A green leaf. Image credit wallconvert.com

A green leaf. Image credit wallconvert.com

ZIMSEC O Level Combined Science: Chlorophyll and Photosynthesis

Aim: To test whether chlorophyll is necessary for photosynthesis.

Materials

Two plants with variegated leaves i.e. leaves that are partly green, permanent marker  and equipment for the start test.

A variegated leaf. Image credit mendocinomaples.com

A variegated leaf. Image credit mendocinomaples.com

Method

  1. Draw on one of the leaves tracing out the green parts and separating them from the non-green parts.
  2. Place the plant in the light for a few hours.
  3. Test the leaf for starch.
  4. Record the results.

Results

Image credit slideshare.net

Image credit slideshare.net

  • The parts without chlorophyll tests negative for photosynthesis.
  • The parts chlorophyll tests positive for photosynthesis.

Explanation

  • Chlorophyll is required for photosynthesis.

To access more topics go to the Combined Science Notes page.


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