Underline the correct form to complete the sentences.

  1. In many leaves, as fast as sugar is produced / produces it is turned into starch.
  2. Carbon and oxygen can be supplied / can supply by carbon dioxide (CO2) from the air.
  3. Does carbon dioxide need / Is carbon dioxide needed for photosynthesis?
  4. As the light intensity increases / is increased, the rate of photosynthesis increases.
  5. Carbon dioxide, water, and light are needed / need for starch production in a leaf.
  6. The glucose molecules produced by photosynthesis are quickly built up / quickly build up into starch molecules.

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