Tag: bacteria

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Questions Related to bacteria

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

Cell division is a type of reproduction in 

  1. Unicellular organisms

  2. Multicellular organisms

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. thylakoids

  2. mesosomes

  3. pili

  4. spirilla
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.
Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

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

  1. Animals

  2. Plants

  3. Bacteria

  4. Fungi
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Rhizopus : Chlamydomonas

  2. Candida : Saccharomyces

  3. Pteridium : Fasciola

  4. Albugo : Adiantum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Amoeba and Paramecium are both unicellular protists. Similarly, Rhizopus (a fungus) and Chlamydomonas (an alga) are both eukaryotic microorganisms, though the relationship is broader than the original pair.

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

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

  1. Microscopic organisms

  2. Heterotrophic organisms

  3. Unicellular organisms

  4. Uninucleate organisms
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Amoeba and yeast undergo asexual reproduction via fission and budding, respectively, because they are single-celled (unicellular) organisms. Multicellular organisms typically have more complex reproductive strategies.

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

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

  1. Banyan and black buck

  2. Bentinckia nicobarica and red panda

  3. Tamarind and rhesus monkey

  4. Cinchona and leopard
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bentinckia nicobarica is an endangered palm endemic to the Nicobar Islands, and the red panda is an endangered mammal found in the Himalayas, making this pair represent endangered organisms in India. Other options mix widespread or different conservation status species.

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

Superbugs are

  1. Synthetic bug

  2. Bacteria

  3. Radio nucleotide

  4. Industries
Reveal answer Fill a bubble to check yourself
B Correct answer
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'

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

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

So, the correct option is 'True'.

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

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

  1. Anabaena

  2. Tolypothrix

  3. Chlorella

  4. Rhizobium
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Antibiotic are mostly obtained from

  1. Bacteria

  2. Viruses

  3. Fungi

  4. Angiosperms
Reveal answer Fill a bubble to check yourself
A Correct answer
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.