45049-1299618204-9.3 - plant reproduction

8/2/2019 45049-1299618204-9.3 - plant reproduction

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Plant reproduction

IB Syllabus 9.3


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Use the following to label the flower diagram below:

Style, stamen, sepal, filament, peduncle, ovary, anther, receptacle, carpel,

stigma, petal, ovule.

andromeda.cavehill.uwi.edu


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Flower Diagram



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Structure and Function of the Flower Quiz #1

1. What is the male part of the flower called?

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2. What is the main function of a flower?

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3. What is the function of the carpel?

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4. Give one example of a hermaphrodite flower

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What is a Flower?

Plant organ forsexual reproduction

Flowers produce gametes (sex cells)

Flowers are necessary forfertilisation to

occur



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Parts of the Flower

Peduncle: flower stalk

Receptacle: part of stalk bearing the floral organs, at base of flower

Sepal:leaflike structures at flower base, protects young flower bud Calyx: all the sepals together form the calyx

Petal: located inside and above the sepals, often large and colourful,

sometimes scented, sometimes producing nectar

Stamen: male part of the flower, consist of the antherand filament, makes

pollen grains

Pollen: grains containing the male gametes

Pistil/Carpel: female part of the flower, consist of the stigma, style and ovary

Ovule: located in the ovaries, carry female gametes

Staminate flower: flower bearing only male parts Pistillate/Carpellate flower: flower bearing only female sex parts

Hermaphrodite flower: flower bearing both male and female sex parts



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Plant reproduction

Pollination Delivery of pollen to the stigma of the flower

Fertilization Fusion of nuclei from the pollen grain and from

ovule

Zygote produced

Seed dispersal Transport of seed to spread them in the

environment


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Seed structure


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Seed Germination:Emergence of Radicle throughSeed Coat

Water Warm Temperature

So if you want to store seeds what are the conditions? Dry Cold

Dormant seeds need more than moisture and warmth:

Thick Seed Coat

Thin Seed Coat

Insufficient Development

Inhibitor: Abscisic Acid

Inhibitor: Phenolics

Scarification

Light

Soil Fungus Association

Stratification > Vernalization

Leaching by Repeated Rain

Kentucky Coffee Tree

Lettuce

Orchids

Most CT feral plants

Cacti

Darkor or Pea

Dormancy is caused by: Is overcome by: Example:

Seeds lacking dormancy need:

nick digestscrub fire

freeze-thaw cycles

6 weeks at 4 C 20 C

plantphys.info/plants_human/lecppt/seedgerm.ppt


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Capsella Seed:

Seed Coat

Endosperm

Embryo

Shoot Apex

Cotyledons - dicot

Hypocotyl

Radicle

Root Apex

Micropyleplantphys.info/plants_human/lecppt/seedgerm.ppt


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Lettuce Seed Germination

660 nm

730 nm

dark

Seed Coat

tran

sla

tion

transc

ripti

on

hydro

lysis

starch

sugar

-amylase

RNA

DNA

imbibition

water

radicle apex

shoot apex

growth

dicot

photoreversibility

Pfr Prphotoactivation

Embryo

phytochrome

red and

white light

stimulate

germination

cotyledons

plantphys info/plants human/lecppt/seedgerm ppt

45049-1299618204-9.3 - plant reproduction

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