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
Geological Time Table Meaning of time Scale: Geological time scale may be a table showing the sequence of earth science periods within the history of earth. Geological Time Table It additionally shows the lengths of your time totally different earth science periods square measure assumed to own occupied it's measured in a lot of years. it's been made by learning rock strata, wherever these are exposed by excavations or mining or wherever rivers have cut deeply into the earth’s crust. Scientists have established that lower the rock layer the older it's and therefore the additional ancient square measure the fossils it contains. With a data of rates of abrasion and deposition, the intervals occupied by totally different periods will be calculable roughly by measure the relative thicknesses of the rock strata. By the technique of radiometric geological dating (i.e. by measure the rates of decay of radioactiv