Calvin Cycle: Carbon Assimilation Pathway — NEET Biology
📚 Practice ConceptJust after world war II, when the world was under shock after the Hiroshima-Nagasaki bombings, and seeing the ill-effects of radio-activity, Calvin and co-workers put radio-activity to beneficial use. He along with J.A. Bassham studied reactions in green plants forming sugar and other substances from raw materials like carbon dioxide, water and minerals by labelling the carbon dioxide with C14. Calvin proposed that plants change light energy to chemical energy by transferring an electron in an organised array of pigment molecules and other substances. The mapping of the pathway of carbon assimilation in photosynthesis earned him Nobel Prize in 1961.
Consider the following statements : 1. The organismic level of organisation gave rise to sociology and related disciplines. 2. The cellular and molecular level of organisation led to physiology and biochemistry. 3. Melvin Calvin studied photosynthesis using radioactive carbon dioxide labelled with C¹⁴. 4. Calvin demonstrated that plants release oxygen from carbon dioxide during photosynthesis. 5. Mapping the pathway of oxygen assimilation in photosynthesis earned Calvin the Nobel Prize in 1961.
View solution & NCERT explanation
Correct answer: C — 2, 3 and 4 are correct
Statement 1 : NCERT clearly says the first perspective at organismic level resulted in ecology and related disciplines and not sociology. Statement 2 : The second perspective at cellular/molecular level gave rise to physiology and biochemistry. Statement 3 : Calvin and J.A. Bassham traced carbon assimilation by labelling CO₂ with C¹⁴. Statement 4: Oxygen released during photosynthesis comes from water, not CO₂. Statement 5 : Mapping the pathway of carbon assimilation (Calvin cycle) earned him the Nobel Prize in 1961 not oxygen assimilation.
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