Standards:
PA Standards: Science, Technology and Engineering Education (Elementary) (pdf)

Curriculum:
K-4 Science Curriculum Outline.pdf (no date)
Grade 2 Science Curriculum.pdf (last updated in 2007 by EASD)

Resources for Students: 

Plants:
Parts of the Plant (smartboard activity) 

Animals:
Animal Groups (smartboard activity)
Butterfly vs. Moth (video) 
Insect Camouflage (smartboard activity)
Build a Food Chain (smartboard activity)

Animal Research:
Animal Facts
Animal Database
A-Z List of Animals
Get the (Animal) Facts
World Book Kids

Scientific Method:
Observation Skills Activity (pdf)
Scientific Method
Scientific Method (BrainPOP Jr. video and activities)
Scientific Method (website created by children)
Scientific Method Poem (pdf)  

Other Resources:
EcoKids
National Geographic Kids 
National Wildlife Federation
Project Wild