ASE's PLAN Matrices
These give very useful exemplification of what secure attainment looks like for different National Curriculum science topics.
The Primary Science Teaching Trust TAPs project provides some assessment activities with descriptors for working towards, expected and greater depth outcomes.
Assessment for Learning Activities
A comprehensive powerpoint that gives simple descriptions of many assessment techniques by Mike Gershon.
2017-2018 Teacher assessment at the end of KS1 Here
2017-2018 Teacher assessment at the end of KS2 Here.
Exemplification (2016) KS1 Here
Exemplification (2016) KS2 Here
NfER Review of Assessment for Learning in Primary Science.
SOLO Taxonomy assessment grids