Organisms and Their Environment

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

What happens to carbon dioxide during photosynthesis in growing trees?

<p>It is stored in tree biomass (C)</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 (B)</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. (A)</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. (C)</p> Signup and view all the answers

How does deforestation contribute to soil erosion?

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

What effect does deforestation have on the water cycle?

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

What is one economic reason for conservation?

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

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

<p>Carbon dioxide (B)</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. (D)</p> Signup and view all the answers

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

<p>Carbon dioxide is released (C)</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. (A)</p> Signup and view all the answers

Which of the following is NOT a reason for conservation?

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

What is one result of desertification caused by deforestation?

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

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

<p>Planting trees (A)</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. (C)</p> Signup and view all the answers

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

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

What type of consumers only feed on plants?

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

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

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

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

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

What is the starting point of a food chain?

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

Which process drives the oceans' role as carbon sinks?

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

How do secondary consumers obtain their energy?

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

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

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

What characterizes the flow of energy in an ecosystem?

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

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

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

What is a food web?

<p>A collection of interconnected food chains (C)</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. (D)</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 (A)</p> Signup and view all the answers

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

<p>Asia, Africa, South America (A)</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. (A)</p> Signup and view all the answers

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

<p>2050 (B)</p> Signup and view all the answers

Which statement is true regarding the Paris Agreement?

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

What generally occurs when the number of predators decreases?

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

What does a pyramid of numbers represent?

<p>The number of organisms at each trophic level. (B)</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. (D)</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. (B)</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. (C)</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. (C)</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. (D)</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. (D)</p> Signup and view all the answers

Flashcards

Primary Consumer

An organism that only eats plants.

Secondary Consumer

An organism that feeds on primary consumers.

Tertiary Consumer

An organism that feeds on secondary consumers.

Decomposer

Organism that breaks down dead things for nutrients.

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Food Chain

Series of organisms where energy passes from one to another.

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Food Web

Interconnected food chains in an ecosystem.

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Non-cyclical Energy Flow

Energy flows in one direction in an ecosystem, not in cycle.

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Ecosystem

Community of living organisms interacting with the non-living environment.

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Predator-Prey Relationship

A cycle where predator populations affect prey populations, and vice-versa.

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Pyramid of Numbers

A diagram showing the number of organisms in each trophic level of a food chain.

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Trophic Levels

Different feeding levels in a food chain.

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Pyramid of Biomass

A diagram that compares the total mass of organisms at each trophic level.

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Pyramid Construction (Numbers)

A pyramid of numbers represents the count of each organism in a food chain.

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Limitations of Pyramids of Numbers

Pyramids of numbers do not consider organism size or if they are juveniles or adults.

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Ecological Pyramid

A visual representation of trophic levels in a food chain, showing energy flow between them.

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Food chain relationship

The flow of energy that is transfered between organisms.

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Ocean Carbon Sink

Oceans absorb CO2 from the atmosphere through solubility and photosynthesis by aquatic plants.

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Forest Carbon Sink

Forests absorb CO2 through photosynthesis and store carbon in trees.

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Carbon Sink

A natural environment that absorbs CO2 from the atmosphere, storing it.

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Photosynthesis

Plants use CO2 to create energy and store carbon.

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Fossil fuel formation

Carbon compounds buried deep underground, become coal, oil, or natural gas.

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Paris Agreement

International treaty to limit global warming.

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Deforestation

Clearing of forests.

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Climate Change Mitigation

Actions to reduce greenhouse gas emissions.

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Greenhouse Effect

A natural process where certain gases in the atmosphere trap heat from the sun, warming the Earth.

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Global Warming

The gradual increase in Earth's average temperature caused by human activities.

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Climate Change

Long-term shifts in weather patterns and temperatures, often caused by global warming.

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Coral Bleaching

When corals expel the algae that live in their tissues, turning white and losing their ability to support as many species.

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Biodiversity Loss

The decline in the variety of species and ecosystems in a particular area.

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Wolbachia-Aedes Suppression Technology

A method to control dengue outbreaks by introducing Wolbachia bacteria into male Aedes mosquitoes, which prevents egg hatching.

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Ocean Acidification

The process of the ocean becoming more acidic due to the absorption of carbon dioxide from the atmosphere.

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Shellfish Thinning

The weakening of shellfish shells due to ocean acidification, making them more vulnerable.

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Deforestation and CO2

Cutting down trees reduces photosynthesis, leading to higher atmospheric CO2 levels. This contributes to global warming.

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How does deforestation cause flooding?

Erosion due to deforestation deposits soil in rivers and streams, blocking water flow and causing floods.

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What is Desertification?

Loss of vegetation and fertile soil due to deforestation, causing land to become barren and unsuitable for plant growth.

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Fossil Fuel Combustion

Burning fossil fuels like coal and gas releases large amounts of CO2 into the atmosphere, contributing to global warming.

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Plastic Waste Combustion

Burning plastic waste releases greenhouse gases, including CO2, into the atmosphere, worsening global warming.

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How do Greenhouse Gases Work?

Greenhouse gases absorb energy from the sun, trapping heat in the atmosphere and causing the planet to warm.

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Carbon Dioxide Pollution

Excessive levels of CO2 in the atmosphere, caused by human activities like deforestation and burning fossil fuels, contribute to global warming.

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Conservation

Protecting and preserving natural resources, like forests and wildlife, for the benefit of present and future generations.

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Biodiversity

The variety of life in an ecosystem, encompassing different species, their genes, and the habitats they live in.

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Genetic Diversity

The range of different genes within a population of organisms.

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Sustainable Management

Using resources wisely to meet present needs without compromising future generations' ability to use them.

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Why Conserve?

Reasons for conservation include: maintaining biodiversity, scientific research, economic benefits, ecosystem stability, and preserving natural beauty.

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Medicinal Plants

Plants used for creating medicines, showcasing the importance of biodiversity for human health.

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Impact of Conservation

Conservation measures and lifestyle changes are crucial to preserve balanced ecosystems and combat climate change.

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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.

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