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Chapter 1: The Living World
Biodiversity; Need for classification; three domains of life; taxonomy and systematics; concept of species and taxonomical hierarchy; binomial nomenclature.
17
Chapter 2: Biological Classification
Five kingdom classifications; Salient features and classification of Monera, Protista and Fungi; Lichens, Viruses and Viroids.
28
Chapter 3: Plant Kingdom
Classification into major groups; Features and examples of Algae, Bryophyta, Pteridophyta, Gymnospermae (Excluded: Angiosperms, Plant Life Cycle & Alternation of Generations).
24
Chapter 4: Animal Kingdom
Salient features and classification: Non-chordates up to phyla level and chordates up to class level; examples of each. (No live specimens to be displayed).
34
Chapter 5: Morphology of Flowering Plants
Morphology of root, stem, leaf, inflorescence, flower, fruit, seed; description of family Solanaceae.
46

Economic and Ecological Importance of Lichens

Economic & Ecological Importance of Lichens — CBSE Class 11 Biology 30 MCQ Quiz

Unit 1: Diversity of Living Organisms — Chapter 2: Biological Classification

CBSE Class 11 — Subject: Biology

30:00

Questions: 30 | Duration: 30 minutes

1. Lichens are important pioneers because they:

Fix nitrogen for animals Initiate soil formation by weathering rocks Consume organic matter rapidly Produce large woody stems

2. Which lichen-derived substance has been traditionally used to make litmus paper (pH indicator)?

Usnic acid Penicillin Orcein / litmus dyes from Roccella and related lichens Citric acid

3. Which economic use of lichens is correctly matched?

Dyes and perfumes — Roccella and Evernia Large-scale food crops — Parmelia Industrial enzymes — Usnea Petroleum production — Cladonia

4. Lichens serve as food for certain animals; which is a classic example?

Cow feeding on Usnea Fish consuming crustose lichens Birds eating Apothecia only Reindeer feeding on Cladonia (reindeer lichen)

5. Which role of lichens contributes directly to nutrient cycling in ecosystems?

Producing fossil fuels Fixing atmospheric oxygen Causing deforestation Adding organic matter during decomposition and soil formation

6. Lichens are widely used as bioindicators because they are very sensitive to:

Soil nutrients only Air pollution (sulphur dioxide, heavy metals) Water salinity only Temperature only

7. Which industry historically relied on lichens for natural dyes?

Textile and dye industry (orchil, litmus) Steel manufacturing Automobile industry Silicon chip fabrication

8. Some lichens are sources of antibiotics or antimicrobial compounds. Which lichen substance is known for biological activity?

Cellulose Agar Citric acid Usnic acid

9. Which traditional use of lichens is correctly matched?

Litmus — Parmelia Litmus/orchella — Roccella Bread making — Usnea Engine lubricant — Cladonia

10. Lichens aid in rock weathering primarily by:

Physical shredding by roots Attracting large animals to erode rock Chemical secretion (organic acids) and expansion-contraction cycles Producing strong enzymes that dissolve metal

11. Which lichen product has been used in traditional medicine for its antiseptic properties?

Usnic acid from Usnea Aflatoxin from Aspergillus Penicillin from Penicillium Citric acid from Aspergillus

12. Lichens contribute to human economy by being used in:

Large-scale timber production Dyes, perfumes, traditional medicines and scientific indicators Production of petroleum Manufacturing of electronics

13. Which statement about lichens and air quality monitoring is correct?

Lichens thrive in polluted air Lichens are unaffected by sulphur dioxide Decline in lichen diversity indicates increased air pollution Lichens remove sulphur dioxide from atmosphere completely

14. Which lichen type is commonly harvested for dyes and was historically important in the dye trade?

Roccella (orchil-producing lichens) Cladonia (reindeer lichens) Parmelia only Usnea only

15. Lichens enhance biodiversity by:

Reducing the number of insect species Providing microhabitats and food for invertebrates and small animals Eliminating mosses on rocks Producing large trees

