Bacteria
Bacteria
In five kingdom classification bacteria is the sole member of kingdom Monera.
Characteristics of Bacteria :
For eg: Mycoplasma, Escherichia coli and blue - green algae or cynobacteria (Anabaena and Nostoc).
Cyanobacteria or blue green algae are the members of bacteria. They are called as the blue green algae because they also contain chlorophyll like plants and also perform photosynthesis. These bacteria perform the function of nitrogen fixation.
Bacteria can be beneficial or harmful for different living organisms.
Beneficial bacteria includes bacteria present in the our stomach which helps in digestion of food. Eg : Escherichia coli, Curd making bacteria, lactobacillus .
Harmful bacteria: Bacteria causes diseases like food poising (Clostridium botulinum), pneumonia (streptococcus bacterium) ,typhoid (Salmonella bacterium), tooth decay etc.
Rod-shaped bacteria are called bacilli (singular: bacillus), e.g., Bacillus anthracis, which causes the disease anthrax.
Spherical bacteria are called cocci (singular: coccus), e.g., Streptococcus pneumoniae, which causes the disease pneumonia.
Other types are spiral bacteria called spirilla and comma-shaped called vibrio.
Bacteria can be also be classified on the basis of Gram staining. If the bacteria take the gram stain or we can say get stained deeply then it is called as the gram positive bacteria and on the other hand if the bacteria does not take the stain then it is called as gram negative bacteria. This staining method was given by Christian Gram.
To kill the disease causing bacteria we use the antibiotics. Antibiotics are the medicine used by to kill the disease causing bacteria. The first antibiotic discovered by the Alexander Fleming was Penicillin.
Which of the following exihibit the charateristics given below ? X - Form a green scum over wet soil Y - Closer to bacteria Z- Pigments mask the chlorophyll | |||
| Right Option : C | |||
| View Explanation | |||
_________________ is prokaryotic cell amongst the following. | |||
| Right Option : B | |||
| View Explanation | |||
Bacteria lack _________________ | |||
| Right Option : A | |||
| View Explanation | |||
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My experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
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