95 - ____ = ____ / _____ = ______
Biology 332
Spring 2000

Exam III "Non-Vascular" Plants

Name___________________

Clearly Cyanophyta. 15 points

Describe the nucleus of the cell: none

Name, in sequence, the stages of mitosis: none, they undergo fission!

What kind of cytokinesis is found? furrowing

Name any peculiar antenna pigments for photosynthesis: phycobilins

Describe the chloroplast of these organisms: none, thylakoids in cytosol

What is the storage product for photosynthate? cyanophycean starch, oils

What non-photosynthetic product is stored in the cell? polyphosphate

Name a cell specialized for enduring adverse conditions: akinete

Name a cell specialized to convert nitrogen gas into soluble form: heterocyst

Name the three forms of cellular organization in this group: unicellular, colonial, filamentous

Name two kinds of branching found in one form of cellular organization: true, false

How do these organisms produce new genotype combinations? conjugation, transformation

The Generalized Plant Life Cycle: 8 points

The product of meiosis in plants is always a spore

In plants, gametes are always produced by the process called mitosis

The act of union of egg and sperm nuclei is called syngamy

The product of the union of egg and sperm is called a zygote

The plant body which undergoes meiosis is called the sporophyte

The plant body which produces egg and sperm is called the gametophyte

A structure housing gametes is called a gametangium

The structure housing meiosis is called a sporangium


Covering Chlorophyta. 10 points

The wall material (if any) is: cellulose

The photosynthetic storage material is: starch

Which of the following is considered most apomorphic? isogamous     anisogamous     oogamous

Where crystalline Rubisco and starch are located in the chloroplast: pyrenoid

Name the four "forms" of cellular organization of green algae. unicellular, filamentous, colonial, parenchymatous

Which "form" of cellular organization above is plesiomorphic? unicellular

In the Volvocales what is the most-apomorphic "form"? colonial

One filamentous green alga is Oedogonium fantastica. It is heterothallic, vegetatively isomorphic, oogamous, and zygotic. A hypnozygote is formed. Meiotic products are motile and vegetative filaments can produce motile cells for propagation. Using this information, sketch and label the life cycle of Oedogonium fantastica below (be sure to show all "containers" and put haploids on the left side): 12 points

syngamy
egg +sperm
oogonium+ antheridium
two isomorphs
mito-zoospore
meio-zoospore
zygote
 
 
zygotic
 
 
sporocyte=hypnozygote
meiosis


Mostly Mosses: 28 points

What structural characteristic of moss spores is adaptive for terrestrial existence? sporopollenin in spore wall

What stage of the life history of a moss indicates an alga-like ancestor? protonema

List the fundamental parts of a moss gametophyte thallus: rhizoid, "leaf", "stem", antheridium, archegonium

In mosses, the vascular equivalent of xylem is hydroid

In mosses, the vascular equivalent of phloem is leptoid

The oogonium found in algae has evolved into the bryophyte's: archegonium
        which means that it has this new feature: sterile jacket

The antheridium found in algae has evolved into the bryophyte's: antheridium
        which means that it has this new feature: sterile jacket

The life cycle of bryophytes and vascular plants is: gametic     sporic    zygotic

The gametes of bryophytes and vascular plants are: isogamous     anisogamous     oogamous

The calyptra of a moss comes from the archegonium neck

List the three main parts of a bryophyte sporophyte: foot, seta or stalk, sporangium or capsule

In mosses, the sporophyte
    is a parasite on the gametophyte

The dominant generation in mosses is the gametophyte

You find a new species of moss. What do you expect is the ploidy level of the:
    leafy shoot? 1N    calyptra? 1N     capsule wall? 2N     spores? 1N

What critical biopolymer of the cells of a moss made life on land possible? cutin
    (hint: missing in algae!)

Lack of a synthesis for what critical biopolymer restricts moss to short stature? lignin


Liverwort Life Cycle: 22 points

In the space below, diagram the liverwort life cycle. Put the haploid phase on the left. Be sure to name the multicellular plant(s), any -angia they may have, the special cell(s) in the -angia, and the special cell(s) the plant came from. Be sure to name the processes that convert from one side to the other of this life cycle, and the cell(s) that participate in and result from these processes. Your diagrams should show both macroscopic and microscopic forms as needed to show the critical elements of each named stage. Of course everything needs to be labeled!

syngamy
egg +sperm
venter + neck
oogonium+ antheridium
 
gametophyte thallus + rhizoid
cupule/gemma
protonema
 
spore
1N       2N zygote
 
sporophyte
foot
stalk
sporangium
 
sporocyte
meiosis



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