Tag: botany

Questions Related to botany

Which of the following is incorrect about bryophytes?

botany kingdom plantae uses of bryophytes introduction to bryophytes cryptogams

  1. Sex organs are multicellular

  2. Water is essential for fertilisation

  3. Meiosis occurs at the time of spore formation

  4. Antherozoids are non-motile

Show answer
Correct Option: A

Organisms called methanogens are most abundant in a

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

  1. Hot spring

  2. Sulphur rock

  3. Cattle yard

  4. Polluted stream

Show answer
Correct Option: C
Explanation:

Methanogens are the primitive bacteria belonging to archaea which are able to produce methane through the process of methanogenesis. These organisms can utilise the carbon dioxide and hydrogen gas to form methane. These organisms are found in marshy areas where they produce the marsh gas, in swamps and in the stomach of cattle. The methane is released along with the other wastes by the cattle and so, methane is found abundantly in the cattle yard. 

Thus, the correct answer is option C. 

Archaebacteria and eubacteria have been included under the kingdom

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

  1. Monera

  2. Plantae

  3. Fungi

  4. Protista

  5. Animalia

Show answer
Correct Option: A
Explanation:

Monera is a kingdom that includes prokaryotic unicellular organisms. It includes bacteria, Eubacteria, Archaebacteria, Cyanobacteria. They lack membrane-bound organelles. They also lack true nucleus. Instead, they have nucleoid, genetic material without nuclear envelope.

Thus, the correct answer is 'Monera.'

Archarbacteria with purple coloured pigment in cell membrane :

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

  1. Can survive in extreme saline conditions.

  2. Are chemoautotrophs

  3. Can use light energy to synthesize ATP

  4. Both (A) and (C)

Show answer
Correct Option: D
Explanation:

Answer is option D i.e. "Both (A) and (C)"
Archarbacteria are salt loving bacteria that can live in strong salt solutions. Hence they are also called halophiles. In presence of strong sunlight they develop a purple colored pigmented membrane to utilize light energy producing ATP.

Archaebacteria that flourish in temperature above $100^0C $ have special ______ molecules that do not coagulate at high temperatures and remain functional. 

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

  1. carbohydrate

  2. ester

  3. protein

  4. fat

Show answer
Correct Option: C
Explanation:
Archaebacteria that flourish in temperature above 100 degree C have special protein molecules that do not coagulate at high temperatures and remain functional.
So, the correct answer is 'protein' 

Methanogens do not produce:

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

  1. oxygen

  2. methane

  3. hydrogen sulphide

  4. carbon dioxide.

Show answer
Correct Option: A
Explanation:
Methanogens produce methane, hydrogen sulphide and carbon dioxide by methanogenesis.
So, the correct option is 'oxygen'

Study the following statements and select the correct ones.
(i) Methanogens are archaebacteria which produce methane in marshy areas.
(ii) Nostoc is a filamentous blue green alga which fixes atmospheric nitrogen.
(iii) Many members of the genus Glomus form mycorrhiza.

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

  1. (i) and (ii)

  2. (i) and (iii)

  3. (ii) and (iii)

  4. (i), (ii) and (iii)

Show answer
Correct Option: D
Explanation:
Methanogens are archaebacteria which produce methane in marshy areas. Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen. Many members of the genus Glomus form endomycorrhiza.
So, the correct option is '(i), (ii) and (iii)'

Members of the archaebacteria

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

  1. May possess bacteriorhodopsin

  2. Possess branched chain lipids

  3. May possess high temperature tolerant enzymes

  4. May associated with body of eukaryotic organisms

Show answer
Correct Option: C
Explanation:

Enzymes synthesized by archaea (with optimal growth temperatures of >80 degree Celsius), also called hyperthermophilic enzymes, are typically thermostable ( that is resistant to irreversible inactivation at high temperatures) and are optically active at high temperatures. 

A few organisms are known to grow And multiply at a temperature of $100 - {105^ \circ }C$ they belong to

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

  1. Thermophilic sulphur bacteria

  2. hot spring blue green agae

  3. methanogenic archaebacteria

  4. Marine archaebacteria

Show answer
Correct Option: A
Explanation:

Thermophilic sulphur bacteria can survive at high temperatures between 41 and 122$^o$C and an optimum growth temperature which is higher than 75$^o$C. Hot spring blue-green algae have an optimum growth temperature of 45$^o$C. Methanogenic archaebacterium grows at an optimum temperature of 35-40$^o$C. Some marine archaebacteria are extreme thermophiles and grow at temperatures of 65- 80$^o$C. 

So, the correct answer is 'Thermophilic sulpher bacteria'.

Which of the following statement is not related to bacteria?

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

  1. They have polysomes for protein synthesis

  2. They have pill for genetic recombination

  3. They store food in the form of inclusion bodies

  4. They have plastid for antibiotic resistance

Show answer
Correct Option: A