organisms is called biology. Aristotle is […]