Flip flap books are amazing! They are a worksheet, but it feels like if they are doing a fun activity. Students have to glue each part of the plant and draw a whole plant on the other side, making sure that each part of their drawing matches with the part they glued.
The middle line is to fold it in half, and the dotted lines are the ones you need to cut.

You can complement this activity with this PPT.
I did this activity with my friend Carmen Ortúzar.