CAROLINA LABSHEETS
The simple exercises that students perform in this lab demonstrate that plants produce glucose through photosynthesis, that plants convert at least some of the glucose to starch, and that sunlight is a critical factor in photosynthesis.
Students expose Coleus leaves to varying amounts of light. These sample leaves are then subjected to an iodine test. Students record and analyze the results.
Ensure that students understand and adhere to safe laboratory practices when performing any activity in the classroom or lab. Demonstrate the protocol for correctly using the instruments and materials necessary to complete the activities, and emphasize the importance of proper usage. Use personal protective equipment such as safety glasses or goggles, gloves, and aprons when appropriate. Model proper laboratory safety practices for your students and require them to adhere to all laboratory safety rules. This activity requires students to heat ethanol, which is highly flammable. Do not heat with a flame of any type. Use only a hot plate, and keep a fire extinguisher nearby.
A white variegated, vigorous clone. Especially good for starch-iodine reaction to show absence of photosynthesis in non-green areas. This plant is very easy to propagate from stem cuttings.
Students can work individually or in groups of two to four. If the students work in groups, they can share equipment and duties. For efficiency, one student might perform the tests in this lab, while another observes and records findings. They can change roles for some activities.
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