Sci reviewer

• Species


  A distinct group of organisms of the same kind
• Ecosystems


  • Forests, wetland, and freshwater ecosystems populated by different kinds of species shows high species diversity
• Domain

  The largest category in classifying organisms
• Carolus Linnaeus


  The Father of Modern Taxonomy who first named plants and other living organisms
• Linnaean Hierarchical System of Classification

  domain-kingdom-phylum-class-order-family genus species
• Practices that help conserve the environment


  • Adopting organic farming
  • Using insects to fight other insects
  • Growing variety of crops rather than just one crop
• Birds eat insect pests and small rodents


  These pests are themselves destroyers of valuable crops
• Benefits of recycling waste material

  • Reduces volume of wastes
  • Turns damaged materials into useful ones
  • Derives income from solid waste
• Omnivores


  Eat both plants and animals
• Feeding relationships in a food chain

  1. Grasses

  2. Grasshoppers

  3. Frogs

  4. Snakes

  5. Eagle
• Highest trophic level in an energy pyramid has the least amount of energy
• Animals release carbon dioxide


  Plants need carbon dioxide to survive
• Role of animals in oxygen-carbon dioxide cycle


  They give off carbon dioxide for photosynthesis
• Role of nitrogen-fixing bacteria


  Converts nitrogen gas into ammonia
• Role of bacteria


  Break down dead organic matter
• Role of plants in oxygen-carbon dioxide cycle


  They absorb carbon dioxide and release oxygen during photosynthesis
• Role of free-living bacteria on the soil

  Convert nitrogen into usable form
• 10% of water absorbed by plants is released back to the environment through transpiration
• Oxygen-Carbon dioxide cycle


  1. Respiration

  2. Photosynthesis
• Nitrogen cycle


  Where nitrogen is created and recycled
• Water cycle


  1. Evaporation

  2. Water vapor
• Importance of sunlight to water cycle

  It changes the state of water from liquid to gas
• Monoculture


  When farmers plant a single highly productive crop year after year
• Widespread use of pesticides


  Causes the greatest decrease in the biodiversity of a large ecosystem
• Recycling plastic waste


  The best way to dispose of plastic wastes
• Ways to conserve resources


  • Reducing
  • Recycling
  • Reusing
• Conservation


  Preservation and wise use of natural resources
• Humans cut down trees from forests to build houses


  Habitat of plants and animals changes and pollution increases