1. Bacteria live as parasites in plants and animals. Lives as a mitotic organism in the intestines of animals. Bacteria living in human body are – Salmonella typhosa, Mycobacterium tuberculosis, Bacillus anthracis, Diplococcus pneumoniae, Clostridium tetani etc.
2. There are about 40 million bacteria in one gram of soil and about 1 million in one milliliter of fresh water. Bacteria living in soil are Rhizobium, Azotobacter, Bacillus, Clostridium, Nitrosococcus, Nitrosomonas etc.
3. There are 10 times more bacteria than there are cells in the human body. 500 species of bacteria live in the human mouth.
4. There are about five billion bacteria on Earth. The total biomass of bacteria is greater than that of all plants and animals.
5. Bacteria survive in extreme cold (-17°C) and extreme heat (100°C). Bacteria can live in the presence or absence of oxygen.
6. Human cholera (Vibrio cholerae), dysentery (Bacillus dysenteti), tuberculosis (Mycobacterium tuberculosis), typhoid (Salmonella typhosa), whooping cough (Bordetallapertussus), pneumonia (Diplococcus pneumoniae), diphtheria (Corynebacterium diptheriae), syphilis (Treponema pallidum), gonorrhea ( Neisseria gonorrhoeae), meningitis (Neisseria meningitidis), plague (Yersinia pestis), tetanus (Clostridium tetani), leprosy (Mycobacterium leprae) etc. are caused by bacteria.
7. Diseases like Mycobacterium bovis and undulated fever, sheep anthrax (Bacillus anthracis), goat brucellosis (Brucella sui), rat plague (Yersinia pestis), poultry cholera (Bacillus avisepticus) etc. are caused by bacteria.
8. Wheat blight (Agrobacterium tritici), rice blight (Xanthomonas oryzae), sugarcane blight (Xanthomonas vasculorum), tomato canker (Corynebacterium michiganese), tomato and rose crown gall (Agrobacterium tumefaciens), lemon canker (Xanthomonas citri), potato Scab disease (Steptomyces scabies), apple fire blight (Erwinia amylovora), oat root rot and potato soft rot (Erwinia carotovora), tobacco blight (Pseudomonas tabacci), cotton leaf spot (Xanthomonas mavacearum), bean leaf spot (Xanthomonas malvacearum) ) etc. diseases are caused by bacteria.