- The National Botanical Research Institute (NBRI) is located in Lucknow. - NBRI maintains extensive botanical gardens often referred to as the National Botanical Garden. While the term "Biological Garden" isn't the standard terminology for NBRI's gardens, among the given options, Lucknow is home to the most prominent national-level institution focused on botanical research with significant gardens. - Other cities like Bengaluru have important botanical gardens (Lal Bagh), but NBRI in Lucknow is a national research institute under CSIR with associated gardens.