Plants 22 Botany 13 Plant physiology 12 Biotechnology 11 Plant Breeding and Genetics 10 Metabolism 8 Plant Ecology 7 Biological Resources (Plant) 6 Genetic Engineering, Gene Transfer and Transgenics, (New June 2002) 6 Genetics 6 MEDICINAL PLANTS 6 Photosynthesis 6 Plant breeding 6 Plant tissue culture 6 Transgenic plants 6 Biotechnology (General), (Revised June 2002) 5 Field Crops, (New March 2000) 5 Genetically engineered organisms 5 Plant ecology 5 Taxonomy and Evolution 5 Agricultural Economics 4 Evolution 4 Genomics 4 Geographical distribution 4 Laboratory manuals 4 MEDICINAL PLANTS PRINCIPAL PLANTS EMPLOYED IN MEDICINE 4 Medicinal 4 Medicinal Plants 4 Molecular Biology and Molecular Genetics, (Discontinued March 2000, Reinstated and Revised June 2002) 4 Molecular biology 4