Tag: energy flow in an ecosystem

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Multiple choice botany energy flow in an ecosystem biogeochemical cycle nutrient cycles species, communities and ecosystems

The conversion of $\displaystyle $ is known as

  1. Denitrification

  2. Nitrification

  3. Nitrogen fixation

  4. Ammonification
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The process of conversion of free nitrogen from the atmosphere into soluble nitrates by microorganisms is  known as biological nitrogen fixation. 
When plants and animals die, the nitrogenous compounds present in their bodies are broken down into  ammonia. This process is known as ammonification.  Ammonia is converted to nitrates by nitrifying bacteria, such as Nitrosomonas and Nitrobacter, through a  process called nitrification.
Nitrification is followed by denitrification, wherein nitrates are converted into nitrogen gas (N2), by the  action of denitrifying bacteria such as species of Nitrosomonas, Pseudomonas, Alcaligenes and Bacillus.  The nitrogen gas is then released into the atmosphere.
Multiple choice botany energy flow in an ecosystem biogeochemical cycle nutrient cycles species, communities and ecosystems

Biogeochemical cycles

  1. Include the processes only conducted by or within living organisms

  2. Pertain only to the abiotic environment

  3. Describe the movement of water and other materials throughout the abiotic and biotic environment

  4. Are used to describe the attempts of humans to recycle various pollutants
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Breaking apart the word biogeochemical into pieces. The first part of the word, bio, involves biological organisms, like bacteria, plants, and animals. The next part of the word, geo, involves geological processes, like the weathering of rocks. The last part of the word indicates chemical processes, such as the formation of molecules. Thus a biogeochemical cycle or substance turnover or cycling of substances is a pathway by which a chemical substance moves through both biotic (biosphere) and abiotic (lithosphere, atmosphere, and hydrosphere) compartments of Earth. A cycle is a series of change which comes back to the starting point and which can be repeated.
So, the correct answer is 'Describe the movement of water and other materials throughout the abiotic and biotic environment'.
Multiple choice botany energy flow in an ecosystem biogeochemical cycle nutrient cycles species, communities and ecosystems

Biogeochemical cycle involves .......... factors.

  1. Biological

  2. Geological

  3. Chemical

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

Biogeochemical cycle involves biological, geological and chemical factors. The circulation of chemical nutrients like carbon, oxygen, nitrogen, phosphorus, calcium, and water, etc. between biotic and abiotic components of the biosphere is known as a biogeochemical cycle.

So, the correct option is option D.

Multiple choice botany energy flow in an ecosystem biogeochemical cycle nutrient cycles species, communities and ecosystems

________ is required to maintain the balance in nature.

  1. Biotic factors

  2. Abiotic factors

  3. Biogeochemical cycle

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The path through which a nutrient travels as it moves from the air, water or soil into the bodies of living organisms and back to the air, water or soil is called a biogeochemical cycle. It is one of the requirements to maintain the balance in nature.

Multiple choice botany energy flow in an ecosystem biogeochemical cycle nutrient cycles species, communities and ecosystems

Biogeochemical cycles are of

  1. Two types

  2. Three types

  3. Four types

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

The term biogeochemical cycle is used for exchange or circulation of biogenetic nutrients between living and nonliving components of a biosphere. 

The Biogeochemical or nutrient cycle can be- 
(A) gaseous cycle in which the materials involved in circulation between living and nonliving components are gases or vapours. E.g., carbon, hydrogen, oxygen. 
(B) sedimentary cycles of matter in which the materials involved in circulation between biotic and abiotic components of a biosphere are non-gaseous. E.g., phosphorous, calcium, magnesium.
(C) Hydrological cycle is the cycle where the surface water which gets evaporated due to the heat is returned back to the earth by precipitation through sequential interconvertible reactions.
So, the correct answer is option B.

Multiple choice botany energy flow in an ecosystem biogeochemical cycle nutrient cycles species, communities and ecosystems

If wild animals are killed, what difficulty would we face?

  1. Imbalance in nature

  2. Decrease in fog rain

  3. Decrease in population

  4. Increase in rain
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Killing wild animals disrupts food chains and food webs, causing ecological imbalance. Predators control prey populations, and their removal can lead to overpopulation of certain species and collapse of ecosystem dynamics.

Multiple choice botany energy flow in an ecosystem biogeochemical cycle nutrient cycles species, communities and ecosystems

Which one of the following pairs is a sedimentary type of biogeochemical cycle __________.

  1. Phosphorus and carbon dioxide

  2. Oxygen and nitrogen

  3. phosphorus and nitrogen

  4. phosphorus and sulphur
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In sedimentary cycles of matter, materials involved in circulation between biotic and abiotic components of biosphere are non gaseous and the reservoir pool is lithosphere e.g., phosphorus, calcium, magnesium.
Sulphur has both sedimentary and gaseous phases.

So, the correct answer is 'phosphorus and sulphur'

Multiple choice botany energy flow in an ecosystem biogeochemical cycle nutrient cycles species, communities and ecosystems

Which of the following cycle would be affected if decomposers of an ecosystem vanish ______________.

  1. Producer's cycle

  2. Consumer's cycle

  3. Decomposer's cycle

  4. Biogeochemical cycle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Recycling of material is carried out by decomposers. If decomposers of an ecosystem vanish recycling of materials is stopped, thereby affecting the movement materials between the biotic and the abiotic systems that forms the biogeochemical cycle.

So, the correct answer is 'Biogeochemical cycle'