Environmental Science and Ecosystem Overview
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Questions and Answers

Which of the following is NOT a characteristic of freshwater ecosystems?

  • They include marine species adapted to high salt concentrations. (correct)
  • They primarily consist of flowing water bodies.
  • They contain standing water bodies such as lakes and ponds.
  • They cover about 1 percent of the earth's surface.
  • Which organisms are typically found in lotic ecosystems?

  • Trout and stoneflies (correct)
  • Coral and seabed dwellers
  • Amphibians and rooted plants
  • Beavers and river dolphins
  • What distinguishes lentic ecosystems from lotic ecosystems?

  • Lentic ecosystems consist of flowing water bodies.
  • Lentic ecosystems encompass stationary water bodies. (correct)
  • Lentic ecosystems thrive in high-salinity conditions.
  • Lentic ecosystems only exist in marine environments.
  • Which of the following environments is NOT a type of marine habitat?

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

    Which factor makes it challenging for freshwater organisms to survive in marine habitats?

    <p>Higher salt concentrations (B)</p> Signup and view all the answers

    What is the core focus of Environmental Science?

    <p>The relationship between humans and both living and non-living parts of the environment (A)</p> Signup and view all the answers

    Which of the following best defines Environmental Engineering?

    <p>The implementation of engineering methods to solve environmental problems (A)</p> Signup and view all the answers

    What does the Environment (Protection) Act, 1986 describe as the environment?

    <p>The sum of water, air, land, and their interrelationships with various entities (B)</p> Signup and view all the answers

    Which component is NOT included in the definition of the environment?

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

    What is the primary goal of Environmental Studies?

    <p>To educate individuals on environmental quality preservation (B)</p> Signup and view all the answers

    The term 'biocentric' best relates to which aspect of environmental science?

    <p>The focus on living organisms and their relationships (C)</p> Signup and view all the answers

    Which option accurately describes an interdisciplinary approach in Environmental Science?

    <p>Integrating physics, biology, and geography for environmental study (D)</p> Signup and view all the answers

    What type of vegetation predominates in grassland ecosystems?

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

    Which of the following animals are commonly found grazing in grasslands?

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

    What is a primary function of grassland ecosystems?

    <p>Energy flow through the food chain (A)</p> Signup and view all the answers

    How do grasslands help in maintaining soil quality?

    <p>By increasing the fertility of the soil (D)</p> Signup and view all the answers

    Which human activity significantly threatens grassland ecosystems?

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

    What is one significant economic use of grasslands for rural communities?

    <p>Grazing areas for domestic animals (D)</p> Signup and view all the answers

    Which characteristic distinguishes tropical grasslands from other ecosystems?

    <p>Tall grass heights of 3 to 4 metres (A)</p> Signup and view all the answers

    What role do carnivorous animals in grasslands primarily serve?

    <p>Controlling insect pests (C)</p> Signup and view all the answers

    In terms of climate, how are grasslands generally classified?

    <p>By their regional climate (temperate or tropical) (B)</p> Signup and view all the answers

    What is a common characteristic of the fauna in grassland ecosystems?

    <p>High diversity of rodents, reptiles, and insects (B)</p> Signup and view all the answers

    Which component of an ecosystem is responsible for synthesizing food using sunlight?

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

    What characterizes the dynamic nature of ecosystems?

    <p>Ecosystems undergo succession and changes. (B)</p> Signup and view all the answers

    Which of the following is NOT a role of decomposers in an ecosystem?

    <p>Synthesizing their own food. (C)</p> Signup and view all the answers

    What type of organisms are considered consumers in an ecosystem?

    <p>Organisms that obtain food by feeding on others. (C)</p> Signup and view all the answers

    Which abiotic factor does NOT belong to climatic factors in an ecosystem?

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

    What term refers to organisms that cannot synthesize their own food?

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

    Which of the following is an example of a chemoautotroph?

    <p>Bacteria in deep-sea vents (C)</p> Signup and view all the answers

    What role do producers play in an ecosystem?

    <p>Provide energy for consumers through photosynthesis. (D)</p> Signup and view all the answers

    Which of these factors does NOT affect the flow rates of nutrients in an ecosystem?

    <p>Generation of solar energy (B)</p> Signup and view all the answers

    Which animals are commonly found in tropical grasslands?

    <p>Elephants and zebras (C)</p> Signup and view all the answers

    What characterizes the vegetation of temperate grasslands?

    <p>Short and nutritious grass (B)</p> Signup and view all the answers

    Which type of grasslands is primarily found in India?

