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:

Which of the following is not a method of ex situ conservation?

Habitat loss and fragmentation, over exploitation, alien species invasion and co-extinction are causes for :

In-situ conservation refers to :