B.Com BCH 101 - Environmental Science Quiz

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Questions and Answers

What is a direct consequence of converting grasslands into irrigated farmlands?

  • Increase in soil salinity (correct)
  • Higher capacity for wildlife habitat
  • Improvement in biodiversity
  • Enhanced grassland regeneration

Which of the following practices negatively affects grassland ecosystems?

  • Overgrazing by domestic animals (correct)
  • Planting grass species
  • Lighting fires during the winter
  • Controlled grazing

Why is it essential to protect less disturbed grassland patches?

  • They can easily be converted into industrial areas.
  • They offer recreational opportunities only.
  • They retain unique plants and animals. (correct)
  • They are more productive for agriculture.

What happens to grasslands when they are frequently burned and overgrazed?

<p>They deteriorate and become barren. (D)</p> Signup and view all the answers

Which human activity poses a serious threat to grassland ecosystems?

<p>Conversion to industrial areas (B)</p> Signup and view all the answers

What are the three levels of biological diversity?

<p>Genetic, species, and ecosystem diversity (B)</p> Signup and view all the answers

Which of the following is considered a major threat to biodiversity?

<p>Habitat loss (B)</p> Signup and view all the answers

What is the main focus of in-situ conservation methods?

<p>Protecting species within their natural habitats (A)</p> Signup and view all the answers

Which appropriation relation has been adopted for pollution control under Indian law?

<p>Water (Prevention and Control of Pollution) Act (B)</p> Signup and view all the answers

India is known as a mega-biodiversity nation primarily due to its:

<p>High number of endemic species (C)</p> Signup and view all the answers

Which of the following is a type of environmental pollution?

<p>Soil pollution (A)</p> Signup and view all the answers

What did the Chipko movement primarily focus on?

<p>Forest conservation (B)</p> Signup and view all the answers

What is a characteristic feature of a forest ecosystem?

<p>It consists of layers from the ground to the canopy. (B)</p> Signup and view all the answers

Which of the following ecosystems can be considered a modified ecosystem?

<p>Urban areas (B)</p> Signup and view all the answers

What aspect of ecosystems do biogeochemical cycles and energy transfer mechanisms primarily describe?

<p>How ecosystems function and interact. (A)</p> Signup and view all the answers

Which type of species is often most abundant in an ecosystem?

<p>Insects (B)</p> Signup and view all the answers

What is essential for the maintenance of human life and civilization according to the ecosystem's role?

<p>Natural ecosystems (C)</p> Signup and view all the answers

What defines the composition of an ecosystem's biotic components?

<p>The variety and abundance of plant and animal species. (D)</p> Signup and view all the answers

Which statement best describes a food chain within an ecosystem?

<p>It involves energy transfer from producers to consumers. (C)</p> Signup and view all the answers

What are abiotic components of an ecosystem?

<p>Non-living components like air, water, and soil. (A)</p> Signup and view all the answers

What can be inferred about the interaction between biotic and abiotic components in an ecosystem?

<p>Their interaction is vital for ecosystem functioning. (C)</p> Signup and view all the answers

What distinguishes a forest ecosystem from others?

<p>It has both abiotic and biotic components. (C)</p> Signup and view all the answers

Which factor does NOT influence the type of forest in a region?

<p>Type of animal species (B)</p> Signup and view all the answers

Which of the following correctly identifies a type of forest in India?

<p>Coniferous and Broadleaved forests (A)</p> Signup and view all the answers

What is the main characteristic of coniferous forests?

<p>They contain trees with needle-like leaves. (C)</p> Signup and view all the answers

Which of the following areas is known for its evergreen forests?

<p>The Western Ghats (A)</p> Signup and view all the answers

Which trees are typically found in arid areas?

<p>Thorn trees (D)</p> Signup and view all the answers

The presence of which animal is characteristic of the Himalayan region?

<p>Snow Leopard (C)</p> Signup and view all the answers

Which statement about broadleaved forests is true?

<p>They have large leaves of various shapes. (D)</p> Signup and view all the answers

Which classification does NOT apply to the forests of India?

<p>Sclerophyllous (A)</p> Signup and view all the answers

In which region do mangrove trees primarily grow?

<p>River deltas (C)</p> Signup and view all the answers

What does a food chain illustrate?

<p>The flow of food energy between species (C)</p> Signup and view all the answers

Which of the following describes a food web?

<p>A series of interconnected food chains (B)</p> Signup and view all the answers

In a marine environment, which organism serves as the primary producer?

<p>Phytoplankton (D)</p> Signup and view all the answers

What is the initial stage of ecological succession following a disturbance?

<p>Pioneer stage (C)</p> Signup and view all the answers

Which factor can influence ecological succession?

<p>Seasonal environmental changes (B)</p> Signup and view all the answers

Which of the following best describes a climax stage in succession?

<p>A stable end point of community development (B)</p> Signup and view all the answers

What is the main difference between natural vegetation and planted trees?

<p>Natural vegetation is more diverse (A)</p> Signup and view all the answers

During succession in a pond ecosystem, what happens after the aquatic stage?

<p>It transitions back to a dry terrestrial habitat (D)</p> Signup and view all the answers

What characterizes the seral stages in an ecosystem?

<p>They follow the pioneer stage in succession (B)</p> Signup and view all the answers

What is the consequence of forest clearing on ecological succession?

