Department of Energy Argonne National Laboratory Office of Science NEWTON's Homepage NEWTON's Homepage
NEWTON, Ask A Scientist!
NEWTON Home Page NEWTON Teachers Visit Our Archives Ask A Question How To Ask A Question Question of the Week Our Expert Scientists Volunteer at NEWTON! Frequently Asked Questions Referencing NEWTON About NEWTON About Ask A Scientist Education At Argonne Purple cabbage
Name: Rachel Unterman
Location: N/A
Country: N/A
Date: N/A 

I am 11 years old. I have seen purple cabbage. Why is grass green, not purple?

All land plants contain Chlorophyll which makes them look green. However, some plants have other colors called pigments which hide then green color of chlorophyll. Many plants with purple pigment use the darker color like we use sunglasses, it shades the plant from parts of the sun's light that would harm the plant. Different colors protect the plant from different types of harmful sun rays. Grass must not need to be protected from the same type of sun rays than does the cabbage.


Click here to return to the Biology Archives

NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.

For assistance with NEWTON contact a System Operator (, or at Argonne's Educational Programs

Educational Programs
Building 360
9700 S. Cass Ave.
Argonne, Illinois
60439-4845, USA
Update: June 2012
Weclome To Newton

Argonne National Laboratory