Download Exam 3 Answers

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BOT 105
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P LANT B IOLOGY
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Summer Term 2002
Exam 3
1. Label Gametophyte and Sporophyte portions of the following diagrams.
A __Sporophyte___________
B __Gametophyte_________
C __Gametophyte_________
D __Sporophyte___________
E ___Gametophyte_________
F ___Sporophyte__________
2. Name 2 developments that led to the success of non-algae plants on land.
Stomata, Root / shoot systems, true leaves, seeds, Vascular tissue, seed dormancy,
spores with sporopollenin, lignin, tissue specialization, ability to dry out
Extra Credit: Name 2 reasons why it is believed that land plants arose from green algae.
Similar reproductive pattern, pigments, cell walls, cell division.
3. Name the Genera of Seedless Vascular plants which bears its leaves in a whorl, has a hollow
stem, is homosporangiate, topped with a terminal strobilus with sporangiophores, and whose
body is impregnated with silica.
a. Psilotum (Whisk Fern)
b. Lycopodium (Club Moss)
c. Isoetes (Quillwort)
d. Selaginella (Resurrection Plant)
e. Equisetum (Horsetails, Scouring rush)
4. Discuss the difference between the Homosporus and Heterosporus conditions.
Homosporus plants make gametophytes that are bisexual (have both archegonia
and antheridia.
Heterosporus plants make gametophytes that are either male (with antheridia) or
female (with archegonia).
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5. A structure of Sporophylls densely arranged on a central axis
a. Sporangia
b. Club Moss
c. Strobilius
d. Moss gametophyte
6. Most Ferns are
a. Homosporus and Eusporangiate.
b. Homosporus and Leptosporangiate.
c. Heterosporus and Eusporangiate.
d. Heterosporus and Leptosporangiate.
7. Sori are
a. masses of Leptosporangiate Sporangia.
b. found on the upper surface of Fertile Leaves.
c. found on gametophytes.
d. either covered (indusia) or naked.
e. special type of Fern Sporangia.
f. a and c
g. a, and d
8. Label the Seed diagram by matching the appropriate letter with the possible answer choices
below. (Quarter of a point of Extra Credit will be awarded for every tissue for which the
correct Ploidy Number is named.)
__B__ Seed Coat _2N__
__A__ Microphyle __2N __
__F__ Embryo __2N __
__D__ Cotyledons _2N ___
__G__ Apical Meristem __2N ___
__E__ Radicle __2N ___
__C__ Endosperm ___3N __
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BOT 105
9. Mature Male Gametophyte in Seed plants
a. is a pollen grain.
b. never leaves the sporangium.
c. has 3 nuclei.
d. is still flagellated in most genera.
10. In Gymnosperms, the megasporangium becomes the _________________ when the egg is
fertilized.
a. Seed
b. Nucellus
c. Tapetum
d. Endosperm
e. Seed coat
f. Integument
11. Fill in the table with the correct Phyllum
Trait
Coniferophyta Cycadophyta Ginkgophyta
“Gender”
Monoecious
Leaf Type
Fertilization
Mode
Cone Types
Needle or Scale like
Pollen tube
Special
Dioecious
Dioecious
Fern or Palm like
Fan-like
Pollen tube then
Pollen tube then
Flagellated Sperm Flagellated Sperm
Compound ♀,
Both Simple
Fleshly ♀ Cone,
Simple ♂ Cone
Cones
Simple Male
Leaves bunched into Mistaken for Palm One species left in
Facicles
trees
this phylum
Gnetophyta
Dioecious
Various
Pollen tube
Both Compound
Cones
Related to
ancestors of
Angiosperms
12. The following are traits of the Gnetophyta which are Angiosperm-like except:
a. Animal pollinated and/or dispersed
b. Synecious cones
c. Double fertilization
d. Advanced vascular tissue
e. Inflorescence-like branching in cone bearing structures.
In the next 2 questions (13 and 14), fill in the blank with either Primitive or Advanced.
13. A flower with fused carpels and an inferior ovary is more _Advanced_ than a flower with free
carpels and a superior ovary.
14. A flower with no petals or sepals is more ___Advanced__ than a flower with petals and sepals.
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Name: ___________________Key________________
BOT 105
15. Name 4 differences between Monocots and Dicots
Character
Monocots
Dicots
Vascular Bundle arrangement
Secondary growth
Floral members
Stomata
Vein arrangement
Cotyledon #
Random
Not possible
3
4 celled
parallel
1
In a ring
Possible
4,5
2 celled
netted
2
Extra Credit: Name the force driving Floral Evolution.
Mutualism with animals for pollination
16. A seed may be prevented from germinating in all cases except:
a. Conditions which are too dry
b. Relatively high amounts of Abscissic Acid (ABA)
c. Relatively high amounts of Giberillic Acid (GA)
d. Conditions which are too cool
17. The tissues of vascular plants are considered to fall into these basic types:
a. vascular and non-vascular
b. above ground and below ground
c. stem, root, and leaves
d. ground, vascular, and dermal
18. Label the following Root Diagram using terms from this word box.
A ___Stele__________
B ___Phloem________
C ___Epidermis______
D ___Cortex_________
E ____Xylem_________
F ____Endodermis___
Cortex
Endodermis
Epidermis
Lignin
Periderm
Phloem
Pith
Ray
Stele
Xylem
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BOT 105
19. The Endodermis waterproofs the Stele of a Root using which of the following compounds?
a. Casparian Strip
b. Subrin wax layer
c. Secondary walls with lignin
d. All of the above
20. Name the organ of origin for each of the following:
Tuber: __________Root_______
Rhizome: ________Stem_______
Spine: ___________Leaf___________
Prickle: __________hair___________
Corm: ___________Stem___________
Pneumatophore: ___Root___________
21. Which of the following hormones encourages Root Growth?
a. Auxin
b. Abscissic Acid (ABA)
c. Ethylene
d. Cytokinins
e. Gibberillic Acid (GA)
22. What 2 conditions describe a Vascular Bundle that is closed?
Lack of Vascular Cambium
Surrounded by Sclerenchyma
Scattered arrangement in the stem
23. The presence of _______________ allows Secondary Growth.
a. Procambium
b. Sclerenchyma
c. Vascular cambium
d. Both Xylem and Phloem
24. Name a leaf modification and state its purpose.
Various responses
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25. Hormones are:
a. compounds that create a physiological response in small quantities
b. compounds produce a physiological response when expressed in large quantities
c. cells that produce a physiological response
26. Name the Hormone that is associated with each of the following groups of effects:
____Auxin_______ Apical dominance, phototropism, and cell expansion
____ABA________ Stomatal Closure, and dormancy in seeds and buds
____GA_________
Bolting (increasing internode length), and breaking dormancy
____Ethylene_____ Senescence, fruit ripening, and triple response of seedlings
____Cytokinin____ Delays senescence, and induces cell division
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