BIOLOGY

                                   VEGETATIVE STRUCTURE AND ANATOMY OF NOSTOC OCCURRENCE OF NOSTOC * IT IS FILAMENTS FROM OF BOTH TERRESTRIAL AND  AQUATIC HABITAT. * IT DOES NOT OCCUR IN SIMPLE FILAMENT BUT GROW IN LARGE COLONY OF CLOSELY PACKED TRICHOME. * THE TRICOME ARE EMBEDDED IN MATRIX GILATINOUS BACTERIA. * THE THALI ARE UP OF VARIOUS SIZE AND SHAPE AND MAY BE SOLID OR HOLLOW. * IT SIZE THEY ARE MICROSCOPIC P-SIZE OR AS LARGE AS PLUMB. * THE COLOR MAY BE OLIVE GREEN OR BLUE GREEN. STRUCTURE OF THE COLONY * THE CHAINS OF THE TRICOME OF VARYING LENGTH OF TANGELED IN GILATINOUS MATRIX TO FORM A COLONY. * EACH TRICOME IS USUALLY ENCLOSED BY IT S OWN MUCILAGINOUS SEATH AN IS CALLED AS FILAMENT. * EACH COLONY APPEARS LIKEN BLUISH GREEN OR YELLOW MASS IN JELLY. * YOUNG COLONY ARE SMALL AND MICROSCOPIC BUT THE MATURE ON LARGE. STRUCTURE OF THE TRICHOME * TRICOME ARE MORE CROWDED ...

                                VEGITATIVE STRUCTURE 

                                                       WHAT IS EVOLUTION Evolution is a slow and continuous process by a similar life from are converted into complex form

* Cell division is a process by which new cell are originated from pre existing cell. * cell division is divide into two types.       (1) Mitosis       (2) Meosis

* It is an important group of thalophyta. * The word thalophyta is coming derive from 2 Greek word thalous means sprout and phylum means plant. * The term alge is coming from Latin word which means seaweds. The term alge introduced by linaus in 1753. * The plant body of alge differentiated into leaf stem and root. * The plant body is thalus like structure. * The plant body may be unicellular or multicellular. *Almost all the alge aquatic in nature. * They contains chlrophill pigment. * The sex organ is unicellular and non jacketed. * Water is not needed for fertilization. * No embryo formation takes place. * They autotrophic mode of neutration. *Eg- Nostoc, volvox,ectocatcus etc 

* viruces are submicroscopic organism. * They are less than 200mm. * They have no protoplasm. * They can pass through bacterial filter. * They are obligate particle. * They have no norvous system and respiratory system.

                                                                          CELL Cell is the structural and functional unit of living organisim Each cell is indipendent in performing all necessery process of life . The cell was discovered by robert hoek in1665 under light microscope. the term cell is derived from a latin word "cella" which means hollow cavity. Leuenhoek in 1674 observed free cells with an improve microscope.