Bacteria
0.2 to 100 micron.
Bacilli: Rod shape (Escherichiacolli)
Cocci: Spherical (Streptococcus pneumoniae)
Vibrio: Comma shape (Vibrio cholerae)
Spirilla: Spiral shape (treponema pallidum)
Virus
Poisonous liquid, acellular both non living and living very small 20 - 300 nm. HIV , dengue, influenza, cow pox,
Rinderpest, head and mouth disease , tobacco mosaic, yellow vein mosaic.
Algae
Sea weed sea weed, spyrogyra, volvox, chlamydomonas, Have chlorophyll blue green algae nitrogen fixiation. Chlorella. Gellidium, Gracillaria
Protozoa
First animal, amoeba , paracmecium, euglena autotroph Protista
Fungi
Yeast, mould, mushroom. Penicillium
Red rot: sugarcane
Wilt: chickpea
Tikka: groundnut
Smut: wheat