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1. Micro-organisms in Air and Water

(i) Group of Micro-organisms: Bacteria, Viruses, Some algae, Protozoa, Fungi

(ii) The Concept of Culturing

2. Identification of Micro-organisms in (i) Air (ii) Pond Water (iii) River (iv) The Concept of Culturing

3. Micro-organisms in Our Bodies and Food

4. Carriers of Micro-organisms: Examples, Location of the Micro-organism in Carriers and Types of Micro-organism


Micro Organisms in Air and Water

Introduction: Micro-organisms are very tiny living organisms are also known as microbes.

T-Lymphocyte Infected With HIV

Human immunodeficiency virus (HIV) is the cause of acquired immunodeficiency syndrome (AIDS). By infecting CD4 T-lymphocytes, a type of white blood cell, HIV weakens the immune system and leaves the infected individual open to deadly infections. The viruses gain access to a T-lymphocyte by attaching to CD4 proteins on the outer surface of the cell membrane.


Anthony Van Leeuwenhoek (1632 – 1733) was the first scientist to discover microbes with his newly invented microscope.

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