Question is ⇒ __________ play a key role in the transformation of rock to soil., Options are ⇒ (A) Cyanobacteia, (B) Pectin decomposing bacteria, (C) Nitrifying bacteria, (D) De-nitrifying bacteria, (E) , Leave your comments or Download question paper.

Question is ⇒ __________ play a key role in the transformation of rock to soil., Options are ⇒ (A) Cyanobacteia, (B) Pectin decomposing bacteria, (C) Nitrifying bacteria, (D) De-nitrifying bacteria, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	__________ play a key role in the transformation of rock to soil.
A.	Cyanobacteia [Correct Answer]
B.	Pectin decomposing bacteria [Wrong Answer]
C.	Nitrifying bacteria [Wrong Answer]
D.	De-nitrifying bacteria [Wrong Answer]
View Answer 3 -4 Explanation:- Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ The phenomenon of commensalism refers to a relationship between organisms in which
one species of a pair benefits
both the species of a pair benefit
one species of a pair is more benefited
none of the above

⇒ Some microorganisms have the ability to increase the nitrogen content of soils, are called as
nitrogen fixation
denitrification
nitrification
all of these

⇒ Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?
Achromobacter
Agrobacterium
Alcaligenes
None of these

⇒ Denitrification may be distinguished as
dissimilative
assimilative
both (a) and (b)
blue baby syndrome

⇒ Which of the following is correct?
Mycorrhizae are fungi that form a mutually beneficial (symbiotic) relationship with plant roots
The fungi aid in transmitting nutrients and water to the plant roots
The increased nutrient availability from mycorrhizae is thought to be due to the additional absorbing surface provided by the fungi
All of the above

⇒ The nonsymbiotic bacteria which fix nitrogen live in the soil independently are
Azotobacter
Clostridium
considerably less important in comparison to the symbiotic bacteria
all of the above

⇒ The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?
Hydrolytic
Transitional
methanogenic
All of these

⇒ The microbial ecosystem of soil includes
biotic components of soil
abiotic components of soil
biotic and abiotic components of soil
none of the above

⇒ Nitrogen fixation by the microorganisms can be detected by adopting the approach of
demonstrating growth in a nitrogen free medium
cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
measuring¹⁵N₂ by mass spectrometer
all of the above

⇒ __________ play a key role in the transformation of rock to soil.
Cyanobacteia
Pectin decomposing bacteria
Nitrifying bacteria
De-nitrifying bacteria

⇒ Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as
ingestion of bacteria
ingestion of mold
ingestion of fungi
all of these

⇒ The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as
nitrification
denitrification
nitrogen fixation
ammonification

⇒ Assimilative denitrification is done by
plants
fungi
prokaryotes
all of these

⇒ An example of a symbiotic nitrogen fixer is
Azotobacter
Beijerinckia
Clostridium
Rhizobium

⇒ The groups of symbiotic bacteria, which have the ability to fix nitrogen
derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen
grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria
these bacteria are from the genus, Rhizobium
all of the above

⇒ The diagnostic enzyme for denitrification is
nitrate reductase
nitrate oxidase
nitro oxidoreductase
none of these

⇒ The crops which are involved in nitrogen fixation are
alfalfa and clover
soybean
bean and lupine
all of these

⇒ In the process of nitrogen fixation, which of the following microorganism is involved?
Non symbiotic microorganisms only
Symbiotic microorganisms only
Non symbiotic and symbiotic microorganisms only
None of the above

⇒ Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?
Saccharomyces cerevisiae
VA Mycorrhiza
Candida torulopsis
Aspergillus niger

⇒ Bacteria, as a group, are responsible for
nitrogen oxidation
sulfur oxidation
nitrogen fixation
all of these

⇒ The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are
Nocardia
Streptomyces
Micromonospora
all of these

⇒ The diagnostic enzyme for nitrogen-fixing organisms is
nitrogenase
nitrate reductase
nitrate oxidase
none of these

⇒ The groups of bacteria which have the ability to fix nitrogen from air to soil are
symbiotic
nonsymbiotic
both (a) and (b)
none of these

⇒ The conversion of molecular nitrogen into ammonia is known as
nitrification
denitrification
nitrogen fixation
ammonification

⇒ Which of the following is not the biofertilisers producing bacteria?
Nostoc
Anabaena
Both (a) and (b)
Clostridium

⇒ Which are the main source of biofertilisers?
Cyanobacteria
Bacillus
Streptococcus
None of these

⇒ The energy value of biogas is typically
400-700 BTU/ft³
1,000 BTU/ft³
1500 BTU/ft³
more than 5000 BTU/ft³

⇒ Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to
slow growth
medium growth
fast growth
none of these

⇒ Denitrification is carried out
usually by facultative anaerobes
predominantly by Pseudomonas spp
predominantly by Bacillus spp
all of the above

⇒ The nitrogenase consists of
dinitrogenase
dinitrogenase reductase
both (a) and (b)
none of these