<p>It initiates an orderly process of community development (B)</p> Signup and view all the answers

Flashcards

Biodiversity

The variety of life on Earth at different levels, including genetic diversity within species, diversity of species, and diversity of ecosystems.

Biodiversity Hotspot

Areas with a high concentration of endemic species (unique to a specific region) that are threatened by human activities.

In situ conservation

The practice of protecting biodiversity in its natural environment, like national parks or wildlife sanctuaries.

Ex situ conservation

The practice of protecting biodiversity outside its natural environment, like in zoos, botanical gardens, or gene banks.

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Ecosystem Services

The many benefits humans derive from ecosystems, including clean air and water, food, medicine, and natural beauty.

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Climate Change

The increasing amount of greenhouse gases in the atmosphere, leading to an overall warming effect on the planet.

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Wildlife Protection Act

A law aimed at protecting and conserving India's diverse wildlife, including endangered and vulnerable species.

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Ecosystem

A community of living organisms (plants, animals, microorganisms) interacting with their physical environment (soil, water, air).

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Natural Ecosystems

Ecosystems that have not been significantly altered by human activity, like forests, grasslands, deserts, and oceans.

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Man-Modified Ecosystems

Ecosystems altered by human activity, like farms, cities, and industrial areas.

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Ecosystem Structure

The structure or arrangement of an ecosystem, like the layers of a forest, the zones of a pond, or the changes in vegetation on a mountain.

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Ecosystem Composition

The types of plants and animals found in an ecosystem.

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Ecosystem Function

The interconnected processes that keep an ecosystem functioning, like energy flow, nutrient cycling, and food chains.

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Energy Flow

The transfer of energy from the sun to producers (plants) to consumers (animals) and decomposers.

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Biogeochemical Cycles

The continuous circulation of essential elements like carbon, nitrogen, and phosphorus through the ecosystem.

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Food Chain

A series of organisms that eat each other, like a plant being eaten by a herbivore, which is eaten by a carnivore.

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What is a food chain?

A diagram that shows the flow of energy from one organism to another in an ecosystem.

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What is a food web?

A network of interconnected food chains within an ecosystem.

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What is ecological succession?

The process of change in an ecosystem over time, leading to a more stable state.

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What is the pioneer stage?

The initial stage of succession, characterized by simple organisms like grasses and mosses.

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What is the climax stage?

The most stable and mature stage of ecological succession.

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What is an ecosystem?

A community of plants and animals living in a specific environment.

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What are phytoplankton?

Tiny aquatic plants that are the base of the food chain in marine environments.

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What is a forest ecosystem?

A type of ecosystem dominated by trees, shrubs, and other plants.

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How does succession occur in a forest?

The gradual process of change within a forest ecosystem.

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How are forests defined?

Plant communities that are predominantly structurally defined by trees.

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Grassland Conversion

The process where land originally used for natural grasslands is converted into artificial farmlands, often for growing crops like sugarcane.

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Overgrazing

The degradation of grasslands caused by exceeding the carrying capacity of the land with livestock, leading to a loss of nutritious grasses and soil compaction.

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Frequent Fires in Grasslands

The negative impact on grasslands caused by repeated fires, which while initially providing a flush of new growth, eventually lead to soil degradation and loss of vegetation.

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Sensitivity of Desert Ecosystems

Deserts and semi-arid regions are highly specialized ecosystems that are easily destroyed by human activities, as the species residing there are adapted to specific conditions.

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Grassland Industrialization

The process where grasslands are transformed into industrial areas, leading to short-term economic gains but causing long-term ecological and economic losses.

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What are abiotic factors in a forest ecosystem?

Abiotic factors are the non-living components of an ecosystem, including things like climate, soil, rainfall, and temperature.

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What are biotic factors in a forest ecosystem?

Biotic factors are the living components of an ecosystem, including plants, animals, fungi, and bacteria.

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How does climate influence forest types?

The type of forest depends on the specific climatic conditions of the area, including temperature and rainfall.

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How does soil affect forest ecosystems?

The type of soil can influence which plants grow in a forest, impacting the overall plant community.

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What are coniferous forests?

Coniferous forests, characterized by trees with needle-like leaves, are found in regions with cold temperatures, like the Himalayas.

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What are broadleaved forests?

Broadleaved forests encompass several subtypes, including evergreen and deciduous forests, and they are known for their large, varied leaves.

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What are evergreen forests?

Evergreen forests, characterized by trees that retain their leaves year-round, are found in high-rainfall regions of the Western Ghats, Northeast India, and the Andaman and Nicobar Islands.

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What are deciduous forests?

Deciduous forests are characterized by trees that lose their leaves seasonally, typically during autumn.

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What are mangrove forests?

Mangrove forests are adapted to grow in salty, coastal environments, often found in river deltas.

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Study Notes

B.Com (Honours) BCH 101 - Environmental Science 1st Semester

  • Course is offered by Arunodaya University, School of Arts, Humanities and Social Science.
  • Syllabus includes eight units.
  • Unit 1 covers introduction to environmental studies
  • Unit 2 covers ecosystems (forest, grassland, desert, aquatic)
  • Unit 3 is about natural resources (renewable and non-renewable)
  • Unit 4 covers biodiversity and conservation
  • Unit 5 deals with environmental pollution
  • Unit 6 covers environmental policies and practices
  • Unit 7 covers human communities and the environment
  • Unit 8 is about fieldwork

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