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Question No. 76Interactive Test Mode
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Q76. 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.

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.
Select the correct option below (or cross out options to eliminate)

Official Answer Key & Detailed Solution

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Click any option above to test yourself under exam conditions, or reveal the explanation directly.

Official UPSC Answer KeyUPSC Prelims 2019 • Science and Technology

Correct Answer: Option (D) — 1, 2 and 3

Concept & Option Breakdown

Standard Reference Verified

Statement 1 is correct: Multispectral and hyperspectral satellite sensors estimate chlorophyll concentration by measuring spectral reflectance in the visible and near-infrared bands (e.g., NDVI and red-edge indices).

Statement 2 is correct: Earth observation satellites equipped with atmospheric trace gas spectrometers and optical sensors measure agricultural inundation patterns and greenhouse gas concentrations (such as methane emissions from flooded paddy fields).

Statement 3 is correct: Thermal infrared (TIR) sensors on remote sensing satellites measure emitted radiance from the Earth's surface to derive accurate land surface temperature (LST) profiles for climate and urban heat island studies.

Elimination Heuristic & Exam Approach

Remote sensing capabilities cover broad spectral bands: visible/NIR for chlorophyll, thermal infrared for surface temperatures, and atmospheric spectroscopy for GHGs.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2019 (Q76)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — 1, 2 and 3

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Frequently Asked Questions — UPSC Prelims 2019 Q76

What is the official answer for UPSC Prelims 2019 GS Paper I Question 76 (Science and Technology)?

The official UPSC answer key for this 2019 Science and Technology (Health & Medicine) question is Option (D): "1, 2 and 3". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2019 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Health & Medicine UPSC Prelims question using option elimination?

Remote sensing capabilities cover broad spectral bands: visible/NIR for chlorophyll, thermal infrared for surface temperatures, and atmospheric spectroscopy for GHGs.

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