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GS Paper IUPSC Prelims 2007
Health & Medicine
Question No. 383Interactive Test Mode
00:00
+2-0.66

Q383. Which of the following types of light are strongly absorbed by plants?

Which of the following types of light are strongly absorbed by plants?

Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2007 • Science and Technology

Correct Answer: Option (B) — Blue and red

Concept & Option Breakdown

Standard Reference Verified

Plant photosynthetic pigments (chlorophyll a and chlorophyll b) have primary absorption peaks in the blue (430–450 nm) and red (640–680 nm) regions of the visible spectrum. Green light is largely reflected and transmitted, which is why plant foliage appears green.

Elimination Heuristic & Exam Approach

Photosynthetically Active Radiation (PAR) is most effectively absorbed in the blue and red spectral regions, while green light is reflected.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2007 (Q383)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — Blue and red

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Frequently Asked Questions — UPSC Prelims 2007 Q383

What is the official answer for UPSC Prelims 2007 GS Paper I Question 383 (Science and Technology)?

The official UPSC answer key for this 2007 Science and Technology (Health & Medicine) question is Option (B): "Blue and red". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2007 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?

Photosynthetically Active Radiation (PAR) is most effectively absorbed in the blue and red spectral regions, while green light is reflected.

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