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Microorganisms-Friends and Foe Notes

Microorganisms-Friends and Foe Notes

Topics :

- Types of micro-organisms

- Examples of different shaped bacteria

- Habitat of microorganismas

- Uses of microorganisms

- Beneficial microorganisms

- Nitrogen fixation

- Nitrogen cycle

- Harmful microorganisms

- Food preservation

Nitrogen fixation

NITROGEN FIXATION

Atmospheric nitrogen cannot be taken directly so they have to be fixed in the soil before it is being used by the plants.
Nitrogen fixation can be carried out in two ways

(1) By microorganisms, (2) By lightening

Rhizobium residing in the root nodules of leguminous plants and certain blue green algae helps in fixing atmospheric nitrogen.

Root nodules of leguminous plants

Nitrogen cycle

NITROGEN CYCLE

Questions

QUESTIONS

(A) Fill in the blank:

Microorganisms are found everywhere so they are _____.

Ans: (ubiquitous)

Milk gets converted into curd by the action of bacteria _____.

Ans: (Lactobacillus)

_____ is used in distilleries to produce alcohol.

Ans: (Yeast)

Fermentation means conversion of _____ into _____ by the action of _____.

Ans: (Sugar, alcohol, yeast)