IB Biology: C3.1-Plant Hormones (Phytohormones)

Front

What are plant hormones called?

Back

Plant hormones are called phytohormones.

Front

What are phytohormones?

Back

Phytohormones are signaling molecules that control growth, development of flowers, fruits and seeds, and responses to external stimuli in plants.

Front

How do phytohormones affect plant growth?

Back

Phytohormones either promote or inhibit growth by affecting rates of cell division and cell enlargement.

Front

Give an example of a phytohormone and its function.

Back

Gibberellins are a type of phytohormone that promote stem growth.

Front

What aspects of development can phytohormones influence?

Back

Phytohormones can promote or inhibit growth of buds, growth of leaves, growth of flowers, and ripening of fruits.

Front

What are tropic responses in plants?

Back

Tropic responses, such as the coiling of tendrils by touch, are controlled by phytohormones.

Front

How do plants use electrical impulses?

Back

Plants use electrical impulses for rapid responses, such as the capture of insects by a Venus flytrap.