Tag: biogeochemical cycles - gaseous

Questions Related to biogeochemical cycles - gaseous

What does 'Aluminum' irritate?

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Brook trout's gills

  2. Shark's gills

  3. Zooplankton's gills

  4. Phytoplankton's gills

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Correct Option: A

In ocean, carbon is usually in form of:

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Bicarbonates ions

  2. Carbon dioxide

  3. Calcium

  4. Phosphorous

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Correct Option: A

Emission of $CO$ and $NO _{2}$ are responsible for higher concentration of $O _{3}$ in

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Stratosphere

  2. Troposphere

  3. Thermosphere

  4. Biosphere

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Correct Option: B

What is natural sources of CO?

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. solid waste disposal

  2. Volcanic eruption and forest fire

  3. Motor vehicles

  4. Fuel combustion

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Correct Option: B

One molecule of CFCs contain 15000 molecules of

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. $CO _{2}$

  2. $CO$

  3. HCFCs

  4. CH4

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Correct Option: A

Proportion of CO consumption consists of basic components:

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. The leaf boundary layer

  2. The stomata

  3. Radiation exchange

  4. All of Above

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Correct Option: D

Carbon dioxide constitutes about 0.03% of the atmosphere

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. By volume

  2. By weight

  3. By mass

  4. None of these

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Correct Option: A
Explanation:

The air in our atmosphere is composed of molecules of different gases. The most common gases nitrogen  (78%), oxygen (about 21%), argon (almost 1%) and carbon dioxide (0.03%). Other molecules are present in  the atmosphere as well, but in very small quantities. Composition of air is measured in percent by volume,  at sea level at 15C and 101325 Pa.

Phtotochemical phase does not includes ________________.

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Fixation of ${CO} _{2}$

  2. Release of ${O} _{2}$

  3. Photolysis of water

  4. Formation of ATP and NADPH

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Correct Option: A
Explanation:

Photochemical phase includes photolysis of water and production of assimilatory power (ATP and NADPH). It liberates O2  during photolysis of water. 

The photochemical phase do not include fixation of CO2.

Chemical reactions triggered by ___________ transforms the organic material into hydrocarbons.

zoology bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. solar energy

  2. hydroelectric

  3. elevated temperatures

  4. decomposition

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Correct Option: C

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?

zoology bio-geo chemical cycles in nature nitrogen cycle biogeochemical cycles - gaseous nutrient cycles

  1. Step (i) is carried out by Nitrosomonas or Nitrosococcus

  2. Step (ii) is carried out by Nitrobacter

  3. Both step (i) and (ii) can be called nitrification.

  4. Bacteria carrying out these steps are usually photoautotrophs.

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Correct Option: D
Explanation:
Phototrophic bacteria are a group of bacteria, whose energy for growth is derived from sunlight and their source of carbon comes from carbon dioxide or organic carbon.
So, the correct option is 'Bacteria carrying out these steps are usually photoautotrophs'.