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1
The hormone responsible for phototropic responses in the growing tips of plants is
A)auxin.
B)cytokinin.
C)gibberellin.
D)ethylene.
2
Tomatoes can be artificially ripened through the use of
A)auxin.
B)cytokinins.
C)gibberellins.
D)ethylene.
3
Which of the following is (are) not associated with germination?
A)Increase in water content
B)Resumption of metabolism
C)Intake of oxygen
D)Intake of carbon dioxide
4
The female part of the flower consists of all of the following except
A)stigma.
B)stamen.
C)style.
D)ovary.
5
Synthetic auxins are routinely used to
A)increase the fruit yield of crops.
B)intensify the green color in grass.
C)minimize the amount of fertilizer needed.
D)act as a herbicide.
6
The liquid produced in the flower of a plant which is rich in sugar, amino acids, and other substances and which is the reward sought by animals during pollination is
A)ethylene.
B)nectar.
C)auxin.
D)honey.
7
The evolution of fruits is important to angiosperms for successful pollination.
A)True
B)False
8
What plant hormone, in combination with auxin, stimulates cell division in plants and determines the course of differentiation?
A)Abscisic acid
B)Gibberellin
C)Cytokinin
D)Ethylene
9
In photoperiodism, most spring flowers are examples of
A)short-day plants.
B)long-day plants.
C)day-positive plants.
D)day-neutral plants.
10
The growth response of a plant to an external stimulus is called
A)dormancy.
B)photoperiodism.
C)tropism.
D)adhesion.
11
Auxin promotes growth in plants by
A)increasing the plasticity of plant cell walls.
B)stimulating the uptake of water by seeds.
C)causing elongation of stems.
D)increasing the rate of photosynthesis.
E)promoting root tip growth.
12
Abscisic acid is a plant hormone that causes
A)stoma to close on leaves.
B)growth of lateral buds into branches.
C)stem elongation.
D)increased synthesis of chlorophyll.
13
A commonly observed response of plants is the response of touch.
A)True
B)False
14
In angiosperms male and female reproductive structures usually develop ______________________.
A)in separate plants.
B)on different flowers on the same plant.
C)in the same flower.
D)at different times so self-fertilization is avoided.
E)at the same time so self-fertilization is ensured.
15
In angiosperms that rely on wind for pollination they must
A)produce copious amounts to ensure pollination occurs.
B)grow close together to ensure pollination.
C)produce a foul odor to discourage insect pollinators.
D)produce a foul odor to discourage bird pollinators.
E)1, 2 and 4 are true
16
Double fertilization in flowering plants results in 2 zygotes.
A)True
B)False
17
Which of the following fruits is a drupe?
A)Grape
B)Apples
C)Plums
D)Peppers
18
In angiosperms tissue differentiation in the embryo begins
A)when the seed germinates.
B)when the basal cell is stimulated by auxin.
C)after the flower dies.
D)almost immediately after fertilization.
E)after the cotyledons are fully grown.
19
Runners, rhizomes, and suckers are all examples of
A)different forms of vegetative reproduction.
B)alternative names for roots.
C)different types of stems.
D)different types of insect pollinators.
20
In plants, the male gametophyte is a(n)
A)embryo.
B)pollen grain.
C)magaspore cell.
D)generative cell.





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