Question

(i)Why virus are different from other microorganisms?

(ii)Name some friendly microorganisms?

(iii)How microorganism increase the fertility of the soil.

(iv)Describe Nitrogen cycle?


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Answer 1

Answer:

Answer:1. viruses can't survive without an host. they reproduce and multiply only inside the cell of other organisms. viruses are the agent of diseases. common cold, influenza, measles, polio, are some examples of viruses , while , other microorganism found everywhere , soil , air , water , etc.

2. Name of a friendly microorganisms is lactobacillus which help in the formation of curd from milk.

3.nitrogen gas of the atmosphere combines with oxygen and vapours during thunder and lightning to form nitric acid and reaches the soil reaches the soil . nitric acid is converted into nitrates in the soil. most nitrogen fixation, however, depends on certain bacteria like algae . date 1 nitrogen from the atmosphere and form nitrogen compounds. when nitrogen fixing organisms die there decay release nitrates into the soil. Hence,this is how microorganism increase the fertility of the soil.

4. once the nitrogen has been fixed it is absorbed by the roots of the plants . animals eat the plants .when the animal or plant die bacteria decompose the body and the nitrogen is released in the atmosphere.this continuous circulation of nitrogen among the soil water air and living organism is known as nitrogen cycle .

Explanation:

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Answer 2

Answer:

• Virus is an living and non living creature both in the living body it behaves as a living organism and carries out his body functioning through the nutrients of that living body and on the other hand when it is outside the body it lives in the form of crystals which is a non living substance .

Explanation:

• Rhizobium , Nostoc , Anabena

• Soil microorganisms are responsible for most of the nutrient release from organic matter. When microorganisms decompose organic matter, they use the carbon and nutrients in the organic matter for their own growth. They release excess nutrients into the soil where they can be taken up by plants.

• The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. The majority of Earth's atmosphere (78%) is atmosphere nitrogen, making it the largest source of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems.The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, including primary production and decomposition. Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle. Human modification of the global nitrogen cycle can negatively affect the natural environment system and also human health.