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35 Cards in this Set
- Front
- Back
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What does a seed consist of? |
an embryo, its food supply, surrounded by a protective coat |
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When a plant produces only one type of spore and gives rise to a bisexual gametophyte, the plant is said to be _______. |
homosporous |
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When a plant produces 2 kinds of spores, megaspores and microspores, it is said to be _________. |
heterosporous |
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What are the two types of spores that heterosporous plants produce? |
megaspores and microspores |
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What produces microspores? |
microsporangia |
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What produces megaspores? |
megasporangia |
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How many functional megaspores do each megasporangium have? |
One |
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What is the layer of sporophyte tissue called that envelopes and protects the megasporangium? |
integument |
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How many integuments do gymnosperm have?
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One |
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How many integuments do angiosperms have? |
Two |
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Which type of seed plant has two integuments? |
Angiosperms |
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Which type of seed plant has one integument? |
Gymnosperms |
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What is the structure that is comprised of a megasporangium, megaspore, and integument called? |
Ovule |
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What does a microspore develop into? |
Pollen grain |
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What is a male gametophyte enclosed in a pollen wall? |
Pollen grain |
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What is a pollen grain? |
male gametophyte enclosed in a pollen wall |
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Why is the male gametophyte said to be in the pollen grain and not equivalent to it? |
The outer layer of the pollen wall is composed of molecules secreted by sporophyte cells |
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What polymer does the pollen wall contain? |
Sporopolenin |
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What is the function of the pollen wall? |
Protects pollen grain |
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The function of the ________ is to protect the pollen grain |
Pollen wall |
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What is pollination? |
transfer of pollen to the part of the seed plant which contains ovules. |
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Name this process: the transfer of pollen to the part of the seed plant which contains ovules. |
Pollination. |
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What happens when a pollen grain reaches an ovule and germinates? |
gives rise to pollen tube that discharges sperm into female gametophyte within ovule |
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What is a micropyle? |
A small pore in an ovule that the pollen enters during pollination; how the pollen gets access to the ovule |
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What is the small pore in ovules called that pollen enters during pollination? |
micropyle |
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If a sperm fertilizes an egg of a seed plant, what does the zygote grow into? |
Sporophyte embryo |
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_____ can remain dormant for years while _____ have shorter lives. |
seeds; spores |
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What is the coat of the seed derived from? |
The integument of the ovule |
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What is the spore wall of the seed derived from? |
megasporangium that dries out after fertilization |
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Where are ovules found in conifers? |
Ovulate cone |
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Where are ovules found in angiosperm? |
Ovary |
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How many ovules does an ovulate cone have? |
Two |
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Where does a pollen grain develop in angiosperms? |
Anther |
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Where does a pollen grain develop in conifers? |
pollen cone |
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Name this process: the discharging of sperm through a pollen tube to reach an egg, initiating the transformation of the ovule into a seed |
Fertilization
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