Question

1. What are salient features of Monera?
2. What will be the shape of a bacillus and
coccus type of bacteria?
3. Write a note on useful and harmful
bacteria.​

Answer 1

Answer:

1. Monera are unicellular organisms.

2. They contain 70 ribosomes.

3. They reproduce sexually by binary fission .

4. The DNA is naked and is not bounded by a nuclear membrane.

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Answer 2

1. What are salient features of Monera?

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• 1. Found in almost all habitats on Earth.

• 2. Are unicellular prokaryotes.

• 3. Does not have a well-defined nucleus in their cells.

• 4. Shows asexual mode of reproduction.

• 5. Size of their micro-organisms is small.

• 6. Classified into archaebacteria, eubacteria, and cyanobacteria.

• Example: Bacteria, cyanobacteria, et,cetera.

2. What will be the shape of a bacillus and coccus type of bacteria?

• Cocci: These bacteria are oval in shape. These may be diplococci, streptococci, and staphylococci.

• Rod-shaped: Bacilli are rod-shaped bacteria. These can be single or arranged together in pairs or groups. For eg., diplobacilli and streptobacilli.

3. Write a note on useful and harmful bacteria.

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• Bacteria are used to make antibiotics like streptomycin and vitamin-B complex Tablets.

• Bacteria are used in production of vinegar ,curd, cheese, etc.

• Some useful bacteria live in the large intestine of human beings and produce vitamin-k,B-5 , biotin and B12 , e.coli.

• Some bacteria are able to fix nitrogen from the atmosphere to enrich soil with nitrogen and increase it's fertility. These microbes are commonly called biological nitrogen fixers.

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• Bacteria cause diseases in plants Eg.citrus canker,Potato scub.

• Diseases like Cholera, tuberculosis are caused due to bacteria in human beings and animals.