Tag: biology

Questions Related to biology

The atomic no. of carbon is ________

biology biogeochemical cycles carbon cycling mineral coal carbon cycle

  1. 5

  2. 6

  3. 12

  4. 14

Show answer
Correct Option: B
Explanation:

The atomic no. of carbon is 6, The atomic no. of Boron is 5, The atomic no. of Magnesium is 12, The atomic no. of Silicon is 14.

The carbon cycle is the movement of carbon on Earth by the processes of --- and ---- .

biology biogeochemical cycles carbon cycling mineral coal carbon cycle

  1. Plants and animals

  2. Respiration and photosynthesis

  3. Breathing in and breathing out

  4. Oxygen and carbon dioxide

Show answer
Correct Option: B
Explanation:
Carbon exists in the atmosphere as the compound carbon dioxide. It first enters the ecological food web when photosynthetic organisms, such as plants and certain algae, absorb carbon dioxide through tiny pores in their leaves. The plants then "fix" or capture the carbon dioxide and are able to convert it into simple sugars like glucose through the biochemical process known as photosynthesis. Plants store and use this sugar to grow and to reproduce. Thus, by their very nature as makers of their own food, plants remove carbon dioxide from the atmosphere. When plants are eaten by animals, their carbon is passed on to those animals. Since animals cannot make their own food, they must get their carbon either directly by eating plants or indirectly by eating animals that have eaten plants.
Respiration is the process in which oxygen is used to break down organic compounds into carbon dioxide  (CO2) and water (H2O). For an animal then, respiration is both taking in oxygen (and releasing carbon dioxide) and oxidizing its food (or burning it with oxygen) in order to release the energy the food contains. In both cases, carbon is returned to the atmosphere as carbon dioxide.
So, the correct answer is 'Respiration and photosynthesis'.

In the earths crust carbon is found in the form of

biology biogeochemical cycles carbon cycling mineral coal carbon cycle

  1. Carbonates

  2. Hydrogen carbonates

  3. Petroleum

  4. All of the above

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Correct Option: D
Explanation:

In the Earths crust only 0.02% Carbon is found in the form of minerals like carbonates, hydrogen carbonates, coal and petroleum.

Burning of fossil fuels affects

biology biogeochemical cycles carbon cycling mineral coal carbon cycle

  1. Nitrogen cycle

  2. Carbon cycle

  3. Phosphorus cycle

  4. Water cycle

Show answer
Correct Option: B
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'

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.

biology biogeochemical cycles carbon cycling mineral coal carbon cycle

  1. $2, 3$ and $4$

  2. $1, 3$ and $4$

  3. $1$ and $2$

  4. $1, 2, 3$ and $4$

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Correct Option: A

Carbon dioxide is a naturally-occurring component of the atmosphere.

biology biogeochemical cycles carbon cycling mineral coal carbon cycle

  1. True

  2. False

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Correct Option: A

The percentage of carbon in lignite is ______%.

biology ecology carbon cycling mineral coal carbon cycle

  1. $70\, to \,90$

  2. $60\, to\, 80$

  3. $60\, to\, 90$

  4. $60\, to \,70$

Show answer
Correct Option: D
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.

The variety of coal having highest carbon content is:

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

  1. peat

  2. anthracite

  3. bituminous

  4. lignite

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Correct Option: B
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.

Peat coal contains about _____ % carbon.

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

  1. 28

  2. 78

  3. 68

  4. 88

Show answer
Correct Option: A
Explanation:

There are four different types of coal

(i) Anthracite $\Rightarrow 90$% carbon
(ii) Bituminous $\Rightarrow 70$% carbon
(iii) Lignite $\Rightarrow 40$% carbon
(iv) Peat coal $\Rightarrow 28$% carbon
Peat coal has $28$% carbon.

Which of the primary state in transformation of coal?

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

  1. Peat

  2. Lignite

  3. Bitumen

  4. Anthracite

Show answer
Correct Option: A
Explanation:

Peat is the first stage in the formation of coal. The heat and pressure from the top layers convert dead plants into a spongy brown material called peat.