Daphnia Lab: Day 2

On Tuesday & Wednesday (5/23 & 5/24), students began the process of designing their experiments and collecting data.

At this point, students should have:

• developed an experiment question
• hypothesis
• materials list
• procedure
• data table

After that, students began gathering data about daphnia heart rate for their control. In general, students counted daphnia heart rate for 10 second intervals and multiplied by 6 to get the beats per minute. Students are expected to gather their own data for multiple trials, count their own heart rates, and write their own lab report.

If students were ready, they began collected experiment data, exposing the daphnia to environmental changes. Students added chemicals to their daphnia on the slides or exposed them to other changes such as light or sound. Students need to expose their daphnia to different levels, so if they chose a chemical they exposed their daphnia to a 1% solution, 5% solutions and 10% solution and collected trials from each.

Students should be working on question 2 in their lab packet, which is background knowledge about their variable, and bring that information to the next class. We will be spending the next 2 class periods finishing data collection and writing the lab report.