Unit 8 Objectives:
Plant Anatomy & Physiology
CHAPTER 38: Angiosperm Reproduction and Biotechnology
Sexual Reproduction
1.
In general terms, explain how the basic plant life cycle with alternation of generations is modified
in angiosperms.
2.
List four floral parts in order from outside to inside a flower.
3.
From a diagram of an idealized flower, correctly label the following structures and describe the
function of each structure:
a. sepals
b. petals
c. stamen (filament and anther)
d. carpel (style, ovary, ovule, and stigma)
4.
Distinguish between:
a. complete and incomplete flowers
b. bisexual and unisexual flowers
c. monoecious and dioecious plant species
5.
Explain by which generation, structure, and process spores are produced.
6.
Explain by which generation, structure, and process gametes are produced.
7.
Name the structures that represent the male and female gametophytes of flowering plants.
8.
Describe the development of an embryo sac and explain the fate of each of its cells.
9.
Explain how pollen can be transferred between flowers.
10.
Distinguish between pollination and fertilization.
11.
Describe mechanisms that prevent self-pollination.
12.
Outline the process of double fertilization. Explain the adaptive advantage of double
fertilization in angiosperms.
13.
Explain how fertilization in animals is similar to that in plants.
14.
Describe the fate of the ovule and ovary after double fertilization. Note where major nutrients
are stored as the embryo develops.
15.
Describe the development and function of the endosperm. Distinguish between liquid
endosperm and solid endosperm.
16.
Describe the development of a plant embryo from the first mitotic division to the embryonic
plant with rudimentary organs.
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17.
From a diagram, identify the following structures of a seed and state a function for each:
a. seed coat
f. epicotyl
b. proembryo
g. plumule
c. suspensor
h. endosperm
d. hypocotyls
i. cotyledons
e. radicle
j. shoot apex
18.
Explain how a monocot and dicot seed differ.
19.
Explain how fruit forms and ripens.
20.
Distinguish among simple, aggregate, and multiple fruit. Give an example of each type of fruit.
21.
Explain how selective breeding by humans has changed fruits.
22.
Explain how seed dormancy can be advantageous to a plant. Describe some conditions for
breaking dormancy.
23.
Describe the process of germination in a garden bean.
CHAPTER 39: Plant Response to Internal and External Signals
Signal Transduction and Plant Responses
1. Compare the growth of a plant in darkness (etiolation) to the characteristics of greening (deetiolation).
2. Describe the signal pathways associated with de-etiolation.
3. Describe the role of second messengers in the process of de-etiolation.
4. Describe the two main mechanisms by which a signaling pathway can activate an enzyme.
5. Explain, using several examples, what researchers have learned about the activity of plant
hormones by study of mutant plants.
Plant Responses to Hormones
6.For the following scientists, describe their hypothesis, experiments, and conclusions about the
mechanism of phototropism:
a. Charles and Francis Darwin
b. Peter Boysen-Jensen
c. Frits Went
7. List six classes of plant hormones, describe their major functions, and note where they are
produced in the plant.
8. Explain how a hormone may cause its effect on plant growth and development.
9. Describe a possible mechanism for the polar transport of auxin.
10. According to the acid growth hypothesis, explain how auxin can initiate cell elongation.
11. Explain why 2,4-D is widely used as a weed killer.
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12. Explain how the ratio of cytokinin to auxin affects cell division and cell differentiation.
13. Describe the evidence that suggests that factors other than auxin from the terminal bud may
control apical dominance.
14. Describe how stem elongation and fruit growth depend on a synergism between auxin and
gibberellins.
15. Explain the probable mechanism by which gibberellins trigger seed germination.
16. Describe the functions of brassinosteroids in plants.
17. Describe how abscisic acid (ABA) helps prepare a plant for winter.
18. Describe the effects of ABA on seed dormancy and drought stress.
19. Describe the role of ethylene in the triple response to mechanical stress, apoptosis, leaf
abscission, and fruit ripening.
Plant Responses to Light
20. Define photomorphogenesis and note which colors are most important to this process.
21. Compare the roles of blue-light photoreceptors and phytochromes.
22. Describe the phenomenon of chromophore photoreversibility and explain its role in light-induced
germination of lettuce seeds.
23. Define circadian rhythm and explain what happens when an organism is artificially maintained in a
constant environment.
24. List some common factors that entrain biological clocks.
25. Define photoperiodism.
26. Distinguish among short-day, long-day, and day-neutral plants. Explain why these names are
misleading.
27. Explain what factors other than night length may control flowering and what is necessary for
flowering to occur.
Plant Defense: Responses to Herbivores and Pathogens
28. Explain how plants deter herbivores with physical and chemical defenses.
29. Describe the multiple ways that plants defend against pathogens.
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