Ch: 1 The Living world
Ch: 1 The Living world Ernst Mayr: The “Darwin of 20th century” Biological concepts of species Main characteristics of living:- Growth. (Not defining property) Reproduction (Not defining property) Metabolism (Defining property) Cellular organisation (Defining property) Consciousness (Defining property) 1.Growth (irreversible,permanent) Twin character (increase in mass+ increase in number) Multicellular/Unicellular => Cell division ( vitro-culture ) 1. Indeterminate (Unlimited) - Plants 2. Determinate (Limited) - Animals 3. Intrinsic - Living 4.Extrinsic- Non living For Eg: Accretion of mountain ; Boulders ; Sand-mounds Note: 1.Higher plants => [ Growth ; Reproduction ] Mutually exclusive 2.Unicellular organisms (amoeba;Bacteria) =>[ Growth;Reproduction] synonymous 2.Reproduction (2 Types : (i) Asexual (ii)Sexu