निम्नलिखित कथनों में से कौन-सा “कार्बन निषेचन” (कार्बन फर्टिलाइज़ेशन) को सर्वोत्तम वर्णित करता है ?
Read this question in English
Which of the following statements best describes "carbon fertilization"?
(a) Increased plant growth due to increased concentration of carbon dioxide in the atmosphere · (b) Increased temperature of Earth due to increased concentration of carbon dioxide in the atmosphere · (c) Increased acidity of oceans as a result of increased concentration of carbon dioxide in the atmosphere · (d) Adaptation of all living beings on Earth to the climate change brought about by the increased concentration of carbon dioxide in the atmosphere
उत्तर और व्याख्या · explanation in English
Answer: (a) वायुमण्डल में कार्बन डाइऑक्साइड की बढ़ी हुई सांद्रता के कारण बढ़ी हुई पादप वृद्धि
Carbon fertilization (CO2 fertilization) means plants photosynthesise more, and often grow more, when the CO2 in the air rises. CO2 acts like a nutrient for plants, so the effect is on plant growth. Whether the extra photosynthesis becomes real growth still depends on temperature, moisture and nutrients.
- ✓ (a) The IPCC defines CO2 fertilization as the increase of plant photosynthesis and water-use efficiency in response to higher atmospheric CO2; it can lead to more plant growth and carbon storage.
- ✗ (b) Rising temperature from extra CO2 is the greenhouse effect (global warming), a different process.
- ✗ (c) Falling ocean pH because the sea absorbs CO2 is ocean acidification, a separate consequence of higher CO2.
- ✗ (d) 'Fertilization' refers to boosted plant growth, not to all living things adapting to climate change.
Remember · Carbon (CO2) fertilization = more atmospheric CO2 boosts plant photosynthesis and growth; warming is the greenhouse effect and ocean pH fall is acidification.
Sources
- IPCC AR6 Working Group I, Annex VII: Glossary ↗ “The increase of plant photosynthesis and water-use efficiency in response to increased atmospheric carbon dioxide (CO2) concentration. … A reduction in the pH of the ocean, accompanied by other chemical changes (primarily in the levels of carbonate and bicarbonate ions)”
Question and answer: UPSC's official GS Paper I (2018, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 30 Sept 2026 (how we verify). ·