Which Hormone Promotes Stem Elongation and Was First Discovered While

question 98

Multiple Choice

Which hormone promotes stem elongation and was first discovered while studying the growth of extremely tall and spindly rice plants?

• A) Abscisic acid
• B) Auxin
• C) Cytokinin
• D) Ethylene
• E) Gibberellin

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Definitions:

Milk Letdown

Expulsion of milk from the alveoli of the mammary glands; stimulated by oxytocin.

Prolactin

Hormone of the adenohypophysis that stimulates the production of milk.

Oxytocin

A hormone released by the pituitary gland that causes increased contraction of the uterus during labor and stimulates the ejection of milk into the ducts of the breasts.

Uterine Smooth Muscle

The muscle tissue in the uterus, responsible for the contractions during menstruation and childbirth.