File:
<mycoexam2.htm> <Index to Mycology> Pooled References <Glossary> Site
Description <Navigate to
Home>
|
EXAMINATION
& EXERCIZES #1 For The SCHIZOMYCOPHYTA, AMOEBOZOA & ZYGOMYCOTA (Contact)
_ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ 1. Assign each of the
following genera to its proper kingdom and order: Absidia = ______________________________________________ Achlya = ______________________________________________ Albugo = ______________________________________________ Allomyces =
____________________________________________ Aphanomyces =
_________________________________________ Basidiobolus =
_________________________________________ Basidiophora = _________________________________________ Circinella = ____________________________________________ Myzocytium = ___________________________________________ Physoderma =
___________________________________________ Phytophthora =
__________________________________________ Podochytrium =
__________________________________________ 2.
For each of the entries in the column at the left select from the
column at the right the one genus that best fits that
item, and enter the number of the selected organism in the appropriate
blank:
3. Classify the
following genera:
4.
Which of the following genera are comparable in that a single oosphere
is differentiated in the oogonium, with periplasm around it: Aphanomyces Achlya
Pythium Albugo Peronospora Monoblepharis Phytophthora Allomyces Bremia 5.
In the subclass Biflagellatae of the Zygomycota underline which of the
following apply: No
forms are holocarpic Zoospores
may be facultative gametes. All
flagellated cells are zoospores. Gametic
union usually occurs within the thallus. All
species are confined to aquatic habitats. Fertilization
tubes are of common occurrence. Detachable
zoosporangia re found in some genera. No
forms are obligately parasitic. 6.
The peculiar elongated sporangia of Syncephalis are called
________________________. 7.
Underline the correct statement:
The conidiophores of the Downy Mildews are (determinate)
(indeterminate) In growth. (All) (Most) (No) downy mildew
fungi are obligate parasites. If the
conidium of a downy mildew germinates by production of zoospores, this is known as
(direct) (indirect)
germination. Diplanetism (is) (is not) encountered in downy mildews. Fill in the blanks: Four
genera of Downy Mildews are: _____________________, ____________________, _____________________, _____________________, 8. Underline the correct genus: Delimitation and/or maturation of
zoospores in a "vesicle" is typical of (Peronospora) (Pythium) (Aphanomyces) (Saprolegnia) (Lagenidium) (Phytophthora). 9. In the genus _________________ of the
Mucorales, Sporangiophores are typically borne on the stolon arch and zygospores are surrounded by
appendages growing from one or both suspensors. 10.
Underline the correct statement:
Sporangiola are found in (Thamnidium) (Pilobolus) (Circinella). These are (few-spored)
(many-spored) (commonly
detachable) sporangia (with) (without)
a columella. 11.
Underline the correct statement:
The fact that the conidia of Peronospora are not known to
germinate by the
formation of zoospores indicates that this is (a primitive) (an advanced) genus in
the Peronosporaceae. 12.
Fungi that produce zygospores
(may also produce) (never
produce) zoospores. 13.
Underline the correct statement:
The genera of the Peronosporaceae are separated mainly on the basis of (the number of oospores per oogonium) (the form of the conidiophores) (the size and shape of conidia) (the type or pattern of sculpturing on the oospore
wall). 14.
Underline the correct statement:
Aphanomyces and Allomyces (are) (are not) closel-related members of the
Zygomycota. (They belong) (They do not belong) to the same subclass. For
the following fill in the blanks or underline the correct statements: 15.
Species of the genus Entomophthora (can) (cannot) be grown in vitro on agar
media. 16.
A rot of sweet potatoes, apples, etc. is incited by (Mucor) (Syzygites) (Rhizopus) (Basidiophora). 17.
Forcible discharge of conidia is a feature of (all) (a few)
(most) members of the Entomophthorales. 18.
