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Question
Choose the correct statement(s) regarding phosphorus
I. There is no respiratory release of phosphorus into the atmosphere.
II. There is almost no input of phosphorus from the atmosphere through rainfall.
III. Fossil fuels are a major reservoir of phosphorus.
IV. Decomposition of dead and decayed organic matter releases phosphorus.
Choose the correct statement(s) regarding phosphorus
I. There is no respiratory release of phosphorus into the atmosphere.
II. There is almost no input of phosphorus from the atmosphere through rainfall.
III. Fossil fuels are a major reservoir of phosphorus.
IV. Decomposition of dead and decayed organic matter releases phosphorus.
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Solution
The correct option is D I, II and IV only
Phosphorus is the major constituent of the cellular membranes, nucleic acids and cellular energy transfer systems. The earth’s crust is the reservoir of phosphorus. Hence statement III is incorrect.
Phosphorus released due to weathering of rocks gets dissolved in soil and is absorbed by the plants. When herbivorous organisms consume plants, this phosphorus is then transferred to them. Carnivores obtain phosphorus from the herbivores. Decomposition of dead plants and animals by phosphate-solubilising bacteria also leads to release of phosphorus into the soil. Phosphorus is thus cycled in nature. Hence statement IV is correct.
The amount of phosphorus present in the atmosphere is negligible. Hence the input of phosphorus from the atmosphere through rainfall is almost nil. Therefore, statement II is correct.
All living organisms undergo cellular respiration. During the process, carbon dioxide is produced as a byproduct and gets released into the atmosphere. There is no respiratory release of phosphorus to the atmosphere. Hence statement I is correct.
Phosphorus is the major constituent of the cellular membranes, nucleic acids and cellular energy transfer systems. The earth’s crust is the reservoir of phosphorus. Hence statement III is incorrect.
Phosphorus released due to weathering of rocks gets dissolved in soil and is absorbed by the plants. When herbivorous organisms consume plants, this phosphorus is then transferred to them. Carnivores obtain phosphorus from the herbivores. Decomposition of dead plants and animals by phosphate-solubilising bacteria also leads to release of phosphorus into the soil. Phosphorus is thus cycled in nature. Hence statement IV is correct.
The amount of phosphorus present in the atmosphere is negligible. Hence the input of phosphorus from the atmosphere through rainfall is almost nil. Therefore, statement II is correct.
All living organisms undergo cellular respiration. During the process, carbon dioxide is produced as a byproduct and gets released into the atmosphere. There is no respiratory release of phosphorus to the atmosphere. Hence statement I is correct.
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