atmosphere and photosynthesis dictation

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Across
  1. 2. ___ supports burning and is the by-product of photosynthesis..
  2. 5. ___ removes and dissolves chlorophyll in iodine test.
  3. 6. ___ is the product of photosynthesis.
  4. 8. ___splint relights in oxygen.
  5. 11. Air contains 78% of ______.
  6. 12. Earth is surrounded by a layer of air called the ______.
Down
  1. 1. ___ indicator turns from red to yellow when the percentage of carbon dioxide is higher than 0.04%.
  2. 3. ___ is a green pigment which absorbs sunlight.
  3. 4. ___ is a process in which plants make their own food.
  4. 7. Boiling destroys the cell ___ for iodine test.
  5. 9. ___ is stored in green leaf cells for later use and can be tested by iodine solution.
  6. 10. ___ water is used for testing the presence of carbon dioxide.