Which method is used in the process of poisoning (preservation of biological specimens)?

Why is the fumigation process carried out in a herbarium?

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:

What is the main artistic attraction of the Indian Botanical Garden, Shibpur?

Which method is used for the preservation of dead bodies of large-sized animals?

Where is the Rani Jijamata Udyan (Veermata Jijabai Bhosale Udyan and Zoo) located?