Science Crossword

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Across
  1. 2. The supporting and water-conducting tissue
  2. 4. Type of plant dependant on another for nutrition
  3. 5. Relation between two interdependent organisms
  4. 7. A leafless annual parasitic vine
Down
  1. 1. Green pigment occurring in plants
  2. 3. An organism capable of making its own food
  3. 6. Minute pores in leaves that let gas and vapor pass