BIO 123 Exam 2
Which of the following traits was most important in enabling the first plants to move onto
land? - answer Development of sporopollenin to prevent dessication of zygotes
Characteristic shared by algae and seed plants - answer Chloroplasts
Which group of organisms should feature mitosis most similar to that of land plants? -
answer Charophytes
Some green algae exhibit alternation of generations. All land plants exhibit alternation of
generations. No charophytes exhibit alternation of generations. Keeping in mind the
recent evidence from molecular systematics, the correct interpretation of these
observations is that - answerPlants evolved alternation of generations independently of
green algae
Which of the following should have had gene sequences most similar to the charophyte
that was the common ancestor of the land plants? - answerEarly bryophytes
Big Bend National Park in Texas is mostly Chihuahuan desert, where rainfall averages
about 10 inches per year. Yet, it is not uncommon when hiking in this bone-dry desert to
encounter mosses and ferns. One such plant is called "flower of stone." It is not a
flowering plant, nor does it produce seeds. Under arid conditions, its leaflike structures
curl up. However, when it rains, it unfurls its leaves, which form a bright green rosette
on the desert floor. Consequently, it is sometimes called the "resurrection plant." At first
glance, it could be a fern, a true moss, or a spike moss.
What feature of both true mosses and ferns makes it most surprising that they can
survive for many generations in dry deserts? - answerFlagellated sperm
Which of the following characteristics is (are) possessed in common by true mosses,
ferns, and spike mosses, and therefore becomes useless at helping to determine to
which of these groups flower of stone belongs?
1. a sporophyte generation that is dominant
2. true leaves and roots
3. flagellated sperm
4. strobili
5. alternation of generations - answerFlagellated sperm & alternation of generations
Life cycle of mosses - answer1) Mature sporophytes produce haploid spores, dispersed
by wind.
2) Separate spores develop into female and male gametophytes.
, 3) Haploid eggs form in archegonia, and haploid sperm form in antheridia
4) Haploid gametes undergo fertilization, forming a diploid zygote
5) Diploid zygote develops into a sporophyte
In moss, _____ produce sperm. - answerAntheridia
The sperm produced by mosses require _____ to reach an archegonium. -
answerMoisture
In the moss life cycle _____ cells within a sporangium undergo _____ to produce _____
spores. - answerDiploid, meiosis, haploid
In mosses gametes are produced by _____; in ferns gametes are produced by _____. -
answerMitosis, mitosis
In seedless plants, a fertilized egg will develop into _____. - answerA sporophyte
The diploid generation of the plant life cycle always _____. - answerProduces spores
Beginning with the germination of a moss spore, what is the sequence of structures that
develop after germination?
1. embryo
2. gametes
3. sporophyte
4. protonema
5. gametophore - answerProtonema, gametophore, gametes, embryo, sporophyte
At some time during their existence, bryophytes may feature - answerSporangia
In plants, which of the following are produced by meiosis? - answerHaploid spores
Where do fern antheridia develop? - answerOn the underside of the gametophyte
The conspicuous part of a fern plant is a - answerdiploid sporophyte
Most bryophytes, such as mosses, differ from all other plants in that they _____. -
answerLack true leaves & roots
In contrast to bryophytes, in vascular plants the dominant stage of the life cycle is the
_____. - answersporophyte
What evolutionary development allowed plants to grow tall? - answerLignified vascular
tissue
Which of the following traits was most important in enabling the first plants to move onto
land? - answer Development of sporopollenin to prevent dessication of zygotes
Characteristic shared by algae and seed plants - answer Chloroplasts
Which group of organisms should feature mitosis most similar to that of land plants? -
answer Charophytes
Some green algae exhibit alternation of generations. All land plants exhibit alternation of
generations. No charophytes exhibit alternation of generations. Keeping in mind the
recent evidence from molecular systematics, the correct interpretation of these
observations is that - answerPlants evolved alternation of generations independently of
green algae
Which of the following should have had gene sequences most similar to the charophyte
that was the common ancestor of the land plants? - answerEarly bryophytes
Big Bend National Park in Texas is mostly Chihuahuan desert, where rainfall averages
about 10 inches per year. Yet, it is not uncommon when hiking in this bone-dry desert to
encounter mosses and ferns. One such plant is called "flower of stone." It is not a
flowering plant, nor does it produce seeds. Under arid conditions, its leaflike structures
curl up. However, when it rains, it unfurls its leaves, which form a bright green rosette
on the desert floor. Consequently, it is sometimes called the "resurrection plant." At first
glance, it could be a fern, a true moss, or a spike moss.
What feature of both true mosses and ferns makes it most surprising that they can
survive for many generations in dry deserts? - answerFlagellated sperm
Which of the following characteristics is (are) possessed in common by true mosses,
ferns, and spike mosses, and therefore becomes useless at helping to determine to
which of these groups flower of stone belongs?
1. a sporophyte generation that is dominant
2. true leaves and roots
3. flagellated sperm
4. strobili
5. alternation of generations - answerFlagellated sperm & alternation of generations
Life cycle of mosses - answer1) Mature sporophytes produce haploid spores, dispersed
by wind.
2) Separate spores develop into female and male gametophytes.
, 3) Haploid eggs form in archegonia, and haploid sperm form in antheridia
4) Haploid gametes undergo fertilization, forming a diploid zygote
5) Diploid zygote develops into a sporophyte
In moss, _____ produce sperm. - answerAntheridia
The sperm produced by mosses require _____ to reach an archegonium. -
answerMoisture
In the moss life cycle _____ cells within a sporangium undergo _____ to produce _____
spores. - answerDiploid, meiosis, haploid
In mosses gametes are produced by _____; in ferns gametes are produced by _____. -
answerMitosis, mitosis
In seedless plants, a fertilized egg will develop into _____. - answerA sporophyte
The diploid generation of the plant life cycle always _____. - answerProduces spores
Beginning with the germination of a moss spore, what is the sequence of structures that
develop after germination?
1. embryo
2. gametes
3. sporophyte
4. protonema
5. gametophore - answerProtonema, gametophore, gametes, embryo, sporophyte
At some time during their existence, bryophytes may feature - answerSporangia
In plants, which of the following are produced by meiosis? - answerHaploid spores
Where do fern antheridia develop? - answerOn the underside of the gametophyte
The conspicuous part of a fern plant is a - answerdiploid sporophyte
Most bryophytes, such as mosses, differ from all other plants in that they _____. -
answerLack true leaves & roots
In contrast to bryophytes, in vascular plants the dominant stage of the life cycle is the
_____. - answersporophyte
What evolutionary development allowed plants to grow tall? - answerLignified vascular
tissue
