Ch. 39.3—Plant Responses to Internal & External Signals

Question 1

Effects of light on plant morphology are called:

Answer 1

-Photomorphogenesis.

Question 2

There are two major classes of light receptors:

Answer 2

• Blue-light Photoreceptors

- Phytochromes

Question 3

_______ ________: control hypocotyl elongation, stomatal opening, and phototropism

Answer 3

-Blue-Light Photoreceptors.

Question 4

_________: are pigments that regulate many of a plant’s responses to light throughout its life.

Answer 4

-Phytochromes.