Batrachospermum Occurrence:- (1) Batrachospermum is fresh water alga. (2) It is found in clear, cool, and running streams. (3) Deepwater plants are dark violet or reddish in color. But the shallow-water species are olive green. (4) The intensity of light changes the color of pigments. (5) The thallus is attached to the substratum. Vegetative structure (1) The thallus of an adult plant is soft, thick, filamentous. (2) It is freely branched and gelatinous. (3) The central axis is made up of a single row of large cells. Whorls of branches of limited growth are developed on this axis. (4) These branches are filamentous and dichotomously arranged. (5) The main axis is corticated. It consists of a row of elongated cylindrical cells. (6) It is differentiated into nodes and internodes. (7) There are two types of branches that arise from the nodes: Branches of limited growth Branches of unlimited growth Batra
Corona Virus History and origin of Corona virus :- First human corona virus characterised in 1960 ,later in 2003;5 more human infected corona virus identified including the severe acute respiratory infection corona virus .NL63 is newly identified group of corona virus which include Nl and the haven corona virus . these viruses are associated with lower and upper respiratory tract and cause respiratory infections. Corona is a group of viruses that causes disease in Mammals and birds .Some basic examples of corona virus is Common cold virus(Rhinovirus) but some examples are very dangerous or may be lethal :SARS,COVID-19,MERS and etc.SARS-COV firstly identified in 2003 and SARS-COV 2 idetified in 2019 Newly discovered Corona virus . Structure of corona virus :- Corona virus is plriomorphic virus spherical with bulbulous projection mainly it consist a lipid bilayer Membrane M,spike S,envelope E,and structural pr