Tag: botany

Questions Related to botany

________ is required to maintain the balance in nature.

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

  1. Biotic factors

  2. Abiotic factors

  3. Biogeochemical cycle

  4. None of the above

Show answer
Correct Option: C
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.

Biogeochemical cycles are of

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

  1. Two types

  2. Three types

  3. Four types

  4. Five types

Show answer
Correct Option: B
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.

Oxygen forms about ............. of the air in the atmosphere.

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

  1. 20%

  2. 30%

  3. 40%

  4. 45%

Show answer
Correct Option: A

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

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

  1. Imbalance in nature

  2. Decrease in fog rain

  3. Decrease in population

  4. Increase in rain

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Correct Option: A

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

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

  1. Phosphorus and carbon dioxide

  2. Oxygen and nitrogen

  3. phosphorus and nitrogen

  4. phosphorus and sulphur

Show answer
Correct Option: D
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'

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

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

  1. Producer's cycle

  2. Consumer's cycle

  3. Decomposer's cycle

  4. Biogeochemical cycle

Show answer
Correct Option: D
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'

Biogeochemical cycles are of _____________.

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

  1. Two types

  2. Three types

  3. Four types

  4. Five types

Show answer
Correct Option: A
Explanation:
The biogeochemical cycles are classified into 2 types namely gaseous cycles like Nitrogen, Carbon dioxide and sedimentary cycles like Phosphorus and Sulphur. 
So, the correct answer is 'Two types'

Sedimentary cycle having a small gaseous component is found in

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

  1. Phosphorus

  2. Nitrogen

  3. Carbon

  4. Sulphur

Show answer
Correct Option: D
Explanation:

Sedimentary cycle consists of weathering of an existing rock followed by the erosion of minerals, transport and deposition. It has earth's crust as the reservoir pool. Sedimentary cycle having a small gaseous component is found in sulphur. Other sedimentary cycles include iron cycle, calcium cycle.

Thus, the correct answer is 'Sulphur.'

Which of the following occurs in abiotic component of an ecosystem?

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

  1. Flow of energy

  2. Cycling of materials

  3. Consumers

  4. Flow of energy and cycling of materials

Show answer
Correct Option: B
Explanation:

An ecosystem is made up of biotic and abiotic components. Biotic components include plants, animals, microorganism. Abiotic components include nonliving things such as water, air, temperature, materials of the soil. Essential material includes minerals like carbon, nitrogen, phosphorous. Cycling of materials include release of minerals back to the environment. 

Thus, the correct answer is 'Cycling of materials.'

Which ones are reservoirs of phosphorus and nitrogen cycles respectively?

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

  1. Consumers

  2. Atmosphere and bedrock

  3. Atmosphere and producers

  4. Bedrock and atmosphere

Show answer
Correct Option: D
Explanation:

There are various of abiotic reservoirs in which the nutrients are recycled, released and stored in atmosphere. Atmosphere is the reservoir of carbon and nitrogen. Hence, these cycles are also called atmospheric cycles. Water is the reservoir of hydrogen and oxygen. Hence, these cycles are called as hydrological cycles. Bedrock is the reservoir of phosphorous. Hence, it is also called as sedimentary cycle.

Thus, the correct answer is 'Bedrock and atmosphere.'