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Kingdom Plantae Evolutionary tree of plants From primitive more advanced traits Angiosperms Bryophytes Green alga ancestor Trachephytes Gymnosperms Flowers Seeds and pollen Vascular Terrestrial [email protected] ______ 2 [email protected] 3 I. SEED PLANTS A. All are heterosporous vascular plants. B. Three major reproductive adaptations: 1. Gametophyte reduced to dependence on sporophyte: retained in moist reproductive tissue. 2. Seed – “baby plant in a lockbox with its lunch”; highly resistant structures that allow for a dormant phase in the life cycle to wait out poor environmental conditions. 3. Evolution of pollen as male gametophyte – many seed plants are no longer tied to external water for fertilization. C. Common ancestor with seeds gave rise to all seed plants (gymnosperms and angiosperms); together, gymnosperms and angiosp.
Kingdom Plantae Evolutionary tree of plants From primitive more advanced traits Angiosperms Bryophytes Green alga ancestor Trachephytes Gymnosperms Flowers Seeds and pollen Vascular Terrestrial [email protected] ______ 2 [email protected] 3 I. SEED PLANTS A. All are heterosporous vascular plants. B. Three major reproductive adaptations: 1. Gametophyte reduced to dependence on sporophyte: retained in moist reproductive tissue. 2. Seed – “baby plant in a lockbox with its lunch”; highly resistant structures that allow for a dormant phase in the life cycle to wait out poor environmental conditions. 3. Evolution of pollen as male gametophyte – many seed plants are no longer tied to external water for fertilization. C. Common ancestor with seeds gave rise to all seed plants (gymnosperms and angiosperms); together, gymnosperms and angiosp.
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BOT ______: Introductory Biology of Phanerogams TOPIC Basic Life Cycles of Phanerogams: Gymnosperms and Angiosperms BY IT GBADAMOSI [email protected] ______ 1 INTRODUCTION
BOT ______: Introductory Biology of Phanerogams TOPIC Basic Life Cycles of Phanerogams: Gymnosperms and Angiosperms BY IT GBADAMOSI [email protected] ______ 1 INTRODUCTION
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Three major reproductive adaptations: 1. Gametophyte reduced to dependence on sporophyte: retained in moist reproductive tissue. 2. Seed – “baby plant in a lockbox with its lunch”; highly resistant structures that allow for a dormant phase in the life cycle to wait out poor environmental conditions. 3. Evolution of pollen as male gametophyte – many seed plants are no longer tied to external water for ______.
Three major reproductive adaptations: 1. Gametophyte reduced to dependence on sporophyte: retained in moist reproductive tissue. 2. Seed – “baby plant in a lockbox with its lunch”; highly resistant structures that allow for a dormant phase in the life cycle to wait out poor environmental conditions. 3. Evolution of pollen as male gametophyte – many seed plants are no longer tied to external water for ______.
fertilization
All are heterosporous vascular plants. B. Three major reproductive adaptations: 1. Gametophyte reduced to dependence on sporophyte: retained in moist reproductive tissue. 2. Seed – “baby plant in a lockbox with its lunch”; highly resistant structures that allow for a dormant phase in the life cycle to wait out poor environmental conditions. 3. Evolution of pollen as male gametophyte – many seed plants are no longer tied to external water for fertilization. C. Common ancestor with ______ gave rise to all seed plants (gymnosperms and angiosperms); together, gymnosperms and angiosp.
All are heterosporous vascular plants. B. Three major reproductive adaptations: 1. Gametophyte reduced to dependence on sporophyte: retained in moist reproductive tissue. 2. Seed – “baby plant in a lockbox with its lunch”; highly resistant structures that allow for a dormant phase in the life cycle to wait out poor environmental conditions. 3. Evolution of pollen as male gametophyte – many seed plants are no longer tied to external water for fertilization. C. Common ancestor with ______ gave rise to all seed plants (gymnosperms and angiosperms); together, gymnosperms and angiosp.
Kingdom Plantae Evolutionary tree of plants From ______ more advanced traits Angiosperms Bryophytes Green alga ancestor Trachephytes Gymnosperms Flowers Seeds and pollen Vascular Terrestrial [email protected] 121 2 [email protected] 3 I. SEED PLANTS A. All are heterosporous vascular plants. B. Three major reproductive adaptations: 1. Gametophyte reduced to dependence on sporophyte: retained in moist reproductive tissue. 2. Seed – “baby plant in a lockbox with its lunch”; highly resistant structures that allow for a dormant phase in the life cycle to wait out poor environmental conditions. 3. Evolution of pollen as male gametophyte – many seed plants are no longer tied to external water for fertilization. C. Common ancestor with seeds gave rise to all seed plants (gymnosperms and angiosperms); together, gymnosperms and angiosp.
Kingdom Plantae Evolutionary tree of plants From ______ more advanced traits Angiosperms Bryophytes Green alga ancestor Trachephytes Gymnosperms Flowers Seeds and pollen Vascular Terrestrial [email protected] 121 2 [email protected] 3 I. SEED PLANTS A. All are heterosporous vascular plants. B. Three major reproductive adaptations: 1. Gametophyte reduced to dependence on sporophyte: retained in moist reproductive tissue. 2. Seed – “baby plant in a lockbox with its lunch”; highly resistant structures that allow for a dormant phase in the life cycle to wait out poor environmental conditions. 3. Evolution of pollen as male gametophyte – many seed plants are no longer tied to external water for fertilization. C. Common ancestor with seeds gave rise to all seed plants (gymnosperms and angiosperms); together, gymnosperms and angiosp.
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Study Notes
Kingdom Plantae: Evolutionary Tree
- The evolutionary tree of plants shows the progression from primitive to more advanced traits.
- The green alga ancestor is the common ancestor of all plants.
Characteristics of Seed Plants
- All seed plants are heterosporous vascular plants.
- Three major reproductive adaptations of seed plants:
- Gametophyte reduced to dependence on sporophyte, retained in moist reproductive tissue.
- Seed: a highly resistant structure that allows for a dormant phase in the life cycle, protecting the "baby plant" and its nutrients.
- Evolution of pollen as male gametophyte, allowing for fertilization without external water.
Common Ancestor of Seed Plants
- The common ancestor of seed plants gave rise to both gymnosperms and angiosperms.
- Gymnosperms and angiosperms share a common ancestor that evolved seeds.
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