lesson 11 pt 3

Which external signal is the most important for plants?

Plants produce ________ that regulate growth and development in response to external stimuli.

True or false: Plants do not produce hormones that regulate growth and development in response to external stimuli.

True or false: Water is the most important external signal perceived by plants.

Light is the most important external signal perceived by ________.

Which of the following is NOT one of the classic plant hormones?

Plant hormones are chemical signals that modify or control ________ processes.

Which hormone promotes stem elongation and delays leaf abscission?

True or false: Plant hormones are physical signals that modify or control physiological processes.

The five classic plant hormones are auxin, cytokinins, gibberellins, abscisic acid, and ________.

Which hormone controls cell division and differentiation?

True or false: The four classic plant hormones are auxin, cytokinins, gibberellins, and ethylene.

Which hormone encourages growth by promoting both cell elongation and division?

True or false: Auxin delays stem elongation, apical dominance, vascular differentiation, and promotes leaf abscission.

Auxin promotes stem elongation, apical dominance, vascular differentiation, and delays ________ abscission.

True or false: Cytokinins control cell division and differentiation, and inhibit nutrient mobilization to sink tissues.

Which hormone prevents precocious germination and mediates the rapid closure of stomata in drought-stressed plants?

Cytokinins control cell division and differentiation, and mobilize nutrients to ________ tissues.

Which hormone is responsible for leaf abscission and fruit ripening?

Gibberellins encourage growth by promoting both cell elongation and division, and promote seed ________.

True or false: Gibberellins encourage growth by promoting only cell elongation, and inhibit seed germination.

True or false: Abscisic acid promotes precocious germination, and mediates the rapid opening of stomata in drought-stressed plants.

Which physiological process is NOT controlled by plant hormones?

Abscisic acid prevents precocious germination, and mediates the rapid closure of stomata in ________-stressed plants.

True or false: Ethylene is responsible for leaf abscission and fruit ripening.

Which hormone is involved in apical dominance, asexual regeneration, and vegetative propagation?

Ethylene is responsible for leaf abscission and fruit ________.

Which hormone mobilizes nutrients to sink tissues?

Hormones often work in concert and combination, for example in apical dominance, asexual regeneration, and ________ propagation.

True or false: Hormones work independently and do not interact with each other.