Category: Biology Second Paper

These virus look like eggs. For example, influenza virus

All these virus have a head and tail like a frog. Their head is 95×65 nm and tail is 110×25 nm. Like- T2,T4,T6,T8 etc.

All these virus are cubic in appearance. Their size is 100-350 nm. For example, vaccinia virus, herpes virus, wart virus, adenovirus etc. Dr. Siddiq Publications

These virus are very round. Their diameter is 10-250 nm. For example – Polio virus, Dengue virus, Flavi virus, Tomato bushystan virus, Corona virus, HIV, TGV, TIV etc.

Their shape is like a rod. This virus is 300 nm in length and 18 nm in width. For example, tobacco mosaic virus, mumps virus, alfalfa virus etc.

1. Rod virus: Their shape is like a rod. This virus is 300 nm in length and 18 nm in width. For example, tobacco mosaic virus, mumps virus, alfalfa virus etc.
2. Round virus: These virus are very round. Their diameter is 10-250 nm. For example – Polio virus, Dengue virus, Flavi virus, Tomato bushystan virus, Corona virus, HIV, TGV, TIV etc.
3. Cubical virus: All these virus are cubic in appearance. Their size is 100-350 nm. For example, vaccinia virus, herpes virus, wart virus, adenovirus etc. Dr. Siddiq Publications
4. Frog-shaped virus: All these virus have a head and tail like a frog. Their head is 95×65 nm and tail is 110×25 nm. Like- T2,T4,T6,T8 etc.
5. Egg-shaped virus: These virus look like eggs. For example, influenza virus.
6. Thread virus: They look like thin threads. For example – Dwarf virus of wheat, Streak virus of pea. Dr. Siddiq Publications
7. Cylindrical virus: They look like cylinders. For example, Ebola virus, pea streak virus etc.
8. Bullet-like virus: This virus looks like a bullet. For example, rhabdovirus.

Average diameter of virus is 8-300 nm. Typically plant virus are 17-2000 nm and animal virus 20-350 nm. The smallest plant virus is Satellite Tobacco Necrosis Virus, 8-17 nm. The largest plant virus is Citrus tristeza virus, which is 2000×12 nm. The smallest animal virus is the foot and mouth disease virus of cattle, which is 8-12 nm. The largest animal virus is the smallpox virus, which is 350×250×100 nm. Rhinovirus 10 nm, Polio virus 12 nm, Cauliflower mosaic virus 50 nm, Influenza virus 100 nm, Herpes virus 100-150 nm, Mumps virus 150-250 nm, Vaccinia and variola virus 280-300 nm, Bovine distemper virus 300 nm. over nm, tobacco mosaic virus 300×18 nm and potato X virus 500×10nm. Bit yellow virus 1250×40 nm.

Virus live in both living and inanimate environments. Plants, animals, bacteria, cyanobacteria, fungi, actinomycetes etc. are actively present in living organisms. Again, soil, water, air etc. remain passive everywhere. They are found in very cold water from high springs. 1 teaspoon of sea water contains 1 million virus.

The branch of biology that deals with the size, structure, propagation, pathogenesis, etc. of virus is called Virology. W. M. Stanley is called the father of virology. Dr. Siddiq Publications

According to biochemists, virus are inert substances. But according to microbiologists, virus are organisms. The properties of virus clearly prove that virus are neither living nor inanimate. For this reason, scientist A. Lowff commented in 1952 – A virus is a virus. It is neither a living organism nor a non-living chemical, but something in between. That is, a virus is a virus. It is neither living matter nor inert chemical matter. A virus is a type of organism between living and non-living things.
In 1962, scientists Stanley and Valens commented, virus are already like inanimate objects, but the moment they get a chance to attack a cell, the moment life is transmitted.