    <p>Village grazing grounds and alpine pastures (A)</p> Signup and view all the answers

    Which herbivores are typically found in grassland ecosystems?

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

    What is a defining feature of desert ecosystems?

    <p>Low annual rainfall and high evaporation rates (A)</p> Signup and view all the answers

    Which plant adaptations are typical in desert ecosystems?

    <p>Absence of leaves and thickened stems (C)</p> Signup and view all the answers

    Which type of organisms serve as decomposers in desert ecosystems?

    <p>Some fungi and bacteria (C)</p> Signup and view all the answers

    What ecological role do dry conditions in deserts promote?

    <p>Formation of important minerals (B)</p> Signup and view all the answers

    What important mineral accumulation occurs in desert soils?

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

    What characterizes the aquatic ecosystem?

    <p>Water-based habitat (B)</p> Signup and view all the answers

    Flashcards

    Environment Definition

    The sum of water, air, land, and their relationships among them and with humans, other living organisms, and materials.

    Environmental Science

    The study of the environment, its living and non-living parts, and their relationships.

    Environmental Engineering

    Using engineering to protect and improve the environment and public health.

    Environmental Studies

    Educating people to protect the environment.

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    Environment

    Social, cultural, and physical conditions surrounding and influencing the survival of living things.

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    Ecosystem

    A community of living organisms interacting with each other and their physical environment.

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    Earth-life support system

    Earth's system that provides conditions necessary for life.

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    Abiotic components

    Non-living components of an ecosystem, such as light, temperature, and soil.

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    Biotic components

    Living components of an ecosystem, such as plants, animals, and microorganisms.

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    Producers (Autotrophs)

    Organisms that make their own food, typically through photosynthesis.

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    Consumers (Heterotrophs)

    Organisms that get their energy by eating other organisms.

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    Decomposers

    Organisms that break down dead organisms and waste, returning nutrients to the soil.

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    Energy flow

    The transfer of energy through an ecosystem.

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    Cycling of matter

    The continuous movement of chemicals through an ecosystem.

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    Photosynthesis

    The process plants use to make food from sunlight, water, and carbon dioxide.

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    Grassland Ecosystem Plants

    Dominated by grasses, with scattered drought-resistant trees in tropical regions.

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    Grassland Animals

    Support a diverse range of animals like herbivores (e.g., zebras, antelopes), rodents, reptiles, and insects.

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    Grassland Ecosystem Functions

    Involve energy flow, nutrient cycling, ecological succession, and maintaining balance. They improve soil fertility and reduce mineral leaching.

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    Economic Importance of Grasslands

    Provide grazing land for livestock, fodder for animals, and resources like fuelwood and thatch.

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    Overgrazing Impact

    Can degrade grasslands due to domestic livestock.

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    Grassland Insect Control

    Grasslands support insect predators which help manage insect pests in nearby farms.

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    Tropical Grassland Location

    Occur near the equator and in areas with moderate to low rainfall.

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    Tropical Grassland Height

    Grass can grow to 3-4 meters tall.

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    Temperate vs. Tropical Grasslands

    Grasslands are classified based on climate, with temperate types found in temperate regions.

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    Savannah Grasslands

    A type of tropical grassland, common in Africa.

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    Temperate Grassland Location

    Found in mid-latitude zones, usually in the interior of continents.

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    Temperate Grassland Grass

    Typically short and nutritious, providing food for a variety of herbivores.

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    Temperate Grassland Animals

    Home to animals like wild buffaloes, bison, and antelopes.

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    Indian Grasslands

    Found in various regions of India, including grazing grounds, low pastures, and the Himalayas.

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    Dominant Plant in Indian Grasslands

    Perennial grasses form the main plant community.

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    Desert Ecosystem Rainfall

    Annual rainfall is low, ranging from 250 to 500 mm, and evaporation is high.

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    Desert Ecosystem Characteristics

    Characterized by extremely hot days and cold nights.

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    Desert Ecosystem Soil

    Soil is poor in organic matter but rich in minerals.

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    Desert Adaptations

    Desert plants have adapted to dryness, often having few or no leaves.

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    Desert Ecosystem Producers

    Include adapted plants like cacti, shrubs, grasses, and some lichens.

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    Aquatic Ecosystem

    A community of living organisms in water, interacting with each other and their environment.

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    Nekton, Plankton, Benthos

    Three types of aquatic organisms: Nekton (active swimmers), Plankton (drifting organisms), Benthos (bottom dwellers).

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    Freshwater Ecosystem Types

    Freshwater ecosystems are classified into: Lentic (still water, like lakes), Lotic (flowing water, like rivers), and Wetlands (transitional areas between land and water).

