Tag: biogeochemical cycles - gaseous

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Questions Related to biogeochemical cycles - gaseous

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

Proportion of CO consumption consists of basic components:

  1. The leaf boundary layer

  2. The stomata

  3. Radiation exchange

  4. All of Above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The consumption of carbon dioxide by plants is influenced by various factors including the leaf boundary layer, stomatal conductance, and the energy balance (radiation exchange).

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

Carbon dioxide constitutes about 0.03% of the atmosphere

  1. By volume

  2. By weight

  3. By mass

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Phtotochemical phase does not includes ________________.

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

  3. Photolysis of water

  4. Formation of ATP and NADPH
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. solar energy

  2. hydroelectric

  3. elevated temperatures

  4. decomposition
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The formation of hydrocarbons from organic matter (kerogen) in sedimentary rocks occurs through a process called catagenesis, which is driven by elevated temperatures and pressures over geological time.

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

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?

  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.
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.