Biosphere reserves are multipurpose protected areas. These are the regions which are meant for preserving genetic diversity in representative ecosystems of various natural biomes and unique biological communities by protecting wildlife, domesticated plant and animal genetic resources. Nilgiri biosphere reserve in Kerala, Karnataka and Tamil Nadu was the first to be established in the year 1986. The flora is the plant life found in the particular region. The reserve preserves the species of orchids like Vanda and Liparis. There are other plants like Jarodina, Calacanthus, etc.
Thus, the correct answer is option A.