1. SI Online Gymnosperms Practice Question Topic 17 Spring 2009
Biology
SI Online
Gymnosperms
Practice Question
Topic 17
Spring 2009
Dr. Hughey’s Bio 3 (Lab.)
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Phylum ___________
Coniferophyta
Phylum ___________
Pinus
What is botanical name in each picture? What does it produce? A) B)
A) Microsporangiate strobili-pollen
B) Megasporangiate(ovulate) strobili - megasporangia
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Phylum ___________
Coniferophyta
Phylum ___________
Pinus
What does this structure (botanical) name?
What does this structure produce?
Microsporangiate strobili; Pollen
Label. A: B: C: A
Microsporophylls
Microsporangia
pollen B C
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Phylum ___________
Coniferophyta
Phylum ___________
Pinus
The botanical name of the left structure?
Megasporangiate(ovulate) strobili
Label A: B: C: D: E: F:
Ovulriferous scale
Megasporocyte
Nucellus(megasporangia)
Integument
Micropyle
Sterile bract
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In the male cone,what does each Microsporophyll bears? How many?
two microsporangia
The following explains what happens inside a male cone. Fill in the blank or circle it.
In each microsporangium
- Each microspore mother cell (microsporochyte(2n))
(meiosis/mitosis)  ___ microspores  (meiosis/mitosis)
Develops into __________ enclosed by immature male gam metophytes.
four
pollen grains
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What is common name and botanical name in the left structure?
Pollen; immature male(micro) gametophytes(n)
How many cells are included in each structure?
4-celled A B C
Label. A: B: C: D:
2 prothallial cells
Generative cell D
Tube cell
Wings
What is the function of D on the structure?
Aid in dispersal by wind
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Left pictures are shown pollination of a Gymnosperms.
How do gymnosperms ferilize?
Pollen tube fuses with egg cell and conveys the sperms
After pollination, write three things happens to pollen. 1) 2) 3)
The pollen grain germinates.
Pollen tube begins to form.
The two sperms appear if the female gametophyte is mature.
What is the name of left structure?
Germinating pollen.;
Microgammetophyte(n).
Are the sperms seen in the left structure?
Nope! The sperms DO NOT appear until the female gametophyte is mature.
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What is the name of left structure? A
Germinating pollen.;
Microgammetophyte(n).
Label C B A: B: C: D:
Wings
Pollen tube
Sperms
Tube nucleus D
How many sperms per each male(micro) gametophytes?
Two sperms
What is the function of B on the structure?
Nonmotile sperms are conveyed the eggs of the archegonia by pollen tube(B).
(True/False) Two sperms fertilize two eggs. Justify your answer.
One sperm fertilizes and the other has no function and disintegrates.
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9. Designed by Pyeongsug Kim, ©2009
Phylum ___________
Coniferophyta
Phylum ___________
Pinus
What is the name of structure A & B?
A is young one and B is mature one.
Megasporangiate(ovulate) strobili
The part (red circle) is called “scale.” A
In the stage of A, each scale bears _________, which eventually develop into seeds.
two ovules
In the stage of B, each scale bears _________.
two seeds B
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Phylum ___________
Coniferophyta
Phylum ___________
Pinus
What is the name of left structure?
Megasporangiate(ovulate) strobili
Label A: B: C: D: E: F:
Ovulriferous scale
Megasporocyte
Nucellus(megasporangia)
Integument
Micropyle
Sterile bract
Continue to next slide….
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The picture is cross section of a structure in female cone.
What is the structure name? B
Ovule A C
This structure develops into what?
Seed
The part C develops into what?
Seed coat
Label A: B: C: D: D
Archegonia
Megagametophyte(n)
Integument
Nucellus
Is this picture shown during or after fertilization? How do you know?
Nope! Pollen tube is not formed.
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Which one is after fertilization?
How do you know?
B; pollen tube fusing with archegonia is seen. A
(Before/After) fertilization
What is this? function?
Pollen tube; fuses with egg cell and conveys the sperms B
(Before/After) fertilization
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You are seeing pine seeds and cross-section of a seed.
A pine seed is developed from _______.
a ovule
Label A: B: C: D: E: F: G: H: I:
Nucellus
Seed coat
Root apex(Apical meristem)
Megagametophyte(n)
Cotyledons
Shoot apex
Hypocotyl-root axis
Root cap
Embyo(2n) B A D C I E F G H
The part B is developed from _________.
integument
The part I develops into __________________.
Young sporophyte(2n)
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You are seeing pine seedings.
What is the green one(botanical name)?
Young sporophyte(2n)
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You are seeing a pine tree. What stage is this tree in its life cycle?
Mature sporophyte(2n)
Pines are (monoecious/dioecious), both male and female cones or _______ are borne on the (same/different) plant.
strobili
In some Pinus, female cones are in the higher branches than male cones. Why?
This minimizes self-pollination.
Most pine trees do cross-pollination.
Pines are __________ dominant.
sporophyte
Pines are (homosporous/heterosporous)
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Phylum ___________
Genus ___________
Cycadophyta
Phylum ___________
Genus ___________
Cycadophyta
Cycas
Zamia
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Phylum ___________
Genus ____________
Coniferophyta
Ginkophyta
What is the “species” of the below picture?
Ginkgo biloba
Microsporangiate strobili
Megasporangiate strobili
(Ovulate)
Label A & B:
Monoecious? Dioecious?
Dioecious
Which one is male or female plant? A B
Male Ginkgo
Female Ginkgo
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Phylum ___________
Genus ____________
Gnetophyta
Gnetum
What are A & B?
Hint:plant a is female.
Plant b is male.
A-megasporngiate
B-microsporangiate A B b a
Monoecious? Dioecious?
Dioecious
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Phylum ___________
Genus ____________
Gnetophyta
Ephedra
What is the structure name in a small picture?
Microsporagiate strobili
Female plant
Male plant
Monoecious? Dioecious?
Dioecious
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Phylum ___________
Genus ____________
Gnetophyta
Welwitschia
The left picture is come from male plant.
What is the name of this structure?
Microsporagiate strobili
Monoecious? Dioecious?
Dioecious
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