Biology for SSC CGL Part 2: Bacteria, Protozoan, Fungus causing diseases.

BACTERIA 
'Bacteria is acellular organism that are always live in atmosphere.' These are of two types.
Aerobic:
Anaerobic:
Bacteria was discovered by "ANTONY VAN LEEUWENHOEK". He was also father of bacteriology. He also discovered compound microscope and first living cell - "Sperm Cell".

Biology for SSC CGL Part 1: Introduction, Virus causing diseases.

BIOLOGY
'Study of life. Father of Biology was "ARISTOTLE".
1. Botany: Study of plants. Book: Historia Plantarum. Father: "Theophrastus - थियोफ्रास्टस"
2. Zoology: Study of Animal. Book: Historia Animalium. Father: "Aristotle"

Pathogens-  'Disease causing agents'
These are VIRUS (lethal घातक -  form ) ,  BACTERIA,  FUNGUS,  PROTOZOA,