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 | |||
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In blue green algae, the structure specialised for nitrogen fixation is ____________________ | |||
Right Option : C | |||
View Explanation |
Bacteria which can resist cold are called | |||
Right Option : C | |||
View Explanation |
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Abhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
My experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
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Abhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
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Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.