Which of the following are true about the taxonomical aid 'key'? Choose the most appropriate answer from the options given below:
- A, C, D and E only
- A, B and C only
- B, C and D only
- A, B, C and E only
Answer
(4) A, B, C and E only
Solution
As per NCERT, key is a taxonomical aid used for identification of plants and animals based on the similarities and dissimilarities — A is true.
⇒ Keys are analytical in nature — B is true.
⇒ The keys are based on contrasting characters, generally in a pair called couplet — C is true.
⇒ Each statement in the key is called a lead — E is true.
⇒ Separate taxonomic keys are required for each taxonomic category such as family, genus and species — D is false.
∴ A, B, C and E are true.
Answer: (4)