Topic 1 Living Things in the Biosphere

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Across
  1. 2. The basic unit of all life.
  2. 3. A structure in the body that is made of different kinds of tissues and performs a specific job.
  3. 5. Any individual living thing.
  4. 6. The main body of a plant that supports the leaves and flowers.
  5. 8. Wall: The rigid layer outside the cell membrane in plant cells and some other organisms.
  6. 11. Organisms that cannot make their own food and must eat other organisms.
  7. 12. A large sac in a plant cell that stores water and other substances.
  8. 13. A group of organisms that are physically similar and can reproduce with each other.
  9. 14. An organism that a parasite or virus lives in or on.
  10. 16. Eukaryotic organisms that cannot be classified as an animal, plant, or fungus.
  11. 17. The part of a plant that anchors it in the ground and absorbs water and nutrients.
  12. 18. Animals with a backbone.
  13. 19. Single-celled organisms that are prokaryotes (have no nucleus).
  14. 20. Organisms that make their own food, like plants.
Down
  1. 1. An organelle in plant cells where photosynthesis takes place.
  2. 4. Animals without a backbone.
  3. 7. A tiny, nonliving particle that invades and then reproduces inside a host cell.
  4. 9. The primary part of a plant that performs photosynthesis.
  5. 10. Organisms like mushrooms, molds, and yeasts that are heterotrophs with cell walls.
  6. 15. Generation: The mistaken idea that living things can arise from nonliving sources.