Sources of Food - Part 1

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Across
  1. 2. A substance added to soil to increase its nutrients
  2. 3. Gas needed for photosynthesis
  3. 5. The soil contains these for healthy growth of the plants
  4. 7. Gas produced during photosynthesis
  5. 9. A solution that turns Universal Indicator red
  6. 11. Green pigment found in leaves
  7. 13. Excess chemical fertilisers can contaminate this
  8. 15. The rapid growth of algae
Down
  1. 1. Chemical fertilisers are rich in this element
  2. 4. Amount of crops produced
  3. 6. Excess sugar is converted to this for storage in plants
  4. 8. Process whereby plants make food
  5. 10. Decomposed plant material
  6. 12. A solution that has pH 7
  7. 14. Litmus paper turns blue in this condition