Plant Diversity Chapter 33 Exam Questions and Verified Answers Latest Update (100% Pass)
True or False:
Angiosperms make up approximately 90% of all plant species found today. - Answers True
There are thought to be nearly 400,000 species of plants living today, approx. 90% are angiosperms...
Angiosperms make up approximately 90% of all plant species found today. - Answers True
There are thought to be nearly 400,000 species of plants living today, approx. 90% are angiosperms and
the other 10% of plant species are distributed among the other 6 major groups of plants
Describe Sphagnum moss - Answers Sphagnum moss is the dominant plant of peat bogs. Sphagnum
moss produces water-holding cells that allow it to soak up water, and it acidifies the environment. Both
characteristics help slow decomposition, so large amounts of organic carbon build up year after year.
True or False:
Bryophytes form persistent, photosynthetic gametophytes and small, unbranched sporophytes; today,
they grow in environments where the ability to pull water from the soil does not provide an advantage. -
Answers True
What 3 paraphyletic groups make up bryophytes? - Answers Mosses, liverworts and hornworts.
Describe bryophtes - Answers Bryophytes are small plants that produce one of two morphological types:
a flattened thallus or an upright leafy type. They do not form roots, but instead absorb water through
their surfaces.
True or False
Eudicots are the most diverse group of angiosperms. - Answers True
Explain the impact the lack of vascular cambium has on monocot plants - Answers The lack of a vascular
cambium has a profound impact on the way monocots form roots. Because individual roots cannot
increase their vascular capacity, monocots continuously initiate new roots from their stems. Thus, the
root systems of monocots are more similar to those found in ferns and lycophytes than in other seed
plants.
What are some of the distinctive features of monocots? - Answers Monocots produce only a single
cotyledon; monocot roots are produced continuously directly from the stem; many monocots produce
creeping stems; and the strap-shaped leaves of many monocots elongate from a zone of cell division
, located at the base of the leaf, which surrounds the stem to form a sheath. Monocots do not form a
vascular cambium; instead, radial growth occurs in a narrow zone just below the shoot apical meristem.
In most monocot stems, the vascular bundles are distributed throughout the cross section, as opposed
to being arranged in a ring.
Why are monocots named monocots? - Answers Monocots take their name from the fact that they have
one embryonic seed leaf, or cotyledon, whereas all other angiosperms have two.
True or False:
Spore-dispersing vascular plants today are primarily large plants that grow in moist environments, but in
the past included small trees. - Answers False
Spore-dispersing vascular plants today are primarily small plants that grow in moist environments, but in
the past included tall trees.
Are ferns and horsetails morphologically diverse? - Answers Yes. Ferns produce large leaves that uncoil
as they grow; horsetails have tiny leaves; and whisk ferns with no leaves at all.
True or False:
Gymnosperms produce spores and woody stems and are not common in seasonally cool or dry regions. -
Answers False
Gymnosperms produce seeds and woody stems and are most common in seasonally cool or dry regions.
What 2 types of seed plants can be found today? - Answers The Gymnosperms, with fewer than 1000
species, and the Angiosperms, with more than 380,000 species.
Where might have angiosperms orginated? - Answers In the shady understory of tropical forests.
Double fertilization evolved independently in gnetophytes and in flowering plants. Name two other
features usually associated with angiosperms that evolved independently in gymnosperms. - Answers
Xylem vessels evolved convergently in gnetophytes and angiosperms; insect pollination evolved
convergently in cycads and angiosperms; fleshy tissues to facilitate seed dispersal evolved convergently
in early seed plants (reflected today in ginkgo and cycad seeds), conifers such as juniper and yew, and
flowering plants.
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