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How are botanical gardens useful in cons...

How are botanical gardens useful in conserving biodiversity ? Define the terms Flora, manuals, monographs and catalogues ?

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Botanical gardens have collections of living plants for reference. Plant species in these gardens are grown for identification purposes and each plant is labelled indicating its botanical name and its family.
Flora : It contains the actual account of habitat, distrbution and systematic listing of plants of a given area.
Manual : it is a small book containing the information for identification of names of species found in an area.
Monograph : They contain information on any one taxon.
Catelogues :Books which help in correct identification of plants.
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