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Terrestrial Ecosystem

2 UPSC Prelims MCQs tagged "Terrestrial Ecosystem". Free practice with answer keys, explanations, and timed mock tests on Anantam IAS.

Agriculture and Allied Activities 56 Money, Banking and Monetary Policy 43 Environmental Pollution 43 Biotechnology 37 Parliament 33 Climate Change 32 Finance and Financial Markets 29 Emerging Technologies 28 Trade and External Sector 26 Life Sciences 26 Core Concepts and Foundational Science 20 Public Finance in India 19 International Environmental Framework 18 Continents 18 Religions in India 18 Fundamental Rights 18 Concept and Salient Features of the Constitution 17 Indian Biodiversity - Fauna 17 Renewable Energy 16 Major Physical Divisions of India 16 Multilateral Groupings 16 International Institutions 15 Art and Architecture 15 Drainage System 15 Institutional Measures for Environment Conservation 14 Regional Groupings 14 Rivers and Drainage 14 Infrastructure and Investment Models in India 14 Atmosphere 13 Space Technology 13

  1. Which of the following leaf modifications occur(s) in the desert areas to inhibit water…

    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:

    1. A2 and 3 only
    2. B2 only
    3. C3 only
    4. D1, 2 and 3
    Answer and explanation

    Correct answer: D

    Plants in arid environments have evolved adaptive features to minimize water loss through transpiration:

    ![Plant Modifications](https://d39jluplm5thpx.cloudfront.net//Plant_Modifications_ca54c03077.PNG)

    - Hard and waxy leaves have a thick cuticle and fewer stomata, reducing water loss by limiting evaporation. - Tiny leaves have a smaller surface area, which decreases the area exposed to transpiration. - Thorns, though primarily modified branches for protection, can also replace leaves in some desert plants (e.g., cacti), further reducing transpiration by limiting leaf surface area.

    Therefore, the correct answer is option (d) 1, 2 and 3.

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    Environment UPSC 2018 Easy

  2. Which of the following leaf modifications occurs/occur in desert areas to inhibit water loss?…

    Which of the following leaf modifications occurs/occur in desert areas to inhibit water loss? 1. Hard and waxy leaves 2. Tiny leaves or no leaves 3. Thorns instead of leaves Select the correct answer using the codes given below.

    1. A1 and 2 only
    2. B2 only
    3. C1 and 3 only
    4. D1, 2 and 3
    Answer and explanation

    Correct answer: D

    Statement 1 is Correct: Desert plants (xerophytes) often have a thick, waxy cuticle on their leaves which acts as a physical barrier to minimize water loss through transpiration. Statement 2 is Correct: Many desert plants have very small leaves or shed them entirely to reduce the surface area exposed to the sun, thereby significantly inhibiting water loss. Statement 3 is Correct: In several arid species, leaves are modified into thorns or spines to minimize the surface area for transpiration and to protect the plant's stored water from herbivores.

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    Environment UPSC 2013 Medium