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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
MAPPING and TRANFERANCE and then SOME
In UbD, authentic assessment would be a series of tasks to demonstrate mastery with hopefully some basis outside the classroom environment.
Hopefully there is some component about a direct application to the exact lesson (direct synthesis), but more importantly is to assess their understanding in TRANSFERING and MAPPING the skills, knowledge and competencies to something they can relate to.
WRT to scale, I would hope the students could demonstrate direct scaling with the objects measured on the walk-around. I would hope the students get to the point, over a series of scaling classes, to start asking questions outside of what was presented. How many of these object fit along the length of your pen length?
Authentic assessment must change over time (progress with the topic), but it will also change (process). Oh yeah, hopefullly there is product.