BIOLOGY

NUTRITION

ACTIVITIES

Introduction
Mechanism of photosynthesis
Adaptation of a leaf to photosynthesis
Students' Experiments

Exercise

References
Glossary

 

Experiment 1. Testing for Starch
Experiment 2. Showing that carbon dioxide is necessary for photosynthesis.
Experiment 3. Showing that light is necessary for photosynthesis.
Experiment 4. Showing that chlorophyll is necessary for photosynthesis.
Experiment 5. Showing that oxygen is given off during photosynthesis.

 

EXPERIMENT IV: SHOWING THAT CHLOROPHYLL IS NECESSARY FOR PHOTOSYNTHESIS

Aim:

To show that chlorophyll is necessary for photosynthesis.

Apparatus and Materials

Plant that has variegated leaves, ethanol, beaker, boiling tube, water, heat source, Iodine solution.

Method / procedure:

- Leave the plant with variegated leaves in light for 2-6 hours.

- Remove one leaf and make a labelled diagram to show the green and non-green parts.

- Test the leaf for starch.

Conclusion:

Starch is made only in areas of the leaf with chlorophyll, showing that chlorophyll is necessary for photosynthesis.

Teachers' guide
Scheme of work
Lesson plan