BIO1108 - MODULE 2 EXAM
REPORTED QUESTIONS WITH
CORRECT ANSWERS
Which of the following is/are true of pollen and embryo sacs (select all that apply):
A. They are gametophytes
B. They are sporophytes
C. They are stages in the angiosperm life cycle that produce gametes
D. They are stages in the angiosperm life cycle that produce spores
E. They are multicellular
F. They are single-celled
G. Pollen is single-celled; the embryo sac is multicellular - Answer- A, C, E
pollen - male gametophyte
embryo sacs - female gametophyte
Two flowers are both brightly colored and only open during the day, but flower A is
highly scented and flower B is not.
A. Flower A is most likely pollinated by an animal pollinator; flower B by wind
B. Flower A is most likely pollinated by a bird; flower B by an insect
C. Flower A is most likely pollinated by an insect; flower B by a bird
D. Both flowers could be pollinated by either an insect or a bird
E. Both flowers could be pollinated by either wind or an animal - Answer- C
An ovary contains 20 ovules. Each ovule contains an egg and an endosperm, each of
which must be fertilized by a sperm cell. How many pollen grains are required in order
for all 20 ovules to develop into viable seeds with embryos and endosperm?
,A. Ten, since each pollen tube produces two sperm.
B. Forty, since double fertilization requires two pollen to fertilize each embryo sac.
C. One, since pollen tubes can release more than one sperm.
D. Twenty, since each pollen tube releases two sperm.
E. Two, since one pollen tube will release sperm and the other will release eggs. -
Answer- D
still 1 pollen grain: 1 ovule ratio
just double fertilizes
If a dehydrated seed must re-imbibe water in order to germinate, what is the advantage
of drying out to begin with?
A. lighter in weight to facilitate dispersal
B. delay germination until conditions are good
C. protect seed from freezing to death
D. improve transfer of material from endosperm prior to germination - Answer- A, B, C
What is the advantage of a seed requiring a cue to break dormancy?
A. The cue ensures the seed has grown to a large enough size during dormancy.
B. The cue indicates the appropriate pollinator is present to fertilize the seed.
C. The cue indicates the environmental conditions are likely to support seedling growth.
D. The cue ensures the seed's fruit has fully ripened. - Answer- C
Match each structure with its function in sexual reproduction of angiosperms. - Answer-
Stamen - Contains all structures related to "male" part of angiosperm
Carpel - Contains all structures related to "female" part of angiosperm
Filament - Stalk linking anther to flower
Ovary - Structure in the carpel that contains the megasporocytes
Anther - Structure in the stamen that contains the microsporocytes
,Pollen grain - The male gametophyte
Petal - Attract pollinators
Sepal - Protect the developing flower bud
Stigma - Structure that receives pollen
Style - Stalk that links stigma to ovary
Embryo sac - The female gametophyte
Contact of a sperm with bindin on the coat of an egg causes the sperm to undergo
A. the acrosomal reaction.
B. polarization.
C. depolarization.
D. mitosis.
E. meiosis. - Answer- A
In mammalian eggs, the fertilization envelope
A. Prevents more than one sperm from fertilizing the egg
B. Arises as a result of the cortical reaction
C. Causes the egg to implant in the uterine lining
D. A and B
E. All of the above - Answer- D
Cytoplasmic determinants:
A. Are extrinsic factors that control embryonic development
B. Occur in protostomes instead of induction
C. Cause differences in gene expression
D. Are the only factor that can establish cell identity during development
E. All of these are true - Answer- C
The jelly layer of the egg:
A. Prevents multiple sperm from fertilizing the egg
B. Attracts sperm to the egg
, C. Protects the egg against drying out
D. Is the location of the cortical reaction - Answer- B
The latest point at which a random, single cell could break off from a human embryo to
form an identical twin is:
A. Immediately prior to fertilization
B. Immediately following fertilization, but prior to egg activation
C. During cleavage divisions
D. During or immediately after gastrulation
E. After gastrulation, but before neural tube formation
F. None of these; identical twins arise from fertilization of two independent eggs -
Answer- C
The primary embryonic germ layers of vertebrates are formed and move into their
proper locations during which process?
A. early cleavage to form the morula.
B. the formation of the blastula.
C. the formation of the gastrula.
D. neurulation and establishment of the dorsal hollow nerve tube.
E. after neurulation and initiation of organogenesis - Answer- C
Which structure is incorrectly paired with its embryonic germ layer?
A. Brain and nerves---mesoderm
B. Lungs---endoderm
C. Skin---ectoderm
D. Heart---mesoderm
E. Digestive system---endoderm
F. All of the above are correct pairings - Answer- A
During animal development, changes in cell position occur extensively during _____.
