1 / 6

Why Do Leaves Change Color?

Why Do Leaves Change Color?. Extracting Pigments From Chloroplasts. Materials. Leaf Small clear paper cup Alcohol to fill cup approx. ½ full Paper towel Coffee filter Plastic fork or knife. Procedure. Flatten filter and place it on paper towel.

Audrey
Télécharger la présentation

Why Do Leaves Change Color?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Why Do Leaves Change Color? Extracting Pigments From Chloroplasts

  2. Materials • Leaf • Small clear paper cup • Alcohol to fill cup approx. ½ full • Paper towel • Coffee filter • Plastic fork or knife

  3. Procedure • Flatten filter and place it on paper towel. • Using the blunt side of the knife or the fork handle, gently rub the leaf against the edge of the filter. Green chlorophyll will begin to appear on the filter. Continue until you have a good amount of green. • Cut from sides of green to middle of filter. • Place cut strip into alcohol-filled cup.

  4. Procedure (cont.) • Allow the filter/chlorophyll to set in the alcohol for at least one hour. • Remove from the alcohol and observe what happened.

  5. Results • The chlorophyll should have quickly turned the alcohol green. • After approx. 30 minutes, hidden pigments should have begun to appear. • You might see red, brown, or yellow. Colors vary, depending upon which pigments are in the particular left you are working with.

  6. Why Does This Happen? • The green chloroplasts mask the other pigments. They are always there. We just can’t see them until cool weather approaches and photosynthesis decreases. Without food production, the green disappears and the masked pigments appear. Eventually the leaf falls.

More Related