What did sepals evolve from? Petals? Stamens? Carpels?
Sepals: Modified leaves
Petals: modified leaves OR stamens that lost sporangia
Stamens: reduced microsporophylls OR branches with terminal sporangia
Carpels: folded megasporophylls
Petals: modified leaves OR stamens that lost sporangia
Stamens: reduced microsporophylls OR branches with terminal sporangia
Carpels: folded megasporophylls
Tags: angiosperms, evolution, flowers, sepals, stamens
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Quelle:
What is a "perfect" flower? A pistillate flower? A staminate flower?
Has both male, female parts. I.E: has stamens and pistils
Pistillate: lack stamens (female flower)
Staminate: lack pistils (male flower)
Pistillate: lack stamens (female flower)
Staminate: lack pistils (male flower)
Tags: angiosperms, flowers
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Quelle:
Describe the evolutionary trends of primitive flowers (floral parts, completeness, organ arrangement, ovary position, symmetry):
Floral parts: many, indefinite #
Completeness: complete
Organ arrangement: spiral
Ovary: superior
Symmetry: radial
Completeness: complete
Organ arrangement: spiral
Ovary: superior
Symmetry: radial
Tags: angiosperms, evolution, flowers, trends
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Quelle:
Sexual reproduction may involve selfing or outcrossing. What are these?
Selfing: pollination between anthers, pistil on 1 plant
Outcrossing: pollination between anthers, pistils on separate plants
Outcrossing: pollination between anthers, pistils on separate plants
Tags: angiosperms, flowers, sexual reproduction
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Quelle:
What are 3 mechanisms that may promote outcrossing?
1. Genetic self-incompatibility
2. spatial separation of sexes
3. temporal separation of sexes
2. spatial separation of sexes
3. temporal separation of sexes
Tags: angiosperms, flowers, outcrossing, sexual reproduction
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Quelle:
Define protandry vs. protogyny.
Protandry: pollen shed before stigma receptive
Protogyny: stigma receptive before pollen shed.
Protogyny: stigma receptive before pollen shed.
Tags: angiosperms, flowers, protandry, protogyna
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Kartensatzinfo:
Autor: zeestree
Oberthema: Biology
Thema: Flowers and Fruits
Schule / Uni: University of Hawaii at Manoa
Ort: Honolulu
Veröffentlicht: 20.04.2010
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