Question

Choose the correct answer from the alternatives given.
One of the chief differences between pheromones and local hormones is:

• A. the distance over which they act
• B. that one is a chemical messenger and the other is not
• C. that one is made by invertebrates and the other is made by vertebrates
• D. all of the above

Answer 1

The correct option is A the distance over which they act

Local hormones - A number of hormones are secreted by the cells but not in glands and widely dispersed in the body are called local hormones. Example are histamine, prostaglandins, etc.

Pheromones are chemicals used for communication amongst the organism of the same species.

So the correct answer is the distance over which they act.