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    Marine Ecosystem

    The vast saltwater environment covering most of Earth's surface, including oceans, seas, and the intertidal zone.

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    Salt Concentration Difference

    Freshwater creatures have a hard time surviving in saltwater, and vice versa, due to differences in salt concentration.

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    Study Notes

    Environment and Ecosystem

    • Environment originated from the French word "Environner", meaning to encircle or surround.
    • Environment (Protection) Act, 1986 defines environment as the sum of water, air, and land, and their interrelationships with human beings, other living organisms, and materials.
    • Environment encompasses social, cultural, and physical conditions surrounding, affecting, and influencing survival, growth, and development of people, animals, and plants.

    Environmental Science

    • Environmental science is an interdisciplinary study of the environment, its biotic and abiotic components, and their relationships.
    • It integrates physics, biology, and geography to study the environment and solve environmental problems.
    • Environmental science examines how humans interact with the living and non-living components of their environment.

    Environmental Engineering

    • Environmental Engineering applies engineering principles to protect and enhance environmental quality, and to improve public health and welfare.

    Environmental Studies/Education

    • Environmental studies aim to educate people about preserving environmental quality.

    Scope of Environmental Science

    • Awareness and sensitivity towards environmental problems
    • Active participation in environmental protection
    • Developing skills to solve environmental issues
    • Understanding the importance of conserving natural resources.
    • Assessing environmental programs (considering social, economic, ecological, and aesthetic factors).
    • Promoting cooperation (local, national, and international) for environmental prevention and solutions.
    • Providing a clear picture of available resources and understanding environmental situations.
    • Providing an understanding of the interconnectedness of nature and people.

    Importance of Environmental Science

    • Directly relates to quality of life
    • Importance of sustainable development
    • Knowledge of various environmental types and effects of hazards
    • Understanding the effective role in protecting the environment and promoting changes in laws and enforcement systems
    • Promoting respect and concern for the environment

    Earth Life Support Systems

    • The Earth system comprises the geosphere, atmosphere, hydrosphere, and biosphere.
    • These components are interconnected and support life through energy flow (from the sun), nutrient cycling, and gravity.
    • The major elements/spheres of the environment include: atmosphere, hydrosphere, lithosphere, and biosphere.

    Atmosphere

    • The atmosphere is a layer of air up to 1500 km surrounding Earth.
    • It has distinct layers based on temperature variations (exosphere, thermosphere, mesosphere, stratosphere, troposphere).
    • Oxygen is essential for living beings; carbon dioxide is vital for plants.
    • Dust particles influence precipitation, and water vapor impacts plant and animal life; ozone protects from harmful UV rays.

    Hydrosphere

    • Hydrosphere encompasses all liquid and frozen surface waters (oceans, rivers, lakes, groundwater.)
    • It plays a vital role in human life through drinking water, food, transport, and more.
    • The water cycle (hydrological cycle) is an important process in the hydrosphere, influencing weather patterns and all life cycles.

    Lithosphere

    • The lithosphere is the solid part of the Earth, including the crust and uppermost mantle.
    • It is significant due to tectonic plate activity and its role of supporting life.

    Biosphere

    • The biosphere is the zone where the lithosphere, hydrosphere, and atmosphere interact.
    • It supports all forms of life.

    Ecosystem

    • Ecosystem is a natural unit composed of biotic and abiotic components.
    • It includes interactions between living organisms (plants, animals, microorganisms) and nonliving components (soil, water, air, sunlight) which exchange materials to form a stable system
    • Example, a pond ecosystem

    Ecosystem Structure

    • Abiotic Components:

      • Climatic factors: rain, light, wind, temperature
      • Edaphic factors: soil pH, soil minerals, soil water
      • Topographical factors: aspect, altitude
    • Biotic Components:

      • Producers (autotrophs): plants, algae, that manufacture food
      • Consumers (heterotrophs): herbivores, carnivores, omnivores, that consume food
      • Decomposers (saprotrophs): bacteria and fungi that break down organic matter

    Ecosystem Functions

    • Regulates biological energy flow
    • Controls nutrient cycling
    • Influences biological regulation

    Types of Ecosystem

    • Terrestrial (forests, grasslands, deserts, tundra)
    • Aquatic (freshwater, marine)

    Freshwater Ecosystem

    • Lentic: standing water (lakes, ponds, bogs)
    • Lotic: flowing water (rivers, streams)

    Marine Ecosystem

    • Oceans, seas, estuaries, coral reefs, coastal regions
    • Coral reefs are formed from skeletons of marine organisms.

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