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B
Yolked keys
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C
Bracketed keys
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D
None of the above
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Solution
The correct option is A Yoked keys Keys are required for identification of species. It is a booklet containing a list of characters and their alternatives that are helpful in identification of various taxa. There are two types of key. The indented or yoked key which gives two or more alternate characteristics which are used to make choice by rejecting or selecting. Bracketed key, the key does not separate by characters but subdivide them by giving them number in brackets