Study

Ecosystems

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  • What is the main source of toxins entering ecosystems?
    Natural geological processes
    Atmospheric pollution
    Biological interactions among organisms
    Chemicals used in industry and agriculture
  • What is the main purpose of a food chain in an ecosystem?
    To determine the population size of organisms
    To show where living things get their food
    To predict the weather patterns
    To analyze geographical features
  • Where does all the energy in an ecosystem originate from?
    The Moon
    The Sun
    Plants
    Animals
  • What can happen when new plants or animals arrive in an ecosystem?
    They have no impact on native species
    They lead to cooperation among native species
    They lead to competition for resources among native species
    They always benefit native species
  • How do toxins affect living organisms in ecosystems?
    They can harm or kill living things
    They provide essential nutrients for growth
    They enhance reproductive success
    They have no impact on organisms
  • What is the role of primary consumers in an ecosystem?
    To consume producers
    To produce energy through photosynthesis
    To produce energy through photosynthesis
    To release minerals into the soil
  • Why do we use a food web instead of a food chain in ecosystems?
    To show only one set of feeding relationships
    To simplify the ecosystem
    To focus on a single organism
    To understand all the feeding relationships
  • Which of the following is true about the components of an ecosystem?
    Nonliving things are not essential for ecosystem balance
    Changes to one component can affect others
    Living and nonliving things are completely separate
    Living things have no impact on nonliving things
  • How does energy move through ecosystems?
    It is produced by photosynthesis
    It is transferred through food chains and webs
    It is created by secondary consumers
    It is generated by decomposers
  • Why are primary consumers essential in a food chain?
    Because they are producers
    Because they are predators
    Because they eat several types of plants
    Because they eat only meat
  • What are toxins?
    Harmful chemicals used in agriculture
    Nutrients essential for plant growth
    Poisonous substances that can harm or kill living things
    Beneficial substances for ecosystems
  • How do changes in an ecosystem due to human activities impact wildlife?
    They provide more habitats for wildlife
    They always benefit wildlife
    They have no impact on wildlife
    They can lead to loss of habitats and food sources
  • Why is the woodpecker in the North American food web considered an omnivore?
    Because it only eats animals
    Because it only eats plants
    Because it eats both plants and animals
    Because it is a predator
  • Why is energy transfer not 100% efficient in ecosystems?
    Energy is lost as heat and used for growth and reproduction
    Energy is stored in the soil
    Because of the presence of decomposers
    Due to the lack of sunlight
  • What can be a consequence of natural disasters in an ecosystem?
    Destruction of habitats and loss of species
    Enhanced resources for surviving species
    Increased biodiversity
    No impact on species population
  • When a secondary consumer eats a primary consumer, what happens to the energy?
    It is stored in the secondary consumer
    Only a small part is transferred again
    It is transferred to the Sun
    It is converted into minerals
  • What is the long-term impact of toxins on ecosystems?
    Harm to ecosystem health and inhabitants
    Improved ecological balance
    Stabilization of food webs
    Enhanced biodiversity
  • Why are grasses considered producers in a food chain?
    Because they are carnivores
    Because they make their own food
    Because they eat other organisms
    Because they are secondary consumers
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