BIOL 1108 Exam 3 Study Guide
UPDATED 2026 QUESTIONS AND
ANSWERS WITH COMPLETE
SOLUTIONS – YOUR ROAD TO
SUCCESS
What is the common starting point for all plant development?
✔✔ All plant tissues originate from meristematic cells.
What is the primary function of meristematic cells?
✔✔ These are the essential cells that plants utilize to facilitate growth and
development.
What is the developmental state of meristematic cells?
✔✔ These cells are considered undifferentiated, meaning they have not yet
developed a specific structure or specialized role.
How is the term "undifferentiated" defined in plant biology?
✔✔ It refers to cells that lack a dedicated function or unique physical
characteristics at the time of their formation.
What occurs when a meristem cell undergoes division?
✔✔ The resulting daughter cells possess the potential to transform into any
type of specialized plant tissue.
What are apical meristems and what do they accomplish?
,✔✔ Located at the tips or apexes of various plant structures, these cells are
responsible for primary growth, which increases the plant's length.
How does secondary growth differ from primary growth?
✔✔ Secondary growth involves the sideways or lateral activity of meristem
cells, causing the plant to increase in thickness or diameter.
Describe the key derived traits that promoted the evolution of land plants from a
green algal ancestor. -ANSWER✔✔multicellular, diploid, eukaryotic,
photosynthetic autotrophs, cell walls made of cellulose, chloroplasts with
chlorophylls, euglenids, protein rings in the plasma membrane, and a few
dinoflagellates
The charophytes are -ANSWER✔✔the only present-day algae that share certain
distinctive traits with plants, a fact that suggests that they are the closest living
relatives of plants
Plants have a -ANSWER✔✔multicellular haploid life stage that makes gametes
and a multicellular diploid life stage that makes spores
alternation of generations -ANSWER✔✔A life cycle in which there is both a
multicellular diploid form, the sporophyte, and a multicellular haploid form, the
gametophyte; characteristic of plants and some algae.
Bryophytes are -ANSWER✔✔monophyletic according to recent evidence.
Important to mention in the context of science not being static
Explain the major evolutionary transitions plants: including shifts in dominant life
stage, vascular tissue, seeds, flowers/fruit -ANSWER✔✔During the first 100
,million years of plant evolution, bryophytes were prominent members of the
vegetation. But it is vascular plants that dominate most landscapes today. The
earliest fossils of vascular plants date to 425 million years ago. These plants lacked
seeds but had well-developed vascular systems, an evolutionary novelty that set the
stage for plants to grow tall.
The rise of vascular plants was accompanied by other evolutionary changes as
well, resulting in life cycles with dominant sporophytes and the origin of well-
developed roots and leaves.
Charles Darwin once referred to the origin of angiosperms as an "abominable
mystery." He was particularly troubled by the relatively sudden and geographically
widespread appearance of angiosperms in the fossil record (about 100 million
years ago based on fossils known to Darwin). Recent fossil discoveries and
phylogenetic analyses have led to progress in solving Darwin's mystery, but we
still do not fully understand how angiosperms arose from earlier seed plants.
Angiosperms are thought to have originated in the early Cretaceous period, about
140 million years ago.
Bryophytes lack -ANSWER✔✔roots, leaves, and vascular tissue and have motile
sperm that require moisture to fertilize eggs and their dominant life stage is the
haploid gametophyte
Vascular plants have -ANSWER✔✔leaves, roots, and vascular tissue, and the
sporophyte is dominant
Vascular tissue transport -ANSWER✔✔water, minerals, and sugars to all parts of
the plant allowing sporophyte to grow tall which promotes further dispersal of
spores providing an evolutionary advantage
Seed evolves to -ANSWER✔✔promote further dispersal, protect the gametophyte
which becomes microscopic and retained by the sporophyte, includes nutrient
supply, helps prevent desiccation, and promotes dispersal by wind, animal, water
, Fruits and flowers further promote -ANSWER✔✔pollination and seed dispersal
and allow for specialization driving coevolutionary relationships between
angiosperms and pollinators/frugivores
Sporopollenin -ANSWER✔✔A durable polymer that covers exposed zygotes of
charophyte algae and forms the walls of plant spores, preventing them from drying
out.
Sporophyte -ANSWER✔✔The stage in the life cycle of a plant in which the plant
produces spores.
Spore -ANSWER✔✔microscopic propagative bodies, with a single nucleus, whose
primary function is plant dispersal and reproduction
Gametophyte -ANSWER✔✔The stage in the life cycle of a plant in which the
plant produces gametes, or sex cells.
Embryophytes -ANSWER✔✔Another name for land plants, recognizing that land
plants share the common derived trait of multicellular, dependent embryos.
embryo -ANSWER✔✔the developing human organism from about 2 weeks after
fertilization through the second month
Sporangia -ANSWER✔✔located on the tip of the mature sporophyte, where
meiosis occurs, producing haploid spores
UPDATED 2026 QUESTIONS AND
ANSWERS WITH COMPLETE
SOLUTIONS – YOUR ROAD TO
SUCCESS
What is the common starting point for all plant development?
