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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

Questions

QUESTIONS

(A) Fill in the blank:

Organisms that could not be seen by naked eyes are called as ______.

Ans: (Micro organisms)

Small objects/organisms can be seen with the help of ______.

Ans: (Microscope)

Micro organisms can be broadly divided into _____ major groups.

Ans: (five)

_____ is a group of microbes which is always unicellular and prokaryotic.

Ans: (Bacteria)

Habitat of microorganismas

HABITAT OF MICROORGANISMS

Microorganisms may be single-celled like bacteria, some algae and protozoa, or multicellular, such as algae and fungi.
They could be found in air, soil or water with varied conditions like ice cold climate to hot springs and deserts to marshy lands.
Microorganisms can easily adapt to different conditions.
They are present everywhere (ubiquitous).
Some microorganism like amoeba can live alone.
While fungi and bacteria may live in colonies.

Uses of microorganisms

USES OF MICROORGANISMS

Making of Curd and Bread:

Curd contains several microorganisms.
The bacterium, Lactobacillus promotes the formation of curd.
It multiplies in milk and converts it into curd.

Bacteria are also involved in the making of cheese, pickles and many other food items.