Nitrogen cycle - class-X
Description: nitrogen cycle | |
Number of Questions: 39 | |
Created by: Rani Rajan | |
Tags: botany environmental science ecology and environment energy flow in an ecosystem organisms and their environment bio-geo chemical cycles in nature biogeochemical cycles mineral nutrition environment biology ecosystem : structure and function zoology |
Reaction carried out by $N _2$ fixing microbes include
$2NH _3 + 3O _2 \rightarrow 2NO _2^- + 2H^+ + 2H _2O$ (i)
$2NO _2^- + O _2 \rightarrow 2NO _3^-$ (ii)
Which of the following statements about these equations is not true?
A farmer adds Azotobacter culture to soil before sowing maize. Which mineral element will be replenished by doing so?
Which of the following is a non-symbiotic nitrogen fixing prokaryote?
Which of the following is a free living aerobic nitrogen fixing bacterium present in the soil?
Mark the incorrect match.
Which one of the following bacteria is not connected with nitrogen fixation?
Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?
Nitrifying bacteria convert the________________
An organism used as a biotertilizer for raising soyabean crops is ______________.
Nitrifying bacteria _________________.
Nitrifying bacteria are able to
The common nitrogen-fixer in paddy field is _______________.
Which of the following can act as Nitrogen fixers?
The microorganisms that play an important role in maintaining the balance of nitrogen gas in the atmosphere are ________
The bacteria present in root nodules of leguminous plants that fix the atmospheric nitrogen is
Oxidation of nitrite into nitrate is done by
Oxidation of Ammonia into nitrite is performed by
(a) Nitrosomonas (b) Nitrosococcus (c) Nitrobacter (d) Nitrospira
Anaerobic bacteria are poisoned by which element ?
Nitrifying bacteria convert the
In excess, $C{O} _{2}$
Nitrosomonas and Nitrobacter convert
The common nitrogen fixer organism in paddy fields is
Nitrite is changed to nitrate by
Carefully read the following reactions carried out by nitrifying bacteria. Identify the statement about these equations which is not true.
2NH$ _3$+3O$ _2$ $\rightarrow$ 2NO$^- _2$ +2H$^+$ +2H$ _2O$ ---- (I)
2NO$^- _2$+O$ _2$ $\rightarrow$ 2NO$^- _3$ ---- (II)
Which one is not a free living nitrogen fixer?
Which of the following is free-living bacteria responsible for nitrogen fixation
In the process of nitrification, ammonia is first oxidized to nitrite by
Which of the following is a symbiotic nitrogen fixer ?
Phosphorus is required for better nitrogen fixation by Rhizobium
A nitrogen-fixing bacterium, which forms a loose association with the roots of crop plants (grasses) is
How many organisms In the list given below are $N _2$ fixer autotrophs?
Azotobacter, Chromobum, Azospirillum, Rhodospirillum, Rhizobium, Nitrobacter, Aulosira, Nostoc, Osallatona
Which of the following is a free living aerobic non - photosynthetic nitrogen-fixer ?
All of the following statements concerning the actinomycetous filamentous soil bacterium Frankia are correct except that Frankia
Bacteria involved in two-step conversion ammonia into nitrate are
Which of the following is a symbiotic nitrogen fixer?
Which gene cluster is responsible for nitrogen fixation in bacteria?
Match the columns and choose the correct option.
I | II | ||
---|---|---|---|
(a) | Free-living aerobic nitrogen fixers | 1. | Anabaena and Nostoc |
(b) | Anaerobic nitrogen fixers | 2. | Pseudomonas and Thiobacillus |
(c) | Nitrogen-fixing cyanobacteria | 3. | Nitrosomonas and Nitrosococcus |
(d) | Denitrifying bacteria | 4. | Azotobacter and Beijerinckia |
(e) | Nitrifying bacteria | 5. | Rhodospirillum |
Which one helps in absorption of phosphorus from soil by plants?
Which of the following is the function of nitrifying bacteria?