For the measurement/estimation of which of the following are satellite images/remote sensing data used?
- 1.Chlorophyll content in the vegetation of a specific location
- 2.Greenhouse gas emissions from rice paddies of a specific location
- 3.Land surface temperatures of a specific location
Select the correct answer using the code given below.
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Answer: D. Item 1 is correct: satellites measure plant greenness and chlorophyll using reflected light (for example NDVI). Item 2 is correct: remote sensing data on rice-growing area and flooding are used to estimate methane emissions from paddies. Item 3 is correct: thermal infrared sensors measure land surface temperature. So all three.
Watch for: Students think gas emissions cannot be seen from space, but they are estimated using satellite data on paddy area and water.
Why the other options are wrong
- A. Wrong because items 2 and 3 can also be estimated from satellite data.
- B. Wrong because item 1 can also be measured by satellite.
- C. Wrong because items 1 and 2 can also be estimated.
Source to check: ISRO National Remote Sensing Centre (NRSC) website and Bhuvan portal; NCERT Class 11 Practical Work in Geography Part I, Chapter 'Introduction to Remote Sensing'
Answer from the official UPSC key. Written and fact-checked by AI against the official key. Spotted a mistake? Report it.