Organisms and Their Environment
48 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary cause of the enhanced greenhouse effect?

  • Solar radiation changes
  • Human activities increasing greenhouse gas concentrations (correct)
  • Volcanic eruptions releasing carbon dioxide
  • Natural fluctuations in the Earth's temperature

    • What happens to corals when they experience stress due to environmental changes?

  • They become more colorful
  • They migrate to colder waters
  • They expel the algae and undergo bleaching (correct)
  • They produce more algae

    • Which of the following is a consequence of rising atmospheric temperatures?

  • Increased biodiversity in aquatic ecosystems
  • Improved coral health
  • More breeding grounds for mosquitoes (correct)
  • Decreased sea levels

    • How does high atmospheric carbon dioxide affect aquatic ecosystems?

    <p>It contributes to shellfish shell weakening</p> Signup and view all the answers

    What is the primary purpose of the Wolbachia-Aedes suppression technology used in Singapore?

    <p>To reduce the population of dengue-spreading mosquitoes</p> Signup and view all the answers

    What is coral bleaching and its impact on biodiversity?

    <p>Coral expelling algae, leading to loss of support for species</p> Signup and view all the answers

    What is a potential consequence of the loss of forested land for certain animal populations?

    <p>Endangerment or extinction</p> Signup and view all the answers

    What distinguishes global warming from climate change?

    <p>Global warming is specifically about rising temperatures, while climate change includes broader changes</p> Signup and view all the answers

    What happens to carbon dioxide during photosynthesis in growing trees?

    <p>It is stored in tree biomass</p> Signup and view all the answers

    What might be a result of melting ice sheets in Greenland and Antarctica?

    <p>Rising sea levels leading to flooding in some countries</p> Signup and view all the answers

    Why is maintaining a large gene pool important in conservation?

    <p>It allows for the cross-breeding of different varieties to enhance agricultural produce.</p> Signup and view all the answers

    Which of the following statements is true regarding the significance of tropical plants?

    <p>They are sources of critical medicinal drugs.</p> Signup and view all the answers

    How does deforestation contribute to soil erosion?

    <p>By removing the protective leafy canopy</p> Signup and view all the answers

    What effect does deforestation have on the water cycle?

    <p>It decreases annual rainfall</p> Signup and view all the answers

    What is one economic reason for conservation?

    <p>Marine and tropical life are essential sources of food.</p> Signup and view all the answers

    Which of the following gases is primarily responsible for the greenhouse effect?

    <p>Carbon dioxide</p> Signup and view all the answers

    How does conservation help in maintaining a balanced ecosystem?

    <p>By preventing disruptions in natural cycles like the carbon cycle.</p> Signup and view all the answers

    What happens when trees are cut down and left to rot?

    <p>Carbon dioxide is released</p> Signup and view all the answers

    What role does scientific research play in conservation efforts?

    <p>It helps understand wildlife evolution and species interactions.</p> Signup and view all the answers

    Which of the following is NOT a reason for conservation?

    <p>To exploit resources without restrictions.</p> Signup and view all the answers

    What is one result of desertification caused by deforestation?

    <p>Barren land unable to support plants</p> Signup and view all the answers

    Which of the following human activities does NOT contribute to increased carbon dioxide levels?

    <p>Planting trees</p> Signup and view all the answers

    Why is it crucial to prevent the extinction of species from an ecological perspective?

    <p>To ensure that genetic diversity remains intact.</p> Signup and view all the answers

    What lifestyle changes can be implemented to help conserve resources sustainably?

    <p>Promoting recycling and sustainable practices.</p> Signup and view all the answers

    What type of consumers only feed on plants?

    <p>Primary Consumers</p> Signup and view all the answers

    Which group of organisms breaks down dead matter and returns nutrients to the environment?

    <p>Decomposers</p> Signup and view all the answers

    What percentage of carbon dioxide released by human activities is absorbed by oceans?

    <p>33%</p> Signup and view all the answers

    What is the starting point of a food chain?

    <p>Producer</p> Signup and view all the answers

    Which process drives the oceans' role as carbon sinks?

    <p>Solubility and photosynthesis</p> Signup and view all the answers

    How do secondary consumers obtain their energy?

    <p>By feeding on primary consumers</p> Signup and view all the answers

    What is formed from the remains of trees after millions of years?

    <p>Coal</p> Signup and view all the answers

    What characterizes the flow of energy in an ecosystem?

    <p>Non-cyclical and linear</p> Signup and view all the answers

    How much of Canada's forests are harvested in any given year?

    <p>0.5%</p> Signup and view all the answers

    What is a food web?

    <p>A collection of interconnected food chains</p> Signup and view all the answers

    Which of the following statements is true regarding nutrients in the ecosystem?

    <p>Decomposers are responsible for nutrient recycling.</p> Signup and view all the answers

    What is the primary goal of the Paris Agreement?

    <p>Limit the rise in global temperature to below 2 °C</p> Signup and view all the answers

    Which regions' forests have been studied to understand carbon absorption rates?

    <p>Asia, Africa, South America</p> Signup and view all the answers

    Which of the following is NOT a characteristic of decomposers?

    <p>They transform energy into chemical energy for other organisms.</p> Signup and view all the answers

    By what year should global carbon emissions reach net-zero according to climate goals?

