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zvonat [6]
3 years ago
6

I need help with this problem

Biology
1 answer:
Len [333]3 years ago
6 0

Viruses could pass through bacterial filter which made belief that viruses are fluid.

<h3><u>Explanation</u>:</h3>

Contagium vivum fluidum is the term that was used by the scientists to describe the virus. The virus was first discovered by the scientist Beijernick who isolated the tobacco mosaic virus and as the tried to filter and separate the virus through the finest of the filters possible, he couldn't. So he said that virus are fluid in nature. Later Ivanovsky also gave the same postulate. He crystallized the virus too.

But only after the invention of electron microscope, the structure and composition of virus were completely known.

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In the cycling of minerals, the micro-organisms help in fixing atmospheric nutrients e.g., nitrogen fixation by some bacteria and release the nutrients to the environment by decomposition of organic matters.

Different groups of bacteria help in the cycling of nitrogen , carbon and phosphorus by chemical fixing or releasing in environment.

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