UVIC BIO 150B FINAL EXAM VERIFIED ANSWERS
Dormancy - ANSWER -A period when plant growth and
development temporarily stop to survive unfavorable
conditions.
Abscisic acid (ABA) - ANSWER -A hormone that promotes
seed dormancy and inhibits germination until conditions
are right.
Dormancy-breaking stimuli - ANSWER -Environmental
cues like water, light, cold, or fire that end dormancy and
trigger germination.
,Phytochrome - ANSWER -A light-sensitive pigment that
toggles between forms to regulate germination and
flowering.
Far-red reversibility - ANSWER -The ability to reverse red
light responses (like germination) with far-red light via
phytochrome.
Pr - ANSWER -The inactive phytochrome form that
absorbs red light and converts to Pfr.
Pfr - ANSWER -The active phytochrome form that
absorbs far-red light and initiates developmental
responses.
Photomorphogenesis - ANSWER -Developmental
changes in plants triggered by light (e.g., inhibited stem
elongation, leaf expansion).
,Seedling shoot elongation - ANSWER -The growth of
young shoots, typically enhanced in darkness and
reduced by light.
Auxin - ANSWER -A hormone that promotes cell
elongation, root development, and suppresses lateral
shoot growth.
Cytokinin - ANSWER -A hormone that promotes cell
division and shoot growth; delays leaf aging.
Hormone balance - ANSWER -The relative levels of
hormones like auxin and cytokinin that determine growth
patterns.
Root-shoot balance - ANSWER -Coordinated growth
where auxin promotes roots and cytokinin promotes
shoots.
, Cohesion-tension theory - ANSWER -Explains water
transport in xylem via transpiration, cohesion, and
negative pressure.
Negative pressure (tension) - ANSWER -A pulling force
created by water evaporating from leaves, drawing water
upward.
Cohesion - ANSWER -Attraction between water
molecules that maintains a continuous water column in
xylem.
Adhesion - ANSWER -Attraction of water molecules to
xylem walls that helps counter gravity.
Transpiration - ANSWER -Evaporation of water from
leaves that drives water movement through the plant.
Dormancy - ANSWER -A period when plant growth and
development temporarily stop to survive unfavorable
conditions.
Abscisic acid (ABA) - ANSWER -A hormone that promotes
seed dormancy and inhibits germination until conditions
are right.
Dormancy-breaking stimuli - ANSWER -Environmental
cues like water, light, cold, or fire that end dormancy and
trigger germination.
,Phytochrome - ANSWER -A light-sensitive pigment that
toggles between forms to regulate germination and
flowering.
Far-red reversibility - ANSWER -The ability to reverse red
light responses (like germination) with far-red light via
phytochrome.
Pr - ANSWER -The inactive phytochrome form that
absorbs red light and converts to Pfr.
Pfr - ANSWER -The active phytochrome form that
absorbs far-red light and initiates developmental
responses.
Photomorphogenesis - ANSWER -Developmental
changes in plants triggered by light (e.g., inhibited stem
elongation, leaf expansion).
,Seedling shoot elongation - ANSWER -The growth of
young shoots, typically enhanced in darkness and
reduced by light.
Auxin - ANSWER -A hormone that promotes cell
elongation, root development, and suppresses lateral
shoot growth.
Cytokinin - ANSWER -A hormone that promotes cell
division and shoot growth; delays leaf aging.
Hormone balance - ANSWER -The relative levels of
hormones like auxin and cytokinin that determine growth
patterns.
Root-shoot balance - ANSWER -Coordinated growth
where auxin promotes roots and cytokinin promotes
shoots.
, Cohesion-tension theory - ANSWER -Explains water
transport in xylem via transpiration, cohesion, and
negative pressure.
Negative pressure (tension) - ANSWER -A pulling force
created by water evaporating from leaves, drawing water
upward.
Cohesion - ANSWER -Attraction between water
molecules that maintains a continuous water column in
xylem.
Adhesion - ANSWER -Attraction of water molecules to
xylem walls that helps counter gravity.
Transpiration - ANSWER -Evaporation of water from
leaves that drives water movement through the plant.
