Sciencegajab

  THE LIVING WORLD  1. Systematic and detail description of life forms              o Identification, nomenclature and classification. 2. ERNST MAYR  ‘The Darwin of the20th century’; Pioneered the currently accepted definition of a biological species. 3. CHARACTERSTICS OF A LIVING ORGANISM               GROWTH:         TWIN CHARACTERISTICS                  •Increase in mass and increase in number         A multicellular organism grows by cell division.         In plants, the growtUnlimited & Localised           In animals, the growth is Limited & Unlocalised           Unicellular organisms grow by cell division.          Growth of living organism is from inside.           ...

  THE LIVING WORLD  1. Systematic and detail description of life forms              o Identification, nomenclature and classification. 2. ERNST MAYR  ‘The Darwin of the20th century’; Pioneered the currently accepted definition of a biological species. 3. CHARACTERSTICS OF A LIVING ORGANISM               GROWTH:         TWIN CHARACTERISTICS                  •Increase in mass and increase in number         A multicellular organism grows by cell division.         In plants, the growtUnlimited & Localised           In animals, the growth is Limited & Unlocalised           Unicellular organisms grow by cell division.          Growth of living organism is from inside.           ...

                        ANIMAL KINGDOM      1. Levels of Organisation All members of animalia are multicellular but all of them do not exhibit the same pattern of organisation of cells.              2. A complete digestive system has two openings, mouth and anus.            ●Platyhelminthes has only a single opening to the outside of the body that serves as both mouth and anus, and is hence called incomplete. 3. Circulatory system may be of two types: Open type in which the blood is pumped out of the heart and the cells and tissues are directly bathed in it and Closed type in which the blood is circulated through a series of vessels of varying diameters (arteries, veins and capillaries). 4. Symmetry   Sponges are mostly asymmetrical, i.e., any plane does not divide them into equal halves. When any plane passing through the central a...