21. Before pollination occurs, what does an individual flower potentially have that an individual pine cone does not have? a sporophyll b. both male and female gametophytes c. sporangia d. structures for dispersing seed or pollen grains e. spore mother cells

21. Before pollination occurs, what does an individual flower potentially have that an individual pine cone does not have? a sporophyll b. both male and female gametophytes c. sporangia d. structures for dispersing seed or pollen grains e. spore mother cells

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter26: Seed Plants

Section: Chapter Questions

Problem 8RQ: Megasporocytes will eventually produce which of the following? pollen grain sporophytes male...

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21. Before pollination occurs, what does an individual flower potentially have that an individual pine cone
does not have?
a sporophyll
b. both male and female gametophytes
c. sporangia
d. structures for dispersing seed or pollen grains
e. spore mother cells

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After double fertilization: a zygote and ______ form. an ovule endosperm a cotyledon asuspensor
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The pollen lands on which part of the flower? stigma style ovule integument
_______ is the arrival of pollen on a receptive stigma.
Choose the statement that is true. a. All flowers are pollinated by bees. b. Apple trees are propagated by grafting because they are triploid. c. Carpels function to attract pollinators. d. A coleoptile protects the plumule of eudicot seedlings. e. The arrival of pollen on a receptive seed is called pollination. f. In plants, sperm cells are male gametes. g. Nutrients in fruits nourish new seedlings.
Pollen grains develop in which structure? a. the anther b. the stigma c. the filament d. the carpel
Place the following events in the correct order: 1. pollen tube grows into ovule 2. insect lands on flower to drink nectar 3. embryo develops within the seed 4. fertilization occurs 5. pollen carried by insect contacts stigma (a) 2, 5, 1, 4, 3 (b) 1, 4, 2, 5, 3 (c) 3, 2, 5, 1, 4 (d) 5, 1, 3, 4, 2 (e) 2, 5, 4, 3, 1
In flowers, a _______ contains one or more ovaries. a. Pollen sac b. Carpel c. receptacle d. sepal
Megasporocytes will eventually produce which of the following? pollen grain sporophytes male gametophytes female gametophytes
Which of the following traits characterizes gym nosperms? The plants carry exposed seeds on modified leaves Reproductive structures are located in a flower After fertilization, the ovary thickens and forms a fruit The gametophyte is the longest phase of the life cycle.
Figure 14.26 If a flower lacked a megasporangium, what type of gamete would it not be able to form? If it lacked a microsporangium, what type of gamete would not form?
Figure 32.3 If the anther is missing, what type of reproductive structure will the flower be unable to produce? What term is used to describe a flower that is normally lacking the androecium? What term describes a flower lacking a gynoecium?