Skip to main content

Success Stories

Join @UPSCneil — Free Guidance

Loading...

PYQ Bank
UPSC CSE Prelims
2013
Q23 — Environment & Ecology

UPSC CSE Prelims 2013 Q23 — Environment & Ecology PYQ with Answer

2013Q23·Environment & Ecology·Ecosystems & Ecology Concepts

Which one of the following is the correct sequence of ecosystems in the order of decreasing productivity?

Previous

In the grasslands, trees do not replace the grasses as a part of an ecological s...

Next

Contour bunding is a method of soil conservation used in...

Unlocking your potential through strategic mentorship and proven methodologies. Join us on your journey to the Civil Services.

+91 91130 79224
@helpdeskupsc

Quick Links

Success Stories
Blog
Videos
State PCS (HCS, UPPCS)
Mains Current Affairs
Daily Answer Writing (Mains)
How to Write Mains Answers
Mains Mock Tests (Free)
Mains Model Answers (Sample)
Toppers Answer Copies
Mains 2026 Sprint
Mains 2027 Marathon
Prelims cum Mains 2027 Timetable
Daily Current Affairs
Contact Us

PYQ Bank

UPSC Prelims PYQ
UPSC Mains PYQ
Other Exam PYQ
State PCS PYQ
Easiest State PCS Exam
State PCS Domicile Rules
IFoS English & GK PYQ
IFoS Essay Topics
IFoS Officer Salary
IFoS vs IFS (Forest vs Foreign)
PYQ Trends Analysis
Topic-wise PYQ
Practice Prelims PYQ
Practice State PCS

Our Courses

All Courses
Sherlocking Mains Programme
UPSC Coaching
UPSC Online
UPSC Mains Test Series
UPSC Prelims Test Series
IFoS Mains (English & GK)
Test Series
Sherlocking Methodology
UPSC 2026 Guide
UPSC 2027 Guide
Preparation Guide
UPSC Syllabus
UPSC Eligibility & Attempts
UPSC Age Calculator
UPSC Optional Subjects
Is Domicile Required for UPSC?
UPSC Exam Pattern
Does UPSC Normalize Marks?
Prelims Safe Score (Cut-offs)
Can an Average Student Crack UPSC?
UPSC Booklist
IAS Salary & Pay Scale
Test Series Comparison

Results & Answer Keys

UPSC 2026 Answer Key
Marks Calculator 2026
Provisional Answer Key 2026
Answer Key Objection Guide
Safe Score Analysis 2026
Disputed Questions 2026
Questions From Our Test Series
QPRep Portal Guide
Subject-Wise Analysis 2026
Question Paper PDF 2026
Prelims 2026 Analysis
Score Calculator
UPSC Result 2025
UPSC Prelims 2025 Answer Key
UPSC 2025 Marksheet
UPSC 2025 Cutoff
UPSC 2025 Toppers
IFoS Toppers Marks

© 2026 UnlockIAS. All rights reserved.

Privacy Policy Terms of Service