ORGANISMIC BIOLOGY 201 Exam 2, version 2, Oct. 6, 2000
Write your name and SSN on the answer sheets. Make sure that your SSN is correct. Mark the bubble granting me permission to post your grade otherwise, your grade will not appear on the wall. Read questions and answers carefully. Using a #2 pencil, fill in the little bubble on the answer key. You may keep these questions for future entertainment. I do, however, need your card and answer to the bonus questions.
MULTIPLE CHOICES
(3 pts each)
1. Synergids in a dicot embryo sac
This is a trick question: only gymnosperms have synergids
fuse with one of the sperm cells
participate in forming stored nutrition for the developing embryo
have no active role in the fertilization event
are placed in the end opposite to the micropyle
2. Gnetophyte and typical angiosperm fertilization are similar because
the tube cell nucleus fuses with the one of the nuclei in the ovule
gnetophytes like angiosperms have a triploid endosperm
both have similar egg-bearing apparatus
nuclei from the microgametophyte fuse with nuclei from the megagametophyte
the events are identical and involve two sperms cells that initiate homologous tissues
3. Apical meristems
produce the lateral growth in some monocotyledons
are never involved in lateral growth
are where the secondary phloem forms
responsible for the growth of a leaf blade
explain how conifers can live for millenia
4. Gymnosperms are
.
evergreen
deciduous
monoecious
diecious
gymnosperms vary; any of the above may apply
5. Angiosperms
may have several generations in a single seed
like gymnosperms have a haploid megasporangium
have a haploid nucellus like gymnosperms do
have no nucellus what so ever
as opposed to gymnosperms possess no microgametophyte
6. Paper is
mainly fiber
most usually wood
mainly xylem
products of secondary growth
all of the above
7. Domino-effect extinction means that
increasing popularity of domino game is threatening tropical rain forests
dodo-bird ate tambalacoque tree seed pushing the tree into extinction
extinction of one species puts another one to the brink of extinction
nobody plays domino any more
tambalacoque tree needs scarification prior to germination
8. Rhizosphere is
the region in soil that is affected by roots and their exudates
something that you encounter in mission to Mars
layer just above lithosphere
known also as biosphere
the layer just below lower atmosphere
9. Tendrils are
slender structures that plants use for twining and support
modified stems
modified leaves
sometimes photosynthetic
all of the above
10. In a bud in the tip of dicot stem or branch,
a) there is only single apical meristem because the stem has apical meristem
- there are several apical meristems because the leaves have an apical meristem too
- there are only leaf marginal meristems
- the bud is protected by a bud cap similar to root cap
- bud cap exudates protect the elongating stem young stem from the hazards of the environment
11. Welwitschia mirabilis is exceptional because
it is a gymnosperm and undergoes double fertilization and then aborts the second diploid cell
it is an angiosperm and does not have an endosperm
it produces foul-smelling fruit
it is a monocot and has secondary cortex
it is a gymnosperm and has photosynthetic stems
12. Carpel may have originated
from a folded leaf
from stamens
lateral meristems
rhizosphere
through meiosis
13. How many sperm cells are involved in fertilization in gymnosperms?
one
two
two; one that fertilizes the egg and another that fuses with the polar nuclei
always two, but the other one may disintegrate by the time of fertilization
none of the above; the egg engulfs the sperm cells
14. Plants talk!
Means that
Careful listener can hear plants broadcasting complex messages
Salix sitchensis (sitka willows), when attacked by ferocious pests, can send chemical signals to neighboring plants
Plants have an underground network of communication which involves sending electric signals
Through physical contact, plants can Morse code messages to their neighbors
Is what "Wind in the Willows" is all about.
15. Ceratophyllum
is an aquatic plant which may resemble the first flowering plants
is a plant that grows in cool, dry uplands in Europe
according to dogma, was the first divergence event within angiosperms
represents the monophyly of dicotyledons
is currently extinct
16. Auxin induced organ elongation
involves structural breaking of the cell wall or its components
involves accelerated cell divisions
involves breaking dormancy in the non-meristematic tissues
has a prerequisite interaction with ethylene
all of the above
17. Seed plants differ from other vascular plants because
they do not have flagellated sperm
spore dispersal from the sporophyte does not need water
next sporophyte generation can be dipersed independent of the female gametophyte
there is no haploid gametophyte generation
they are homosporous
18. Monocots and dicots can be identified by their roots because
monocots have only one cotyledon
the roots have different "fingerprints"
the arrangement of vascular bundles is usually different
monocots have a clearly identifiable lateral cambium
monocots frequently produce suckers
19. Abscisic acid is
the hormone involved in leaf abscission.
the hormone produced when shortage of water occurs.
a growth stimulant like auxin, cytokinins and gibberellins.
commercially available and used for crop synchronization by apple farmers.
all of the above.
20. Amyloplasts are
pigments causing the blue color in the root caps
pigments that reflect blue light
potentially the agent of gravitropism
vacuole confining membranes similar to tonoplasts
pigments with no apparent function what so ever
TRUE AND FALSE
(2 pts each)
21. Cork cambium produces xylem
towards the center of the plant.
TRUE FALSE
22. Secondary growth is typical to
dicotyledons and nonflowering seed plants. TRUE FALSE
23. Integuments give rise to
suberized cork. TRUE FALSE
24. In Polygonum-type embryo sac development the
megasporocyte goes through three mitotic divisions. TRUE FALSE
25. There is no alternation of generations in the
angiosperms. TRUE FALSE
26. The faster growth rate on the outer side of a young leaf causes
it to curl over the stem apical meristem to protect it TRUE FALSE
27. Tubers can be either modified stems
or modified roots TRUE FALSE
28. Secondary growth is the primary reason for
the annual length increment in tall trees TRUE FALSE
29. Hormonal growth regulation is exclusively
chemically induced TRUE FALSE
30. Bisporangiate and monoecious are synonymous. TRUE FALSE
31. Root cap meristem produced cells remain as
peripherial cells and eventually form epidermis. TRUE FALSE
32. Quiescent center is a minimally active root apex region that
provides replacement to damaged meristem cells. TRUE FALSE
33. Intercalary meristem is responsible for
stem elongation in conifers. TRUE FALSE
34. Abscisic acid pumps potassium into the guard
cells causing the stomata to open. TRUE FALSE
35. Stomata are kept open because of
turgor pressure.
TRUE FALSE
36. Auxin and ethylene are involved in
leaf abscission.
TRUE FALSE
37. Seeds disperse a diploid sporophyte generation.
TRUE FALSE
38. Three nuclei are necessary for a
mature angiosperm microgametophyte.
TRUE FALSE
39. Casparian strip is a layer of cells in
cortex just below epidermis.
TRUE FALSE
40. Casparian strip does not allow intracellular flow.
TRUE FALSE
ORGANISMIC BIOLOGY 201 Exam 2, Oct. 6, 2000
Name
_______________________ SSN# ______________________
Bonus 1 (5 pts)
I STILL THINK THAT THE BONUS QUESTIONS ARE PRIVILEDGED INFORMATION.
Bonus 2 (5 pts)
I STILL THINK THAT THE BONUS QUESTIONS ARE PRIVILEDGED INFORMATION.