PHOTOSYNTHESIS ESSENTIALS

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Across
  1. 2. An experiment or procedure, such as the iodine test for starch, used to prove that a factor (like CO₂ or chlorophyll) is necessary for photosynthesis.
  2. 4. To capture and hold; chlorophyll traps light energy from the sun, which is then converted into chemical energy during photosynthesis.
  3. 8. Refers to (CO₂), the gas absorbed by plants from the air, which provides the carbon needed to make food.
  4. 9. A complex carbohydrate (sugar) that plants produce and store as a food reserve; it is tested for using iodine solution to indicate photosynthesis occurred.
  5. 10. The green pigment found in chloroplasts of plant cells that absorbs light energy, making photosynthesis possible.
  6. 11. A chemical element (C) that is a fundamental building block of life and a key component of the reactant carbon dioxide in photosynthesis.
  7. 12. A chemical solution used to test for the presence of starch; it turns from brown to blue-black if starch is present.
  8. 13. The source of energy for photosynthesis; required for the reaction to proceed and is absorbed by chlorophyll.
  9. 15. To take in; chlorophyll absorbs light energy, and leaves absorb carbon dioxide from the air through their stomata.
Down
  1. 1. The process of placing a plant in the dark for 24-48 hours to use up its stored starch, ensuring any starch later found is from a new, controlled experiment.
  2. 3. The process by which green plants use light energy to convert carbon dioxide and water into glucose and oxygen.
  3. 5. The state of not having something; testing what happens in the absence of CO₂ or chlorophyll proves they are requirements.
  4. 6. A factor that can be changed, kept the same, or measured in an experiment. In these investigations, the presence of CO₂ or chlorophyll is the variable tested.
  5. 7. The part of an experiment set up for comparison, where the variable being tested (e.g., CO₂) is present, to show what normally happens.
  6. 14. The simple sugar (C₆H₁₂O₆) produced during photosynthesis; it is the plant's initial food product, which can be converted into starch for storage.