In angiosperms, each pollen grain produces two sperm. What do these sperm do?
answer
One fertilizes an egg, and the other combines with two polar nuclei, which develop into stored food cells (endosperm).
question
The germination of seeds _____.
answer
depends on imbibition
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Which association below is correct?
answer
dioecious ... separate female and male plants
question
Which of the following is an example of sexual reproduction?
answer
fusion of sperm and egg nuclei in an ovule
question
Which of the following is an advantage of asexual reproduction in plants?
answer
enhanced survival of genetically favorable offspring
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Self-incompatibility _____.
answer
helps maintain genetic variability in a population
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In grafting, the plant that provides the root system is the _____ and the twig is the _____.
answer
stock...scion
question
Select the correct statement about double fertilization in the angiosperm life cycle.
answer
Double fertilization produces a diploid sporophyte and a triploid endosperm.
question
Which of these represents the male gametophyte generation of an angiosperm?
answer
cells within a pollen grain
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Which of these structures is/are produced by fertilization of egg and sperm?
answer
an embryonic sporophyte
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Which of these represents the female gametophyte generation of an angiosperm?
answer
an embryo sac
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Select the correct statement(s) about angiosperm seeds.
A. The embryo in an angiosperm seed is the offspring of the sporophyte plant.
B. An angiosperm seed contains structures contributed by three generations of plants.
C. All structures in an angiosperm seed are diploid.
answer
B. An angiosperm seed contains structures contributed by three generations of plants
question
A fruit is _____.
answer
a mature ovary
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Double fertilization means that _____.
answer
one sperm is needed to fertilize the egg, and a second sperm is needed to fertilize the polar nuclei.
question
The black dots that cover strawberries are actually individual fruits. The fleshy and tasty portion of a strawberry derives from the receptacle of a flower with many separate carpels. Therefore, a strawberry is
answer
both an aggregrate fruit and an accessory fruit.
question
Many aspects of the angiosperm life cycle make flowering plants particularly well-suited to life on land. In fact, angiosperms are the most diverse and widespread of all plants.
Which six of the following statements reflect angiosperm adaptations to life on land?
answer
-Flowers attract animal pollinators carrying pollen from other plants of the same species
-Fruits aid in the dispersal of seeds by wind or by animals that carry or eat the fruits.
-In many angiosperms, the male gametophyte contained in a pollen grain can be transported many miles away by wind or animal pollinators.
-Floral parts of the sporophyte protect the reduced female gametophyte from drying out and from UV radiation.
-Seeds protect and nourish plant embryos, and fruits protect the seeds.
-Seeds enable plant embryos to be dispersed long distances from the parent plant via wind or animals
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