A cottony, slightly yellow growth of mold was noted on a gill fungus
in the forest. No vegetative
reproductive
structures could be found on close examination, but many large
zygospores were present and these were borne
between suspensors attached to coarse yellow zygophores. The observations indicate that the mold
was
______________________. 19.
"Damping Off" diseases are regularly incited by
soil-inhabiting species of the genus ______________ of the
Zygomycota. 20.
(All) (Most) true fungi that produce zoospores are members
of the Zygomycota. 21.
Columellate sporangia may be found in the following genera of the
Mucorales: ____________________, ____________________,
____________________,
____________________. 22. Two Zygomycota fungi that typically grow
on dung are _________________, and __________________. Such "dung-inhabiting"
forms are technically known as __________________________. 23.
A certain Zygomycota fungus has the following characteristics: A. It is
aquatic. B. It has a branching coenocytic mycelium,
the hyphae of which usually have regularly arranged vacuoles.
C. it produces clavate,
non-detachable zoosporangia. D. From the male gametangium small flagellated male gametes called
"antherozoids" are released into the water where the fungus is
growing. E. an
antherozoid enters the female gametangium to unite thee with a large
non-motile egg. This fungus belongs to the order __________________________
in the subclass _____________________ of the Zygomycota. 24.
The sporangiophores of (Phycomyces) (Circinella) (Plasmopara) (Pilobolus) (Albugo) are strongly
phototropic. 25.
The Mucorales (are) (are
not) prominently represented in the
fungal flora of the soil. 26.
Heterothallism in the Mucorales was discovered by (Harper)
(Thaxter) (Blakeslee) (Millardet) (de Bary) about (1850)
(1875) (1900) (1925). 27.
Stolons are produced in the following genera of the Mucorales: (Cunninghamella) (Circinella) (Absidia) (Syzgites)
(Pilobolus) (Rhizopus) (Mucor). 28.
Downy mildew fungi all form haustoria. One of the largest haustoria is produced by what species?
________. 29.
In the Entomophthorales most species of the genera ________________
and _________________ are parasitic on insects. Two
members of the Entomophthorales that do not parasitize insects are
____________________ and _____________________. 30.
In a homothallic Mucorales such as Syzgites a culture grown
from a single sporangiospore (might be expected to)
(would not be expected to) form zygospores. 26.
The Mucorales (are) (are not) prominently represented among
the soil fungal inhabitants. 27.
Heterothallism in Mucorales was discovered by (Thaxter) (Blakeslee) (deBary) about (1875) (1905)
(1925). 28.
Phytophthora infestans belongs to the family
___________________ in the order ____________________. It
(is) (is not)
an obligate parasite. It incites a
disease of _____________________ known as ______________. Conidiophores of P. infestans are of (determinate) (indeterminate) growth and (are unbranched) (branch dichotomously) (branch monopodially). 29.
In Albugo candida the mature oospore is (uninucleate) (multinucleate). When an oospore of A. candida germinates (a
short conidiophore emerges) (mycelium
grows out) (The endospore wall layer
forms a vesicle) (zoospores are released) 30.
In a homothallic mucor such as Syzygites a culture grown from a
single sporangiospore (might be
expected to) (would not be expected to) form zygospores. 31.
Fungi that produce zygospores
(may also produce) (never
produce) zoospores. 32.
Massospora belongs to the order __________________ in the
Sub-class ______________________ of the Zygomycota. The
conidia of this fungus (are) (are not) forcibly discharged. Two other genera belonging to the same order
are _________________________ and
_______________________. 33.
Some species of all species of the following genera are
coprophilous: (Pythium) (Basidiophora) (Basidiobolus) (Mucor)
(Syncephalis) (Pilobolus) (Completoria). 34.
Sporangiola are found in (Thamnidium) (Pilobolus) (Absidia). These are
(few-spored) (many-spored) (usually detachable)
sporangia (with) (without) a columella. 35.
The sporangiophores of (Circinella) (Phycomyces) (Pilobolus) (Plasmopara) (Albugo) are strongly phototropic. 36.
