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Introduction References & Edit History Related Topics

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Structures of plant hormones

Examine the role of sunlight and gravity in phototropic and geotropic plant growth

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Demystified - Do Lemmings Really Commit Mass Suicide? illustration

Do Lemmings Really Commit Mass Suicide?

Mona Lisa, oil on wood panel by Leonardo da Vinci, c. 1503-06; in the Louvre, Paris, France. 77 x 53 cm.

Why Is the Mona Lisa So Famous?

Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,

Which Religion Is the Oldest?

Panoramic view at sunrise of moai, Ahu Tongariki, Easter Island (Rapa Nui), Chile

6 Lost Civilizations

International currencies, money, various banknotes, currency

A Brief (and Fascinating) History of Money

Secret Service Agent Listens To Earpiece

Secret Service Code Names of 11 U.S. Presidents

The Lost Colony of Roanoke, North Carolina, where 115 people mysteriously disappeared c. 1590. John White discovers the word Croatoan carved onto a tree upon his return to the deserted Roanoke Colony in 1590

The Lost Colony of Roanoke

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biochemistry

Videos

Examine the role of sunlight and gravity in phototropic and geotropic plant growth

Examine the role of sunlight and gravity in phototropic and geotropic plant growth

Plants' stems grow in the direction of a light source (phototropism), whereas their...

Video: Encyclopædia Britannica, Inc.

Images

Structures of plant hormones

Structures of plant hormones

Some plant hormones, such as abscisic acid and gibberellin, have cyclic structures.

Encyclopædia Britannica, Inc.

VIEW MORE in these related Britannica articles: