B) Condition 2 only
C) Conditions 1 and 2
D) Conditions 2 and 3
Scarlet gilia (Ipomopsis aggregata) usually has red flowers in an inflorescence of up to
250 flowers. In certain populations in the Arizona mountains, however, the flowers
range from red to pink to white. In early summer, most of the flowers were red. Six to
eight weeks later, the same individual plants were still present; the flowers ranged from
pink to white, and few red flowers were present. The major pollinators early in the
season were two species of hummingbirds active during the day; they emigrated to
lower elevations, and the major pollinator later in the season was a hawk moth (a type
of moth). The hawk moth was most active at sunset and later, and it preferred light pink
to white flowers after dark. When hummingbirds were present, more red flowers than
white flowers produced fruit. When only hawk moths were present, more white flowers
produced fruit (K. N. Paige and T. G. Whitham. 1985. Individual and population shifts
in flower color by scarlet gilia: A mechanism for pollinator tracking. Science
Refer to the paragraph on scarlet gilia. What is the significance of measuring fruit
A) It is a measure of pollination success.
B) It is a measure of seed dispersal success.
C) It is easier than counting flowers.
D) It is an indication of predation on the seeds of the plants.