Photosynthesis

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Across
  1. 2. _____ layer, a tissue inside a leaf that contains many air spaces
  2. 5. something that can be changed in an investigation
  3. 7. _____ variable, something that is kept the same in an investigation so that the test is fair
  4. 8. material made from living cells and tissues
  5. 10. a green substance found in some of the cells in plant leaves, which absorbs energy from light
Down
  1. 1. a layer of cells covering a plant organ, such as a leaf or root
  2. 3. _____ layer, a tissue inside a leaf in which photosynthesis takes place
  3. 4. _____ organism means organism that needs oxygen
  4. 6. tubes made of dead, empty cells, that transport water upwards from the roots of a plant
  5. 9. a tiny hole in the surface of a leaf, through which gases can diffuse