In nature, nicotine acts as a(n)

A. Growth agent in plants
B. Insecticide.
C. Nutrient.
D. Plant pigment

B. Insecticide.

B. Insecticide.

Nicotine is naturally found in tobacco plants and acts as a natural defense mechanism against insects. It acts as an insecticide by interfering with the nervous system of insects, ultimately leading to their paralysis or death.