21) Most angiosperms pollinated with the help of:
A) animals.
B) wind.
C) : 1380904.
21) Most angiosperms are pollinated with the help of:
A) animals.
B) wind.
C) water currents.
D) farming techniques.
E) fungi.
22) The reserve food in angiosperm seeds is stored in a special tissue called:
A) nectar.
B) the sporophyte.
C) endosperm.
D) the seed coat.
23) Fruit produced by angiosperms is most closely associated with which function?
A) pollination
B) seed dispersal
C) endosperm production
D) nourishing the embryo
E) thigmotropism
24) Which of the following would be an example of an adaptation for seed dispersal?
A) phototropism
B) pinecones
C) nectar production
D) seeds wrapped in burrs
E) deciduous cycles
25) A currently accepted hypothesis for gravitropism in plants is that:
A) sedimentation of organelles triggers hormone release.
B) microscopic eyespots trigger upward (skyward) growth.
C) ground contact inhibits stem growth while air stimulates it.
D) bending of leaves in response to gravity triggers growth in the opposite direction.
26) The hormone IAA helps plants to respond to and grow toward a light source by:
A) slowing growth under low light conditions.
B) increasing mitosis on the side of the shoot facing light.
C) elongating cells on the opposite side of the shoot facing light.
D) triggering release of growth factors at the tip of the stem.
27) You see a plant stem wrapped around a telephone pole, spiraling upward. This plant is demonstrating:
A) geotropism.
B) thigmotropism.
C) phototropism.
D) photoperiodism.
28) Long-night plants that only flower when they encounter a certain minimum number of hours of darkness are an example of:
A) geotropism.
B) thigmotropism.
C) phototropism.
D) photoperiodism.
29) Trees that intentionally lose their leaves according to coordinated, seasonal schedules are:
A) deciduous.
B) gametophytes.
C) sporophytes.
D) thigmotropic.
30) Diminished rewards of photosynthesis in winter along with the negatives of water loss and leaf damage cause many trees to exhibit:
A) photoperiodism.
B) dormancy.
C) thigmotropism.
D) phototropism.
21) Most angiosperms pollinated with the help of:
A) animals.
B) wind.
C) : 1380904
