Tag: the living world

Quizzes (21) Questions (85)

Questions Related to the living world

Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

Select the correct statements among the following (i-iv) regarding the characteristics of certain organisms.
(i) Methanogens are archaebacteria which produce methane in marshy areas.
(ii) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen.
(iii) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
(iv) Mycoplasma lack a cell wall and can survive without oxygen

  1. (ii) and (iii)

  2. (i) and (ii)

  3. (ii) (iii) and (iii)

  4. (i) (ii) and (iv)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statements (i), (ii), and (iv) are correct. (iii) is incorrect because chemosynthetic autotrophic bacteria do not synthesize cellulose; they typically fix carbon using chemical energy.

Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

Choose the correct answers from the alternatives given.
Facultative anaerobes:

  1. are photosynthetic

  2. do not always need oxygen

  3. are killed in an oxygenated environment

  4. require a constant supply of oxygen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A facultative anaerobe is an organism that makes aerobic respiration if oxygen is absent.

So, the correct option is 'do not always need oxygen'.

Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

Choose the correct answers from the alternatives given.
Which of the following archaea would live at a deep-sea vent?

  1. Heterotrophic nutrition

  2. Prokaryotic organisation

  3. Presence of flagella

  4. Rigid cell wall
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Archaea have rigid cell walls which help in living at a deep-sea vent.

So, the correct option is 'Rigid cell wall'.

Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

Choose the correct answers from the alternatives given.
During bacterial conjugation there is

  1. a partial but mutual exchange of genetic material between the conjugants

  2. only a partial transfer of genetic material from one conjugant to the other

  3. a mutual and complete exchange of genetic material between two conjugants

  4. a complete transfer of genetic material from one conjugant to the other
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Bacterial conjugation is the transfer of genetic material between bacterial cells by direct cell-to-cell contact or by a bridge-like connection between two cells. So the correct option is 'a complete transfer of genetic material from one conjugant to the other'.
Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

Choose the correct answers from the alternatives given.
Which of the following archaea would live at a deep-sea vent?

  1. Thermoacidophile

  2. Halophile

  3. Methanogen

  4. Parasitic forms
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A thermoacidophile is an extremophilic microorganism that is both can grow under conditions of high temperature and low pH.

So, the correct option is 'Thermoacidophile'.

Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

How are Archea different from Bacteria

  1. can form Methane

  2. have different rRNA sequences

  3. do not have peptidoglycan in their cell walls

  4. all of these are correct
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Archea are considered to be primitive than the Eubacteria, having properties more similar to Eukaryotes as compared to Eubacteria. Some of the features that are different from Eubacteria are, they are found in extremes of temperature, most of them are chemoautotrophs or chemoheterotrophs, Methanogens are a type of chemoheterotrophs that produce methane as a metabolic byproduct, they have pseudomurein or peudopeptidoglyclans in their cell wall. 
So, the correct option is 'all of these are correct'