A. cleavage, but not during gastrulation or organogenesis
REPORTED QUESTIONS WITH
CORRECT ANSWERS
Which of the following is/are true of pollen and embryo sacs (select all that apply):
A. They are gametophytes
B. They are sporophytes
C. They are stages in the angiosperm life cycle that produce gametes
D. They are stages in the angiosperm life cycle that produce spores
E. They are multicellular
F. They are single-celled
G. Pollen is single-celled; the embryo sac is multicellular - Answer- A, C, E
pollen - male gametophyte
embryo sacs - female gametophyte
Two flowers are both brightly colored and only open during the day, but flower A is
highly scented and flower B is not.
A. Flower A is most likely pollinated by an animal pollinator; flower B by wind
B. Flower A is most likely pollinated by a bird; flower B by an insect
C. Flower A is most likely pollinated by an insect; flower B by a bird
D. Both flowers could be pollinated by either an insect or a bird
E. Both flowers could be pollinated by either wind or an animal - Answer- C
An ovary contains 20 ovules. Each ovule contains an egg and an endosperm, each of
which must be fertilized by a sperm cell. How many pollen grains are required in order
for all 20 ovules to develop into viable seeds with embryos and endosperm?
,A. Ten, since each pollen tube produces two sperm.
B. Forty, since double fertilization requires two pollen to fertilize each embryo sac.
C. One, since pollen tubes can release more than one sperm.
D. Twenty, since each pollen tube releases two sperm.
E. Two, since one pollen tube will release sperm and the other will release eggs. -
Answer- D
still 1 pollen grain: 1 ovule ratio
just double fertilizes
If a dehydrated seed must re-imbibe water in order to germinate, what is the advantage
of drying out to begin with?
A. lighter in weight to facilitate dispersal
B. delay germination until conditions are good
C. protect seed from freezing to death
D. improve transfer of material from endosperm prior to germination - Answer- A, B, C
What is the advantage of a seed requiring a cue to break dormancy?
A. The cue ensures the seed has grown to a large enough size during dormancy.
B. The cue indicates the appropriate pollinator is present to fertilize the seed.
C. The cue indicates the environmental conditions are likely to support seedling growth.
D. The cue ensures the seed's fruit has fully ripened. - Answer- C
Match each structure with its function in sexual reproduction of angiosperms. - Answer-
Stamen - Contains all structures related to "male" part of angiosperm
Carpel - Contains all structures related to "female" part of angiosperm
Filament - Stalk linking anther to flower
Ovary - Structure in the carpel that contains the megasporocytes
Anther - Structure in the stamen that contains the microsporocytes
,Pollen grain - The male gametophyte
Petal - Attract pollinators
Sepal - Protect the developing flower bud
Stigma - Structure that receives pollen
Style - Stalk that links stigma to ovary
Embryo sac - The female gametophyte
Contact of a sperm with bindin on the coat of an egg causes the sperm to undergo
A. the acrosomal reaction.
B. polarization.
C. depolarization.
D. mitosis.
E. meiosis. - Answer- A
In mammalian eggs, the fertilization envelope
A. Prevents more than one sperm from fertilizing the egg
B. Arises as a result of the cortical reaction
C. Causes the egg to implant in the uterine lining
D. A and B
E. All of the above - Answer- D
Cytoplasmic determinants:
A. Are extrinsic factors that control embryonic development
B. Occur in protostomes instead of induction
C. Cause differences in gene expression
D. Are the only factor that can establish cell identity during development
E. All of these are true - Answer- C
The jelly layer of the egg:
A. Prevents multiple sperm from fertilizing the egg
B. Attracts sperm to the egg
, C. Protects the egg against drying out
D. Is the location of the cortical reaction - Answer- B
The latest point at which a random, single cell could break off from a human embryo to
form an identical twin is:
A. Immediately prior to fertilization
B. Immediately following fertilization, but prior to egg activation
C. During cleavage divisions
D. During or immediately after gastrulation
E. After gastrulation, but before neural tube formation
F. None of these; identical twins arise from fertilization of two independent eggs -
Answer- C
The primary embryonic germ layers of vertebrates are formed and move into their
proper locations during which process?
A. early cleavage to form the morula.
B. the formation of the blastula.
C. the formation of the gastrula.
D. neurulation and establishment of the dorsal hollow nerve tube.
E. after neurulation and initiation of organogenesis - Answer- C
Which structure is incorrectly paired with its embryonic germ layer?
A. Brain and nerves---mesoderm
B. Lungs---endoderm
C. Skin---ectoderm
D. Heart---mesoderm
E. Digestive system---endoderm
F. All of the above are correct pairings - Answer- A
During animal development, changes in cell position occur extensively during _____.
A. cleavage, but not during gastrulation or organogenesis
