Photosynthesis 211 photosynthesis 54 Metabolism 52 Physiology 45 Plant physiology 43 Biochemistry 40 Plant cell 30 metabolism 29 Respiration 20 morphology 18 Biology 17 Photosynthesis-- Metabolism 17 PHOTOSYNTHESIS 16 Morphology 13 Plants 13 Enzymes 12 Proteins 11 Nutrition 10 Botanical chemistry 9 Plant Physiology 9 Botany 8 Cell division 8 Microbiology 8 Nucleic Acids 8 Plant cells 8 Biochemica et Biophysica Acta (Journal) 6 Molecular biology 6 genetics 6 Bacteria 5 Biochemical Phenomena 5