The first step that leads to the evolution of the seed plant life cycle was likely:
A. dispersal of gametophytes instead of spores.
B. spores that could develop into either male or female gametophytes.
C. bisexual gametophytes
D. the production of two types of spores in separate and different sporangia.
The first step that leads to the evolution of the seed plant life cycle was likely:
| A. | dispersal of gametophytes instead of spores. | |
| B. | spores that could develop into either male or female gametophytes. | |
| C. | bisexual gametophytes | |
| D. | the production of two types of spores in separate and different sporangia. |
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Related questions
In a dihybrid cross, a pure-bred purple elongate radish variety was crossed with a pure-bred white round radish variety. All F1 radishes were purple and round.
When F1 plants were selfed, the F2 population showed the following phenotypes; 39 purple elongate : 80 purple round : 41 white round. How would you explain this segregation ratio?
| A. White and elongate alleles are dominant; allele for white is genetically linked to allele for elongate | |||||||||||||
| B. Purple and Round alleles are dominant; allele for purple is genetically linked to allele for elongate | |||||||||||||
| C. Purple and white alleles are semidominant; Round allele is dominant to elongate allele | |||||||||||||
| D. Purple and white alleles are codominant; round and elongate alleles are also codominant Which of these are true about heterospory? Choose all that apply.
|
Question 1
The key innovation that allowed for plant survival on land, seenin the first land plants and all others after, but not in thecharophytes, is
Question 1 options:
fruit. | |
vascular tissue. | |
the seed. | |
protection of the embryo. |
Question 2
Which dramatic change in the alternation-of-generations lifecycle led to the protection of all phases of the life cycle and theformation of seeds?
Question 2 options:
transition from a dominant gametophyte generation to a dominantsporophyte generation | |
transition from a dominant sporophyte generation to a dominantgametophyte generation |
Question 3
Which structure(s) allow the sporophyte of vascular plants to beprotected against drying out?
Question 3 options:
the waxy covering of leaves, called the cuticle | |
small openings in the leaves, called stomata | |
guard cells that surround each stoma | |
all of these structures protect the dominant sporophyte fromdrying out |
Question 4
Why are the bryophytes called nonvascular plants?
Question 4 options:
because they are specialized for transporting water and organicnutrients | |
because their roots, stems, and leaves lack vascular tissue | |
because they protect their embryo | |
because they produce wind-blown spores |
Question 5
Which generation is dominant in the bryophytes?
Question 5 options:
the generations are equally dominant | |
the sporophyte | |
the gametophyte | |
there is no sporophyte generation in bryophytes |
Question 6
Which of the bryophytes are typically low-lying, due mostly totheir need for moisture and lack of vascular tissue?
Question 6 options:
the mosses | |
the liverworts | |
the hornworts | |
all of the bryophytes are low-lying |
Question 7
Which structure of the moss protects the embryo from dryingout?
Question 7 options:
the archegonium | |
the antheridium | |
the sporangium | |
the stalk |
Question 8
Cooksonia were the first __________ plants; they hadwind-blown spores, __________, leaves, and roots.
Question 8 options:
nonvascular; branches | |
vascular; seeds | |
nonvascular; seeds | |
vascular; branches |
Question 9
The roots of today's lycophytes are much like __________ were inearly vascular plants; the vascular tissue is __________.
Question 9 options:
roots; centrally placed | |
stems; centrally placed | |
leaves; only found at the perimeter | |
branches; only found at the perimeter |
Question 10
Pteridophytes, or ferns and their allies, are __________vascular plants with __________.
Question 10 options:
seed-producing; microphylls | |
seedless; microphylls | |
seedless; megaphylls | |
seed-producing; megaphylls |
Question 11
Microphylls __________. Megaphylls__________.
Question 11 options:
are found in all vascular plants; are only found in thelycophytes | |
are broad leaves with a single strand of vascular tissue; arenarrow and have several strands vascular tissue | |
are broad leaves with several strands of vascular tissue; arenarrow and have a single strand of vascular tissue | |
are narrow and have a single strand of vascular tissue; arebroad leaves with several strands of vascular tissue |
Question 12
The fern life cycle
Question 12 options:
all of these choices accurately describe the fern lifecycle. | |
is dependent on external water. | |
relies on the wind to disperse the spores. | |
produces a gametophyte that lacks vascular tissue. |
Question 13
Seed plants use meiosis to produce
Question 13 options:
spores and pollen. | |
seeds and fruit. | |
pollen and seeds. | |
microspores and megaspores. |
Question 14
In seed plants, a microspore develops into
Question 14 options:
an egg. | |
a pollen grain. | |
a sporophyte. | |
All of these answers correctly complete this sentence. |
Question 15
Within the angiosperms, or ___________, two groups exist. Theyare named for their __________.
Question 15 options:
vascular plants; number of cotyledons, or seed coats | |
nonvascular plants; leaf type | |
flowering plants; number of cotyledons, or seed coats | |
fungi; leaf type |
Question 16
The __________ parts of a flower are the stamens, each of whichhas two parts: the anther and the filament. The __________ parts ofa flower are the carpel, which has three major regions: the stigma,the style, and the __________.
Question 16 options:
female; male; ovary | |
male; female; sepals | |
female; male; sepals | |
male; female; ovary |
Question 17
Double fertilization during the angiosperm life cycle involvestwo sperm, one of which __________, while the other __________.
Question 17 options:
fertilizes the egg to form a zygote; produces the endospermnucleus, which will develop into food for the developing plant | |
is a mature male gametophyte; is an immature malegametophyte | |
lands on the carpel of the plant; is usually blown away in thewind | |
develops into the seed; develops into the fruit that surroundsthe seeds |
Question 18
The bodies of most fungi are made up of a network of filamentscalled hyphae.
Question 18 options:
True | |
False |
Question 19
What is the difference between land fungi and the chytrids?
Question 19 options:
Land fungi are motile and have flagella at all stages of theirlife cycle. The chytrids do not have flagella. | |
Land fungi are nonmotile and do not have flagella at any stageof their life cycle. The chytrids have flagellated spores andgametes. | |
Land fungi are nonmotile and only have flagellated spores. Thechytrids have flagellated spores and gametes. | |
Both are motile for part of their life cycle. Land fungi aremotile as gametes. Chytrids are motile as spores. |
Question 20
The vast majority of described species of fungi are __________fungi, which include unicellular __________, which reproducesexually once their food supply runs out. When yeast ferment, theyproduce ethanol and carbon dioxide.
Question 20 options:
zygospore; black bread molds | |
club; mushroom | |
sac; yeast | |
mutualistic; lichen |