✔✔ All plant tissues originate from meristematic cells.
What is the primary function of meristematic cells?
✔✔ These are the essential cells that plants utilize to facilitate growth and
development.
What is the developmental state of meristematic cells?
✔✔ These cells are considered undifferentiated, meaning they have not yet
developed a specific structure or specialized role.
How is the term "undifferentiated" defined in plant biology?
✔✔ It refers to cells that lack a dedicated function or unique physical
characteristics at the time of their formation.
What occurs when a meristem cell undergoes division?
✔✔ The resulting daughter cells possess the potential to transform into any
type of specialized plant tissue.
What are apical meristems and what do they accomplish?
,✔✔ Located at the tips or apexes of various plant structures, these cells are
responsible for primary growth, which increases the plant's length.
How does secondary growth differ from primary growth?
✔✔ Secondary growth involves the sideways or lateral activity of meristem
cells, causing the plant to increase in thickness or diameter.
Describe the key derived traits that promoted the evolution of land plants from a
green algal ancestor. -ANSWER✔✔multicellular, diploid, eukaryotic,
photosynthetic autotrophs, cell walls made of cellulose, chloroplasts with
chlorophylls, euglenids, protein rings in the plasma membrane, and a few
dinoflagellates
The charophytes are -ANSWER✔✔the only present-day algae that share certain
distinctive traits with plants, a fact that suggests that they are the closest living
relatives of plants
Plants have a -ANSWER✔✔multicellular haploid life stage that makes gametes
and a multicellular diploid life stage that makes spores
alternation of generations -ANSWER✔✔A life cycle in which there is both a
multicellular diploid form, the sporophyte, and a multicellular haploid form, the
gametophyte; characteristic of plants and some algae.
Bryophytes are -ANSWER✔✔monophyletic according to recent evidence.
Important to mention in the context of science not being static
Explain the major evolutionary transitions plants: including shifts in dominant life
stage, vascular tissue, seeds, flowers/fruit -ANSWER✔✔During the first 100
,million years of plant evolution, bryophytes were prominent members of the
vegetation. But it is vascular plants that dominate most landscapes today. The
earliest fossils of vascular plants date to 425 million years ago. These plants lacked
seeds but had well-developed vascular systems, an evolutionary novelty that set the
stage for plants to grow tall.
The rise of vascular plants was accompanied by other evolutionary changes as
well, resulting in life cycles with dominant sporophytes and the origin of well-
developed roots and leaves.
Charles Darwin once referred to the origin of angiosperms as an "abominable
mystery." He was particularly troubled by the relatively sudden and geographically
widespread appearance of angiosperms in the fossil record (about 100 million
years ago based on fossils known to Darwin). Recent fossil discoveries and
phylogenetic analyses have led to progress in solving Darwin's mystery, but we
still do not fully understand how angiosperms arose from earlier seed plants.
Angiosperms are thought to have originated in the early Cretaceous period, about
140 million years ago.
Bryophytes lack -ANSWER✔✔roots, leaves, and vascular tissue and have motile
sperm that require moisture to fertilize eggs and their dominant life stage is the
haploid gametophyte
Vascular plants have -ANSWER✔✔leaves, roots, and vascular tissue, and the
sporophyte is dominant
Vascular tissue transport -ANSWER✔✔water, minerals, and sugars to all parts of
the plant allowing sporophyte to grow tall which promotes further dispersal of
spores providing an evolutionary advantage
Seed evolves to -ANSWER✔✔promote further dispersal, protect the gametophyte
which becomes microscopic and retained by the sporophyte, includes nutrient
supply, helps prevent desiccation, and promotes dispersal by wind, animal, water
, Fruits and flowers further promote -ANSWER✔✔pollination and seed dispersal
and allow for specialization driving coevolutionary relationships between
angiosperms and pollinators/frugivores
Sporopollenin -ANSWER✔✔A durable polymer that covers exposed zygotes of
charophyte algae and forms the walls of plant spores, preventing them from drying
out.
Sporophyte -ANSWER✔✔The stage in the life cycle of a plant in which the plant
produces spores.
Spore -ANSWER✔✔microscopic propagative bodies, with a single nucleus, whose
primary function is plant dispersal and reproduction
Gametophyte -ANSWER✔✔The stage in the life cycle of a plant in which the
plant produces gametes, or sex cells.
Embryophytes -ANSWER✔✔Another name for land plants, recognizing that land
plants share the common derived trait of multicellular, dependent embryos.
embryo -ANSWER✔✔the developing human organism from about 2 weeks after
fertilization through the second month
Sporangia -ANSWER✔✔located on the tip of the mature sporophyte, where
meiosis occurs, producing haploid spores
