Which one of the following is called intra-specific chemical messenger?

Pheromones

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Prostaglandins

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Corticotrophin

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Catecholamines

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Solution

The correct option is A Pheromones
Pheromones are the intra-specific chemical messenger which are released outside the body by the individuals to impact the behavior of the receiving individuals. Sex pheromones are released to attract the partners for mating. Ants use trail pheromones to mark their path. Aggregation pheromones are used as a defense against a predator. So, the correct answer is option A.

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Hormones are called chemical signals that stimulate specific target tissues. Which is the correct location of these receptors in of protein hormones?

(a) Extra cellular matrix

(b) Blood

(d) Nucleus

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