    <p>2050</p> Signup and view all the answers

    Which statement is true regarding the Paris Agreement?

    <p>It was negotiated by 196 parties in 2015.</p> Signup and view all the answers

    What generally occurs when the number of predators decreases?

    <p>The number of prey increases.</p> Signup and view all the answers

    What does a pyramid of numbers represent?

    <p>The number of organisms at each trophic level.</p> Signup and view all the answers

    How is a pyramid of numbers constructed based on the given food chain?

    <p>By evaluating the number of organisms at each trophic level.</p> Signup and view all the answers

    What is a limitation of using a pyramid of numbers?

    <p>It does not differentiate between juvenile and adult organisms.</p> Signup and view all the answers

    Which of the following represents the correct placement of trophic levels in ecological pyramids?

    <p>Producers at the bottom, primary consumers in the middle, tertiary consumers at the top.</p> Signup and view all the answers

    What do pyramids of biomass allow us to compare?

    <p>The mass of organisms at each trophic level.</p> Signup and view all the answers

    In the context of predator-prey relationships, which statement is true?

    <p>Population changes in predators correspond to those in prey.</p> Signup and view all the answers

    What can be inferred about the population size of producers compared to that of primary consumers?

    <p>There are typically more producers than primary consumers.</p> Signup and view all the answers

    Study Notes

    Organisms and Their Environment

    • Ants are a common sight, but their significance is substantial. A world without ants would have fewer insect infestations and a reduced use of insecticides.
    • Ants play critical roles in the environment
    • Removing ants would affect other organisms and potentially human lives, potentially increasing risk of starvation.
    • Ecosystems are comprised of producers, consumers, and decomposers.
    • Producers such as plants and algae make their own food via photosynthesis.
    • Consumers eat other organisms for energy. They are categorized as primary, secondary, or tertiary based on their feeding level.
    • Decomposers break down dead organisms, returning nutrients to the environment.
    • Energy flows through an ecosystem through feeding relationships, but is not cyclical.
    • Energy is lost at each trophic level, meaning less energy is available for organisms as the food chain goes from bottom to top.
    • A shorter food chain is more energy efficient because less energy is lost.
    • A food web is a network of interconnected food chains.
    • A population is a group of the same species living in a habitat.
    • A community is the total of all populations of different species living and interacting in a habitat.
    • An ecosystem is a community of organisms interacting with the non-living environment.
    • Food chains show the energy and nutrient transfer from a producer through consumers, and end with a decomposer.
    • Trophic levels are the positions occupied by organisms in a food chain, generally no more than 4 levels.
    • Pyramids of numbers show the number of organisms at each trophic level.
    • Pyramids of biomass show the mass of organisms at each trophic level. A biomass pyramid can be inverted.
    • Energy is not recycled in the ecosystem, it is transferred.
    • The sun is the main energy source for all biological systems.
    • Photosynthesis converts carbon dioxide and water into glucose (food) which plants use, and oxygen is released in the process.

    Nutrient Recycling

    • A carbon cycle is a process where carbon is constantly being released and removed from the environment in the form of carbon dioxide.
    • Photosynthesis removes carbon dioxide from the atmosphere, while respiration returns it.
    • Decomposition returns carbon dioxide to the atmosphere.
    • Fossil fuels release carbon dioxide when burned.
    • Oceans are a significant carbon sink that absorb a higher amount of carbon dioxide from the atmosphere than they release.
    • Forests are also carbon sinks, storing carbon in trees.

    Human Impacts

    • Human activities are a significant factor disrupting the natural cycles of the ecosystem, and upsetting the balance.
    • Deforestation affects the carbon cycle by depleting the number of trees which would sequester carbon dioxide from the atmosphere.
    • Burning fossil fuels releases carbon dioxide into the atmosphere.
    • Pollution, such as sewage, can cause eutrophication in aquatic ecosystems and the depletion of dissolved oxygen.
    • Insecticides can accumulate in living organisms, biomagnifying in the food chain.
    • Deforestation contributes to global warming.

    Conservation

    • Biodiversity is important because of the many different species contained in a given ecosystem, and are vital for maintaining a healthy ecosystem.
    • Conservation is needed to protect and preserve natural resources in the environment.
    • Maintaining biodiversity is important for maintaining the balance of ecosystems, human uses of natural resources (e.g., food, materials, medicine).
    • Some countries have programmes (e.g., mangrove restoration projects, reforestation efforts) to conserve their resources.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Biology Matters GCE O Level Textbook - Organisms and Their Environment PDF

    Description

    Explore the vital roles that organisms, particularly ants, play in their ecosystems. Understand the relationships among producers, consumers, and decomposers, and learn how energy flows through these systems. This quiz delves into the importance of biodiversity and the implications of removing certain species.

    More Like This

    Ecosystem Dynamics Quiz
    5 questions

    Ecosystem Dynamics Quiz

    SmarterSmokyQuartz avatar
    SmarterSmokyQuartz
    Marine Ecosystem Energy Transfer Quiz
    25 questions

    Marine Ecosystem Energy Transfer Quiz

    ResplendentBlackTourmaline avatar
    ResplendentBlackTourmaline
    Understanding Food Chains in Forest Ecosystems
    10 questions

    Understanding Food Chains in Forest Ecosystems

    GainfulCopernicium avatar
    GainfulCopernicium
    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser