Bacteria in Micro Organism
Bacteria in Micro Organism
Bacteria: They are among the smallest and oldest organisms on our planet and are found in four different shapes: rod-shaped (bacillus), spherical (coccus), curved (commas), and spiral (spirillum). Lactobacillus and Streptococcus are examples of bacteria. Some bacteria like saprophytic bacteria are useful which breakdown dead plants and animals. They are called decomposers. Some bacteria grow in the presence of oxygen and are called aerobic bacteria, those which grow in the absence of oxygen are called anaerobic bacteria.
Uses of Bacteria:
Commercial use or industrial use:
Harmful bacteria: They are generally parasites and cause large number of diseases in animals and plants. The disease caused in humans are tuberculosis, typhoid, tetanus, whooping cough, cholera and leprosy. Food spoiled by bacteria gives foul smell and bad taste.
Which of the following are correct : (a) Rhizobium bacteria change the nitrogen present in air into nitrate. (b) Escherichia coli bacteria are present in the intestines of humans. (c) A bacterium called Lactobacillus, present in the spoonful of curd added to the milk. | |||
| Right Option : D | |||
| View Explanation | |||
Cell division in asexual reproduction of bacteria is known as ________________. | |||
| Right Option : C | |||
| View Explanation | |||
The nucleus of a bacterium is ________________ | |||
| Right Option : B | |||
| View Explanation | |||
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