The fact that the conidia of Peronospora apparently never
germinate by formation of zoospores indicates that it is (an
advanced) (a primitive) genus in the
Peronosporaceae. 37.
The haustoria of Plasmopara
viticola are (smaller) (larger) than those of Peronospora
parasitica. 38.
Cunninghamella
(is) (is not) regarded as one of the most advanced
genera in the Mucorales. 39.
Delimitation and/or maturation of zoospores in a vesicle extruded from
the sporangium is typical of (Peronospora)
(Pythium) (Saprolegnia) (Albugo) (Lagenidium) (Phytophthora) (Aphanomyces). 40.
Allomyces and Aphanomyces (are) (are not) closely-related genera of the
Zygomycota. (They belong) (They do not belong)
to the same Sub-class. 41.
Members of the genus Entomophthora (can) (cannot) be grown
in vitro on agar media. 42.
Oospores occur in the following:
(Allomyces)
(Leptomitales) (Aphanomyces) (Pythium) (Urophlyctis) (Sporodinia) (Basidiophora) (Saprolegniales) (Zygomycetes) (Phytophthora). 43.
The peculiar elongated sporangia of Syncephalis are called
_____________________. 44.
In the genus _____________________ sporangiophores are typically borne
on the stolon arch and zygospores are surrounded by appendages growing from suspensors. 45.
The sporangium of Saprolegnia is considered to be homologous
with (the conidiophore) (the conidium) (a zoospore) (a
germ tube) of Albugo. In Saprolegnia there is (lateral) (internal) (no) proliferation of the sporangia.
Diplanetism (is
encountered) (is not encountered) in this water mold. 46.
The genera of the Peronosporaceae are separated mainly on the basis
of (number of oospores per oogonium) (form of the conidiophores) (size and shape of conidia)
(type of sculpturing on the oospore). 47.
Stolons are produced in the following genera of the Mucorales: (Phycomyces) (Mucor) (Rhizopus) (Pilobolus) (Sporodinia) (Absidia) (Circinella) (Cunninghamella). 48.
Catenulate conidia are produced in
(Phytophthora) (Pythium) (Albugo). 49.
Conidiophores of the Downy Muldews are (determinate)
(indeterminate) in growth.
Four genera of Downy Mildews are
_______________,
_________________,
_______________,
_________________. (All) (Most)
(No) downy mildew fungi are
obligate parasites. If the conidium
of a downy mildew germinates by production of zoospores, this is called (direct)
(indirect) germination. In the
downy mildews the zoospores have (one flagellum)
(two flagella). 50.
The following genera are similar in that a single oosphere is
differentiated in the oogonium with periplasm present around this oosphere: (Aphanomyces)
(Achlya) (Sapromyces) (Albugo) (Peronospora) (Pythium) (Monoblepharia)
(Allomyces). 51.
In the Biflagellatae subClass of the Zygomycota, (plasmogamy always occurs within the
fungus thallus) (fertilization tubes are of common occurrence) (no forms are holocarpic) (zoospores may be facultative gametes)
(detachable zoosporangia are found in some genera) (all species are confined to aquatic
habitats). 52.
Assign each of the following genera to its proper order:
53.
For each of the entries in the left column select from the column at
the right the one fungus that best fits that entry, and enter the number of the selected organism in
the appropriate blank.
54. Classify the
following genera:
55. A particular
Zygomycota fungus has the following characteristics: a. it is
aquatic, b. it has a branching
coenocytic mycelium, the hyphae of which usually have regularly arranged
vacuoles, c. it produces clavate,
non-detachable zoosporangia, d. from
the male gametangium small flagellated male gametes, called
"antherozoids" are released into the water where the fungus gorws,
e. an antherozoid enters the female
gametangium to unite there with a large non-motile egg. This fungus might be ___________________________ or
________________________________, but belongs to the order ____________________________ in
the Subclass __________________________. |