Tag: bacteria

Questions Related to bacteria

Cell division is a type of reproduction in 

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. Unicellular organisms

  2. Multicellular organisms

  3. Both A and B

  4. None of the above

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Correct Option: A
Explanation:

Cell division is the process in which a parent cell divides into two or more daughter cells. The unicellular organism divides and results in the formation of daughter cells and hence, cell division is a type of reproduction in unicellular organisms. Thus, the correct answer is option A.

Choose the correct answers from the alternatives given.
Surface appendages used by -bacteria to attach to one another and to host organisms are called:

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. thylakoids

  2. mesosomes

  3. pili

  4. spirilla

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Correct Option: C
Explanation:
A pilus is a thin, rigid fiber made of protein that protrudes from the cell surface. The primary function of pili is to attach a bacterial cell to specific surfaces or to other cells. So, the correct option is 'pili'.

Which of the following organisms do not depend on reproduction to exchange genetic information?

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. Animals

  2. Plants

  3. Bacteria

  4. Fungi

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Correct Option: C
Explanation:

Bacteria have three mechanism for genetic information transfer without undergoing reproduction-
1. Transformation- take up free fragment of DNA floating in medium. 
2. Transduction- transfer of DNA by a virus bacteriophage.
3. Conjugation- direct cell to cell transfer of DNA mediated by plasmid. So, option C is correct, all other options depend on reproduction for exchange of genetic material.

Select the pair that shows the same relationship as the animals in the box.
Amoeba : Paramecium.

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. Rhizopus : Chlamydomonas

  2. Candida : Saccharomyces

  3. Pteridium : Fasciola

  4. Albugo : Adiantum

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Correct Option: A

Amoeba and Yeast reproduce asexually by fission and budding respectively, because they are.

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. Microscopic organisms

  2. Heterotrophic organisms

  3. Unicellular organisms

  4. Uninucleate organisms

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Correct Option: A

Which of the following pairs of an animal and a plant represents endangered organisms in India?

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. Banyan and black buck

  2. Bentinckia nicobarica and red panda

  3. Tamarind and rhesus monkey

  4. Cinchona and leopard

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Correct Option: A

Superbugs are

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. Synthetic bug

  2. Bacteria

  3. Radio nucleotide

  4. Industries

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Correct Option: B
Explanation:

Superbugs is a term used to describe strains of bacteria that are resistant to the majority of antibiotics commonly used today. These resistant bacteria can cause pneumonia, urinary tract infections, skin infections and many other diseases that are difficult to treat and may be fatal.

So, the correct answer is 'Bacteria'

State whether the following statements are true or false.
All denitrifying bacteria are heterotrophs.

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

  1. True

  2. False

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Correct Option: A
Explanation:

Denitrifying bacteria convert nitrates in the soil to free atmospheric nitrogen, nitrogen-fixing bacteria are heterotrophs.

So, the correct option is 'True'.

A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with water fern Azolla is

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  1. Anabaena

  2. Tolypothrix

  3. Chlorella

  4. Rhizobium

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Correct Option: A
Explanation:

Anabaena belongs to the family of filamentous cyanobacteria that is known for its nitrogen fixing ability. While these exists as a plankton, it is known to form symbiotic relationships with the water fern Azolla and are found growing together at the surface of streams and ponds on temperate and tropical regions.
Therefore, the correct answer is option A.

Antibiotic are mostly obtained from

botany bacteria bacteria - friend and foe useful and harmful bacteria bacteria; benefits and harmful effects

  1. Bacteria

  2. Viruses

  3. Fungi

  4. Angiosperms

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Correct Option: A
Explanation:

The antibiotics are substances produced by the natural metabolic processes of spore forming aerobic bacteria and fungi as their natural defense against other microorganisms. Among bacteria and fungi, bacterial genera outnumber the fungal genera in production of antibiotics. The highest numbers of antibiotics are derived from bacterial genera Streptomyces and Bacillus and fungal genera Penicillium and Cephalosporium. This makes option A correct. Viruses do not perform any metabolic activity outside the host and hence, do not produce any antimicrobial agents. Angiosperms are most developed flowering plants that have number of adaptation to make them less susceptible for competition for food and space; they do not produce antibiotics. Thus, the correct answer is option is A.