Find spinach stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection. Thousands of new, high-quality pictures added every day.However, photosynthetic adjustment in cold-grown higher plants and algae does not reflect adjustment to low temperature per se, but rather, changes in excitation pressure on PS II. In contrast, photosynthesis in chilling-sensitive plants is not only constrained thermodynamically by low...photopigments, and the conditions required to allow photosynthesis and/or respiration to occur, in the following activities. A. Paper Chromatography of Leaf Photopigments 1. Obtain a strip of chromatography paper and a piece of spinach or other sample. 2. Use a ruler to measure and draw a light pencil line 2 cm above the bottom of the paper strip.