16. Which of these is NOT an economic use of lichens?

Source of natural dyes Perfume industry ingredients Major source of construction materials Traditional medicines

17. Lichens used in perfume and cosmetic industries are valued for:

High protein content Fragrant secondary metabolites and fixatives Their large size Their ability to ferment sugars

18. Which human activity can reduce lichen diversity in an area?

Increasing air pollution (SO2, NOx) Planting more trees only Adding more lichens artificially Controlled organic farming

19. Lichens on rock surfaces can chemically weather rocks by producing:

Strong acids like sulfuric acid only Enzymes that dissolve metals Organic acids and chelating compounds Large amounts of oxygen to oxidize rocks

20. Why are lichens useful in archaeological studies and dating old structures?

They preserve ancient DNA in stones Lichen growth rates (lichenometry) can estimate age of exposed surfaces They mark magnetic field reversals They produce carbon-14 for dating

21. Which genus is a classic source of orcein and related dyes used historically?

Roccella Usnea Cladonia Parmelia

22. Which lichen component directly provides carbohydrates to the fungal partner?

Medulla Cortex only Photobiont (algal/cyanobacterial) cells Rhizines

23. Lichens used as bioindicators often accumulate which pollutants in their tissues?

Organic fertilizers only Heavy metals (lead, mercury) and sulphur compounds Large plastics only Pesticides only

24. Lichenometry (using lichen size to estimate exposure age) is particularly useful in:

Dating recent glacial moraines and exposed rock surfaces Dating deep geological strata millions of years old Measuring tree age in forests Estimating soil organic content

25. Which statement is true about sustainable harvesting of lichens for economic use?

Lichens regenerate overnight after harvesting Harvesting has no ecological impact Overharvesting can reduce local biodiversity and ecosystem services Lichens are invasive and should be removed

26. Which of the following best describes the role of lichens in food webs?

Lichens are top predators They provide primary production and food for herbivores in some ecosystems They exclusively decompose wood They prevent all herbivory

27. Which of these lichens has commercial value in perfume and fragrance industries?

Evernia (oakmoss) and related species Cladonia only Parmelia only Usnea only

28. Which conservation measure helps preserve lichen diversity?

Increasing air pollution Clear-cutting old growth forests Reducing industrial emissions and protecting habitats Introducing non-native lichens

29. Which lichen attribute makes them particularly good at accumulating airborne pollutants?

Fast growth and high biomass turnover High surface area and lack of roots (direct absorption) Being submerged in water Producing seeds that trap pollutants

30. Summarise the overall importance of lichens in ecosystems and economy:

Only harmful and toxic organisms Only decorative organisms with no function Provide ecological services (pioneers, bioindicators, nutrient cycling) and economic products (dyes, perfumes, medicines) Only fossil fuel sources

Prepared fully as per NCERT syllabus — practice for CBSE Board & NEET-UG aspirants.

Titles

Economic & Ecological Importance of Lichens MCQs — CBSE Practice Test
Lichens Importance — 30-Question Timed MCQ Quiz (Class 11)
CBSE Class 11 Biology: Lichens Importance Quiz with Automatic Scoring
NEET-UG Ready: Economic & Ecological Importance of Lichens MCQs
NCERT Aligned Quiz: Economic and Ecological Importance of Lichens (MCQs)

Introduction Paragraph
The Economic and Ecological Importance of Lichens MCQs set is designed strictly from the NCERT Class 11 Biology syllabus to help students master how lichens function as pioneers, bioindicators, and sources of dyes, perfumes and medicinal compounds. This 30-question timed online practice test offers automatic scoring and instant per-question feedback, enabling rapid self-assessment and targeted revision. Ideal for CBSE Class 11 board exam preparation and NEET-UG aspirants, the quiz builds speed, accuracy and conceptual clarity under exam-like conditions. Each item includes concise NCERT-style explanations after submission so learners can reinforce weak areas and track progress efficiently. Suitable for classroom practice, homework or focused self-study, it supports regular revision cycles.

Tags
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Keywords
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