Acme Ai
A
अ
Question No. 8Interactive Test Mode
00:00
+2-0.66

Q8. Which of the following leaf modifications occur(s) in the desert areas to inhibit water loss? 1. Hard and waxy leaves 2. Tiny leaves 3. Thorns instead of leaves Select the correct answer using the code given below:

Which of the following leaf modifications occur(s) in the desert areas to inhibit water loss?

  1. Hard and waxy leaves
  2. Tiny leaves
  3. Thorns instead of leaves

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

Ready to check the official UPSC Answer Key?

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

Official UPSC Answer KeyUPSC Prelims 2018 • Environment and Ecology

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

Concept & Option Breakdown

Standard Reference Verified

Xerophytic adaptations to minimize transpiration and survive arid desert conditions include:

  1. Hard, thick, and waxy cuticles that reduce cutaneous water loss.
  2. Tiny, reduced leaf surface area to lower transpiration rate.
  3. Leaves modified into spines/thorns (with stems taking over photosynthesis, as in cacti) to drastically restrict moisture loss.
Reviewed by Avinash Sir & Acme AI Research Team

Practice Full-Length & Sectional Prelims Mocks on this Interface

50 simulated tests in the APT Prelims Test Series (₹1,493) or 1-on-1 Mentorship with Avinash Sir.

Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2018 (Q8)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicEnvironment and Ecology → Ecology & Ecosystems
Official Answer KeyOption (D) — 1, 2 and 3

Related & Repeated Prelims PYQs (7)

Questions from other UPSC Prelims years testing the same or closely linked concept.

View Cluster in 3D Graph
2017 • Q5781% Match

Which of the following statements can help in water conservation in agriculture? 1. Reduced or zero tillage of the land 2. Applying gypsum before irrigating th

Environment and Ecology • Natural ResourcesSolve
2016 • Q21481% Match

What is/are unique about ‘Kharai camel’, a breed found in India? 1. It is capable of swimming up to three kilometres in seawater. 2. It survives by grazing on m

Environment and Ecology • Ecology & EcosystemsSolve
2020 • Q17681% Match

With reference to India’s Desert National Park, which of the following statements are correct? 1. It is spread over two districts. 2. There is no human habitati

Environment and Ecology • Natural ResourcesSolve
2016 • Q4780% Match

Which of the following is/are the advantage/advantages of practicing drip irrigation? 1. Reduction in weed 2. Reduction in soil salinity 3. Reduction in-soil er

Indian Economy • Agriculture & Rural EconomySolve
2013 • Q1580% Match

Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to 1. Resist drought and increase absorptive area

Science and Technology • Biotechnology & GeneticsSolve
2021 • Q20380% Match

Consider the following animals: 1. Hedgehog 2. Marmot 3. Pangolin To reduce the chance of being captured by predators, which of the above organisms rolls up/ro

Environment and Ecology • Biodiversity & ConservationSolve
2011 • Q5980% Match

With reference to micro-irrigation, which of the following statements is/are correct? 1. Fertilizer/nutrient loss can be reduced. 2. It is the only means of ir

Environment and Ecology • Natural ResourcesSolve

More PYQs from Environment and Ecology (Ecology & Ecosystems)

Master the Environment and Ecology syllabus cluster by practicing these related previous year questions.

View All Environment and Ecology PYQs
2022 • Q1Ecology & Ecosystems

Which of the following are nitrogen-fixing plants? 1. Alfalfa 2. Amaranth 3. Chickpea 4. Clover 5. Purslane (Kulfa) 6. Spinach Select the correct ans

Environment and EcologyPractice
2021 • Q2Ecology & Ecosystems

In nature, which of the following is/are most likely to be found surviving on a surface without soil? 1. Fern 2. Lichen 3. Moss 4. Mushroom Select th

Environment and EcologyPractice
2021 • Q3Ecology & Ecosystems

Consider the following kinds of organisms: 1. Copepods 2. Cyanobacteria 3. Diatoms 4. Foraminifera Which of the above are primary producers in the fo

Environment and EcologyPractice
2021 • Q4Ecology & Ecosystems

Which of the following are detritivores? 1. Earthworms 2. Jellyfish 3. Millipedes 4. Seahorses 5. Woodlice Select the correct answer using the code g

Environment and EcologyPractice
2021 • Q5Ecology & Ecosystems

In which one of the following biogeochemical cycles, the weathering of rocks is the main source of release of nutrients to enter the cycle?

Environment and EcologyPractice
2021 • Q6Ecology & Ecosystems

Which of the following have species that can establish a symbiotic relationship with other organisms? 1. Cnidarians 2. Fungi 3. Protozoa Select the c

Environment and EcologyPractice
2021 • Q7Ecology & Ecosystems

With reference to the water on the planet Earth, consider the following statements: 1. The amount of water in the rivers and lakes is more than the am

Environment and EcologyPractice
2017 • Q9Ecology & Ecosystems

The term ‘M-STrIPES’ is sometimes seen in the news in the context of

Environment and EcologyPractice

Frequently Asked Questions — UPSC Prelims 2018 Q8

What is the official answer for UPSC Prelims 2018 GS Paper I Question 8 (Environment and Ecology)?

The official UPSC answer key for this 2018 Environment and Ecology (Ecology & Ecosystems) 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 2018 question belong to?

This question belongs to GS Paper I under the subject "Environment and Ecology" and micro-topic "Ecology & Ecosystems". You can explore all repeated questions from Ecology & Ecosystems 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 Ecology & Ecosystems UPSC Prelims question using option elimination?

To solve Ecology & Ecosystems questions in UPSC Prelims, identify extreme modifiers, verify core NCERT conceptual definitions, and eliminate mutually contradictory statement pairs before locking your final option.

Beyond Previous Year Questions

Structured Prelims Practice & Mentorship

Pair previous year question analysis with full-length simulated mock tests and 1-on-1 faculty guidance.

APT 2027 • 50 Prelims Tests17% OFF

Acme Prelims Test Series (APT)

Built to eliminate 1/3rd negative marking losses and 50–50 option traps through structured simulation and NCERT-backed keys.

  • 50 High-Yield Tests: Subject Sectionals, Current Affairs, CSAT Paper II & Full-Length Simulators
  • 1/3rd Penalty & Trap Analytics: Identify whether marks are lost to over-attempting or conceptual gaps
  • Option-by-Option NCERT Keys: Detailed distractor analysis and elimination logic for every question
  • Custom PDF-to-Mock Generator: Convert your revision notes or current affairs PDFs into practice tests
Complete 50-Test Package
₹1,493₹1,799• Valid till Prelims 2027
1-on-1 Personal MentorshipCapped at 10 Seats

1-on-1 UPSC Mentorship with Avinash Sir

Weekly 1-on-1 strategy reviews, daily study accountability, and personalized MCQ attempt audits with an experienced UPSC mentor.

  • Weekly 1-on-1 Sessions: Direct mentorship with Avinash Sir (Former Plutus IAS Mentor, UPSC & UPPCS Mains Written)
  • APT 50-Test Series Included: Full Prelims GS1 & CSAT test series bundled at no additional cost
  • Mock Attempt & Elimination Audit: Question-by-question review to calibrate your risk and attempt accuracy
  • Prelims & Integrated Tracks: Available as dedicated Prelims mentorship or end-to-end Prelims + Mains guidance
Prelims & Integrated Tracks
17% OFF• Includes APT 50-Test Series