Question

Define bacteria...... ​

Answer 1

Bacteria:-

Bacteria are a type of biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals. Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats.

Answer 2

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$\huge\green {Bacteria}$

• Bacteria are small unicellular organisms.

• They are found everywhere- in air ,in water , in hot springs , in the body of living organisms too.etc.

• Bacteria are classified into four types based on their shapes - Coccus(circular) , Bacillus (Rod shaped) , Spirullum (spiral shaped) and Vibrio(comma shaped).

• They move with the help of flagella which are hair-like structures.

• They need moist atmosphere and moderate temperature for growth.

• They reproduce by asexual reproduction called Binary Fission.

• They can make their own food , obtain food from outside , feed on dead or decaying matter or live in the body of hosts.

• Examples of bacteria are -

1. Lactobacillus
2. Rhizobium
3. Azotobactor
4. Acetobacter
5. Streptococcus
6. Salmonella Typhi etc.

• Some bacterial diseases are- Typhoid , Cholera ,Diphtheria , Tuberculosis etc.

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