I came across this pollination activity from this kindergarten blog and loved it. This is a perfect example of an activity that can be done and recorded in a science notebook for younger grade levels (although to be honest older grades would like this activity as well as it involves eating cheetos :)
Basically the kids go from bag to bag eating from the "flower" (bag of cheetos). They can not lick or wipe their fingers (the cheese dust represents the pollen). Afterward they have go visit the flowers of their friends "landing" on it with their fingers. Afterward they have to fill out a sheet noting what they learned (if I was notebooking in this grade level this would represent the "right hand sheet" students would complete.
In our district this activity is better suited for the first grade standards so I passed it on to all those teachers. One teacher emailed me back and said that she rushed out to get cheetos to do with her kids :)