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All main topics / Biology / Flowers and Fruits

Flowers & Fruits (15 Cards)

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2
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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
Tags: angiosperms, evolution, flowers, sepals, stamens
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4
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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)
Tags: angiosperms, flowers
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5
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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
Tags: angiosperms, evolution, flowers, trends
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11
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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
Tags: angiosperms, flowers, sexual reproduction
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12
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What are 3 mechanisms that may promote outcrossing?
1. Genetic self-incompatibility
2. spatial separation of sexes
3. temporal separation of sexes
Tags: angiosperms, flowers, outcrossing, sexual reproduction
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13
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Define protandry vs. protogyny.
Protandry: pollen shed before stigma receptive
Protogyny: stigma receptive before pollen shed.
Tags: angiosperms, flowers, protandry, protogyna
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
Tags: angiosperms, flowers, fruits
 
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All cards (15)
advanced (1)
angiosperms (10)
asteraceae (1)
classification (1)
definition (1)
dehiscent (1)
dry (1)
eudicots (1)
evolution (3)
fleshy (1)
floral symetry (1)
flower (1)
flowers (6)
fruits (2)
indehiscent (1)
infloresence (1)
monocot (1)
orchidaceae (1)
outcrossing (1)
ovary position (1)
petals (1)
pistil (1)
pollination (1)
protandry (1)
protogyna (1)
sepals (2)
sexual reproduction (2)
stamens (2)
trends (1)
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