Term
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Definition
| Sporophytes produce only one kind of spore |
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Term
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Definition
| production of two different kinds of spores |
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Term
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Definition
| develop into female gametes |
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Term
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Definition
| develop into male gametophytes |
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Term
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Definition
| where the embryo is surroundied and protected by gametophyte and sporophyte tissues |
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Term
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Definition
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Term
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Definition
| several sporangiophores bearing sporangia |
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Term
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Definition
| aids in the dispersal of the spores |
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Term
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Definition
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Term
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Definition
| cluster of sporophylls at the end of the shoot |
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Term
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Definition
| naked seed plants, four phyla, seeds not covered by fruit, most primitive seed plants |
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Term
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Definition
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Term
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Definition
| male structure, small, sends out pollen, gametophytic stage |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| maidenhair tree, only species of Ginkophyta, deciduous, fan shaped leaves, dichotomous venation, dieocious, male trees have microsporangiate strobili, ovulate trees have large fleshy seeds |
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Term
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Definition
| only one species, Ginko biloba |
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Term
| microsporangiate strobili |
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Definition
| male cones in Ginko Biloba |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| three genera, 70 species, Ephedra, true seed plant |
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Term
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Definition
| cone bearing plants, over 50 genera, most common |
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Term
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Definition
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Term
| male cones on coniferophyta |
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Definition
| strobili composed of microsporophylls, pollen cones |
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Term
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Definition
| produced in microsporangia |
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Term
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Definition
| pouches on the lower surface of each microsporophyll |
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Term
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Definition
| microgametophyte, three parts |
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Term
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Definition
| pollen grains are carried by wind or other vectors to the female cones where the germinate. they develop pollen tubes within which the sperm are transported |
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Term
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Definition
| strobili composed of megasporophylls |
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Term
| megasporangia of seed plants |
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Definition
| called the nucellus, covered by one or two layers of tissue, the entire structure is an ovule |
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Term
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Definition
| the woody scale of the seed cone, modified shoots of indeterminate growth |
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Term
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Definition
| gives rise to the mature gametophyte |
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Term
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Definition
| protects the seed, made from the integuements |
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Term
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Definition
| consists of an epicotyl, hypocotyl, radicle, and several cotyledons |
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
| gives rise to the pollen tube |
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Term
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Definition
| gives rise to the two sperm |
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Term
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Definition
| opening into the pollen chamber |
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