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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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
Source:
Source:
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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Source:
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
Source:
Source:
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
Source:
Source:
Flashcard set info:
Author: zeestree
Main topic: Biology
Topic: Flowers and Fruits
School / Univ.: University of Hawaii at Manoa
City: Honolulu
Published: 20.04.2010
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All cards (15)
advanced (1)
angiosperms (10)
asteraceae (1)
classification (1)
definition (1)
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dry (1)
eudicots (1)
evolution (3)
fleshy (1)
floral symetry (1)
flower (1)
flowers (6)
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infloresence (1)
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orchidaceae (1)
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petals (1)
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pollination (1)
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sepals (2)
stamens (2)
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