Which one of the taxonomic aids can give comprehensive account of complete compiled information of any one genus or family at a particular time?

Which of the following are true about the taxonomical aid 'key'?
$(a)$ Keys are based on the similarities and dissimilarities.
$(b)$ Key is analytical in nature.
$(c)$ Keys are based on the contrasting characters in pair called couplet.
$(d)$ Same key can be used for all taxonomic categories.
$(e)$ Each statement in the key is called Lead.
Choose the most appropriate answer from the options given below:

For which of the following are $Bentham$ and $Hooker$ remembered?

Study the following statements and select the correct description of botanical garden.
$(i)$ Plant species are grown for identification purposes.
$(ii)$ Labeling of each plant consists of its botanical name/scientific name and its family.
$(iii)$ Specimens are preserved in the jars and containers.
$(iv)$ It is a type of storehouse which contains dried,pressed and preserved plant specimens on sheets.

An institution where different types of wild animals are kept in protected environments under human care and exhibited to the public is known as .......

What kind of plants are grown in botanical gardens?