Plant hormone is called

Correct Answer: B — Phytohormone

Explanation:

Plant hormones are chemical messengers that regulate growth, development, and responses to environmental stimuli in plants.

These hormones are called phytohormones.

Examples include auxins, gibberellins, cytokinins, ethylene, and abscisic acid.

Other options:

Pheromone: Chemical signal released by animals to communicate with others of the same species

Enzyme: Biological catalyst that speeds up chemical reactions

Hence, the correct option is B — Phytohormone.