ecology

• What should you be able to describe by the end of the video?

  Levels of organization in an ecosystem
• What does competition in an ecosystem refer to?

  Organisms competing for limited resources
• What is meant by interdependence in an ecosystem?

  Species relying on each other for survival
• What is the definition of a habitat?

  The environment where an organism lives
• What is the habitat of elephants mentioned in the video?

  The grasslands of Africa
• What is a population in ecological terms?

  Total number of same species in an area
• What is a community in an ecosystem?

  Populations of different species in a habitat
• What does the term biotic refer to?

  Living parts of the environment
• What does the term abiotic refer to?

  Nonliving parts of the environment
• What is an ecosystem composed of?

  Both biotic and abiotic parts of an environment
• Why do living organisms require materials from their surroundings?

  To survive and grow
• What resources do plants compete for?

  Light, space, water, and minerals
• What resources do animals compete for?

  Food, water, mating partners, and territory
• What is interdependence in a community?

  Species relying on each other for resources
• How do lions depend on other organisms?

  Lions eat animals like zebras and gazelles
• How do zebras and gazelles obtain their food?

  By eating grass and shrubs
• What role do some living organisms play in providing shelter?

  They protect animals from the Sun
• How do plants depend on animals?

  For pollination and seed dispersal
• What happens if a species disappears from a community?

  It can affect the entire community
• What is a stable community?

  Populations of species remain fairly constant
• What abiotic resource is mentioned as an example?

  Water
• What does it mean for populations to be in balance?

  They coexist with each other and resources
• Where can you find questions on competition and interdependence?

  In the vision workbook
• What should you be able to do by the end of this video?

  Use food chains to represent feeding relationships
• How do the numbers of predators and prey change over time?

  They change in cycles
• What biotic factor affects organisms mentioned in the video?

  Source of food
• What is a simple food chain example given in the video?

  Grass, rabbits, foxes
• What is the role of producers in food chains?

  They synthesize complex molecules
• What do scientists call the molecules produced by green plants?

  Biomass
• What is the primary consumer in the first food chain?

  Rabbit
• What is the primary consumer in the second food chain?

  Caterpillar
• What is a secondary consumer?

  An animal that eats a primary consumer
• In the food chain with four stages, what is the tertiary consumer?

  Bird of prey
• What are predators?

  Consumers that kill and eat other animals
• In the first food chain, what is the prey?

  Rabbit
• In the second food chain, what is the prey?

  Caterpillar
• What does the graph of predator and prey populations show?

  They rise and fall in cycles
• What might cause changes in predator-prey cycles?

  A drought or a new predator
• What are the key components of a food chain?

  • Producers (e.g., green plants)
  • Primary consumers (e.g., rabbits, caterpillars)
  • Secondary consumers (e.g., small birds)
  • Tertiary consumers (e.g., birds of prey)
  • Predators and prey relationships
• What technique do scientists use to determine species abundance and distribution?

  Sampling