CH. 27 BIO
What is the structure labeled as A in the accompanying figure?
gametangium of an alga
What is the structure labeled as 1 in the accompanying figure?
gamete
Heterospory is believed to have led to the evolution of:
seeds
Refer to the accompanying figure. At what point of this life cycle does fertilization occur? (diagram)
4
Refer to the accompanying figure. At what point is there potential to undergo mitosis to become a gametophyte? (diagram)
9
Each archegonium produces many eggs.
False - a single egg
If a plant produces microspores and megaspores, then by definition, it is homosporous.
False - heterosporous
Mosses have stems, roots, and leaves.
False - lack, do not have
Xylem is a vascular tissue that conducts dissolved sugars. ___
False - water and dissolved minerals
What is the purpose of the waxy cuticle in plants?
It prevents desiccation.
Which is the most economically important bryophyte?
Sphagnum
Why are mosses and liverworts limited in size?
They lack vascular tissues.
Modern botanists think that all plants evolved from a common ancestor that was an ancient green algae. What is the best explanation for this hypothesis?
They share many biochemical and metabolic traits.
In algae, gametangia are generally unicellular.
True
What is the male sexual structure that produces sperm in plants?
antheridium
Plants are believed to have evolved from which group of algae?
charophytes
Which is a characteristic shared between green algae and plants?
chlorophylls a and b in plastids
Alternation of generations in plants refers to the alternation of:
diploid and haploid stages.
The leafy fern that you might have as a house plant is the ____ generation.
diploid sporophyte
In plants, the fertilized egg develops into a multicellular ____ (young plant) within a female gametangium.
embryo
Which of the following is a vascular plant?
fern
The sori of most ferns are found on which part of the plant?
fronds
What are the multicellular sex organs in plants?
gametangia
The ____ generation is dominant in mosses, as it can live independently.
haploid gametophyte
The structure in the accompanying figure labeled as 4 is: (diagram)
haploid.
Many seedless plants produce spores of one morphological type, which is referred to as:
homospory.
A key step in the evolution of vascular plants was the ability to produce ____, a strengthening polymer in the walls of cells that function for support and conduction
lignin
The oldest known fossils suggest that the ____ may have been the first plants to inhabit land.
liverworts
The gametophyte generation of ferns is the:
prothallus.
When a moss spore lands in a suitable spot, it germinates and grows into a filament of cells called a:
protonema.
What do ferns lack?
seeds
After sexual reproduction in a moss, the ____ grows out of the gametophyte.
sporophyte
Which vascular tissue is responsible for conducting water and dissolved minerals in plants?
xylem