NEET-UG Biology · Class 12
Carbon and phosphorus cycles — NEET & JEE Questions
Carbon and phosphorus cycles is a topic in Ecosystem, a Class 12 Biology chapter of the NEET-UG syllabus. TestBudy holds 12 published NEET-UG questions on Carbon and phosphorus cycles, each with the marking scheme of the real paper. The ideas it examines include Gaseous versus sedimentary nutrient cycles, Carbon reservoirs and how much is fixed, Why phosphorus has no gaseous phase.
- questions
- 12
- shown here
- 10
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Key formulas and concepts
The ideas Carbon and phosphorus cycles is examined on, as they are tagged in the syllabus tree.
- Gaseous versus sedimentary nutrient cycles
- Carbon reservoirs and how much is fixed
- Why phosphorus has no gaseous phase
Carbon and phosphorus cycles MCQs with solutions
10 of the 12 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.
Which process removes carbon dioxide from the atmosphere and incorporates it into organic matter?
- A. Cellular respiration
- B. Photosynthesis
- C. Decomposition
- D. Combustion
A major process that removes carbon dioxide from the atmosphere is
- A. photosynthesis
- B. cellular respiration
- C. combustion
- D. decomposition only
Unlike the carbon cycle, the phosphorus cycle has no major
- A. gaseous atmospheric phase
- B. sedimentary component
- C. biological uptake step
- D. decomposition step
Weathering of phosphate-containing rocks contributes phosphorus to ecosystems mainly by
- A. releasing phosphate into soil and water
- B. converting phosphorus directly into atmospheric nitrogen
- C. removing all phosphate from soil
- D. forming glucose
Why is the phosphorus cycle described as largely sedimentary rather than gaseous?
- A. Plants release phosphorus directly as a gas
- B. Phosphorus is stored mainly as carbon dioxide
- C. Most phosphorus circulates as nitrogen gas
- D. It has no major atmospheric reservoir
The amount of nutrients such as carbon, nitrogen, potassium and calcium present in the soil at any given time is referred to as :
- A. Standing state
- B. Standing crop
- C. Humus
- D. Detritus
Which one of the following will accelerate phosphorus cycle?
- A. Burning of fossil fuels
- B. Volcanic activity
- C. Weathering of rocks
- D. Rain fall and storms
The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as :
- A. Standing crop
- B. Climax
- C. Climax community
- D. Standing state
Deforestation can affect the carbon cycle because it commonly
- A. reduces photosynthetic carbon uptake and may release stored carbon
- B. increases all carbon fixation automatically
- C. eliminates respiration
- D. removes carbon dioxide from combustion
Excess phosphate entering a lake from fertiliser runoff can contribute to
- A. eutrophication
- B. ozone depletion directly
- C. formation of a new atmospheric phosphorus layer
- D. complete elimination of algal growth
Common mistakes in Carbon and phosphorus cycles
Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.
- Treating phosphorus as if it cycles mainly through the atmosphere.
- Assumes all nutrient cycles have similar reservoirs and pathways.
Practise this chapter
Reading a question and answering it under a clock are different things. A chapter-length test measures whether the topic went in.