proposed by Whittaker, which include Monera, Protista, Fungi, Plantae and Animalia. Carl woese divided the living world into domains- Bacteria, Archaeae and Eukarya. The domain Eukarya include Plantae, Animalia and Fungi. A new Kingdom called Chromista was erected to include Diatoms, Cryptomonads and Oomycetes.
Bacteria are microscopic, prokaryotic organisms and possess peptidoglycan in their cell wall. Based on Gram Staining method they are classified into Gram positive and Gram negative type. They reproduce asexually by binary fission. Sexual reproduction occurs through conjugation, transformation and transduction.
Archaebacteria are prokaryotic and are adapted to thrive in extreme environments. Cyanobacteria are prokaryotic organisms and are also called Blue Green Algae. The members of this group are ensheathed by mucilage cover. They reproduce by vegetative and asexual methods.
Fungi are eukaryotic, heterotrophic, unicellular or multicellular organisms. The cell wall is made up of chitin. They reproduce asexually by producing sporangiospores, conidia, thallospores, chlamydospores etc., The sexual reproduction is isogamous, ansiogamous and oogamous. In addition, gametic copulation, gametic fusion, spermatisation are also found.
They are beneficial to mankind. Some are known to cause disease in plants and human beings. The symbiotic association between the roots of higher plants and fungal mycelium is called mycorrhizae. Lichen thallus includes both phycobiont and mycobiont.
It is an example for symbiotic association. Evaluation . Which one of the following statement about virus is correct? a.
Possess their own metabolic system b. They are facultative parasites c. They contain DNA or RNA d. Enzymes are present .
Identify the incorrect statement about the Gram positive bacteria a. Teichoic acid absent b. High percentage of peptidoglycan is found in cell wall c. Cell wall is single layered d.
Lipopolysaccharide is present in cell wall . Identify the Archaebacterium a. Acetobacter b. Erwinia c.
Treponema d. Methanobacterium . The correct statement regarding Blue green algae is a. lack of motile structures b.
presence of cellulose in cell wall c. absence of mucilage around the thallus d. presence of floridean starch . Identify the correctly matched pair a.
Actinomycete – a) Late blight b. Mycoplasma