plant hormones

Which external signal is the most important for plants?

______ is the most important external signal perceived by plants.

Light is the most reliable external signal to convey information to plants about ______ of year.

Which hormone is responsible for preventing precocious germination and mediating stomatal closure in drought-stressed plants?

What is the primary external signal that plants use to convey information about time of year?

True or false: Plants do not produce hormones in response to external stimuli.

What is the most reliable external signal that conveys information to plants about time of year?

What is the major plant hormone that promotes stem elongation and apical dominance?

What do plants use their photoreceptors to detect?

The major plant hormone, ______, promotes stem elongation and apical dominance.

What do plants use photoreceptors for?

True or false: The most important external signal perceived by plants is temperature.

Temperature can vary substantially from year to year, unlike the predictable nature of the sun's orbit and the quantity of ______.

Which hormone promotes stem elongation and apical dominance?

Which part of the plant has blue light receptors that function to detect the direction of light?

Which hormone controls cell division and mobilizes nutrients to sink tissues?

What do cytokinins control in plants?

True or false: Plant hormones have no effect on physiological processes.

What is the function of blue light receptors in plants?

______ control cell division and mobilize nutrients to sink tissues.

Plants have evolved photoreceptors to detect both the quality and quantity of ______ to know precisely what time of the day and year it is.

______ promote stem elongation, fruit growth, and seed germination.

Which hormone is responsible for leaf abscission and fruit ripening?

Which hormone is responsible for leaf abscission and fruit ripening?

True or false: Cytokinins promote stem elongation and apical dominance.

What does the phytochrome pigment detect?

What does the phytochrome pigment detect?

Shoot apical meristems and guard cells have blue light receptors that function to detect the direction of light and trigger responses for cell elongation and ______ pore opening.

What is the role of gibberellins in plants?

What is the biologically active form of the phytochrome pigment?

True or false: Gibberellins only promote fruit growth.

What is the phytochrome?

______ prevents precocious germination and mediates stomatal closure in drought-stressed plants.

The phytochrome pigment detects red and far-red light and responds by controlling seed germination, shade avoidance and ______.

What is the result of the interplay of auxin and cytokinin?

______ is responsible for leaf abscission and fruit ripening.

True or false: Abscisic acid promotes precocious germination.

Plants respond to a wide range of abiotic and biotic stressors, such as drought, flooding, salt, ______, and cold stress.

What is photoperiodism?

Which hormone promotes stem elongation, fruit growth, and seed germination?

What is the function of abscisic acid in drought-stressed plants?

What do plants synthesize in response to excessive heat?

True or false: Ethylene is responsible for leaf growth.

Apical dominance is the result of the interplay of ______ and cytokinin.

Which external signal is the most important one perceived by plants?

How do plants alter the degree of saturation of lipids in the plasma membranes in response to cold temperatures?

Plants alter their physiological processes in response to stressors, such as the synthesis of ______ shock proteins in response to excessive heat.

Why are plants better suited to responding to external stimuli?

What is the result of the interplay of auxin and cytokinin?

Why are plant responses to changing light conditions crucial?

What can be controlled by plant hormones?

Plant form and function are important to ensure that a plant gets sufficient amounts of light to drive photosynthesis and ultimately sponsor sexual ______.

Which organism is better suited to responding to external stimuli, plants or animals?

What process can be controlled by hormones?

True or false: Apical dominance is solely controlled by cytokinins.

Asexual regeneration and vegetative propagation can be controlled by ______.