Tag: carbon cycle

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Questions Related to carbon cycle

Multiple choice biology biogeochemical cycles carbon cycling mineral coal carbon cycle

Burning of fossil fuels affects

  1. Nitrogen cycle

  2. Carbon cycle

  3. Phosphorus cycle

  4. Water cycle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Carbon dioxide is being added to the atmosphere through two types of processes,
(A) Biological i.e respiration and decomposition release carbon dioxide.
(B) Non biological i.e burning of biomass and fossil fuel release a lot of carbon dioxide. Thus burning of fossil fuels affect carbon cycle of nature
So, the correct answer is 'Carbon cycle'
Multiple choice biology biogeochemical cycles carbon cycling mineral coal carbon cycle

Which of the owing statements regarding the maintenance of carbon cycle in the biosphere are correct?
a. Plant utilize solar energy to convert $CO _2$ and water into cellular materials and produce oxygen that animals consume.
b. Oxygen produced by the plants during carbon assimilation is not a byproduct.
c. Energy used by an animal comes from the oxidation of plant material releasing $CO _2$ that escapes into the atmosphere.
d. All decaying organic matter on the earth is ultimately degraded by molds and bacteria to yield $CO _2$ that escapes into the atmosphere.
Select the correct answer.

  1. $2, 3$ and $4$
  2. $1, 3$ and $4$
  3. $1$ and $2$
  4. $1, 2, 3$ and $4$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plants utilize solar energy for photosynthesis, converting carbon dioxide and water into cellular material while releasing oxygen, which animals consume. Animals derive energy by oxidizing plant material, releasing carbon dioxide back into the atmosphere, and all decaying organic matter is ultimately degraded by microbes to yield carbon dioxide. Statement 2 is incorrect because oxygen produced is indeed a byproduct of carbon assimilation, making statements 1, 3, and 4 correct.

Multiple choice biology ecology carbon cycling mineral coal carbon cycle

The percentage of carbon in lignite is ______%.

  1. $70\, to \,90$
  2. $60\, to\, 80$
  3. $60\, to\, 90$
  4. $60\, to \,70$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lignite is brownish-black in color and has a carbon content around   60–70  percent, a high inherent moisture content sometimes as high as $75$ percent, and an ash content ranging from $6–19$ percent.

Multiple choice biology coal, petroleum and petrochemicals carbon cycling mineral coal carbon cycle

The variety of coal having highest carbon content is:

  1. peat

  2. anthracite

  3. bituminous

  4. lignite
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Anthracite is a hard compact variety of coal that has a high lustre. it has the highest carbon content, fewest impurities and the highest calorific content of all types of coal which also include bituminous coal and lignite.

Multiple choice biology coal, petroleum and petrochemicals carbon cycling mineral coal carbon cycle coal and its products

The purest form of coal is:

  1. peat

  2. anthracite

  3. lignite

  4. bituminous coal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

High grade (HG) and ultra high grade (UHG) anthracite are the highest grades of anthracite coal. 

They are the purest forms of coal, having the highest degree of coalification, the highest carbon count and energy content and the fewest impurities (moisture, ash and volatiles).

Anthracite contains nearly 95% of carbon and is the purest form of coal so anthracite is the purest form of coal than any other forms.

Therefore, option B is correct.