Choose the One Most Appropriate Answer for Each

Multiple Choice

Choose the one most appropriate answer for each. Each letter will be used once.
-circadian rhythm

A) growth response that orients parts of a plant in a direction influenced by light
B) burst of hydrogen peroxide and nitric oxide that causes infected cells to commit suicide
C) an organism's response to changes in length of day relative to night
D) organelle involved in sensing gravity
E) light-sensitive pigment that helps set plant circadian rhythm based on length of night
F) flowering after a long season of cold temperatures
G) closes stomata in times of stress
H) initiates fruit ripening in nearby fruits
I) flowers only when hours of darkness fall below a critical value
J) flavonoid in cocoa responsible for the unusual absence of heart disease in the Kuna
K) occurring on a 24-hour cycle
L) flowers only when hours of darkness are greater than some critical value
M) activates systemic acquired resistance
N) inhibits the growth of lateral roots
O) mobilizes food reserves in germinating seeds