Kingdom Plantae
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All plants are eukaryotic
autotrophs making food from
sunlight through photosynthesis.
There are, however, a few species
that are both autotrophs and
heterotrophs.
Plants have cell walls made of
cellulose.
Primary consumers eat only
plants.
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Land plants evolved from green algae
Researchers have identified green algae
called charophyceans as the closest
relatives of land plants
Adaptations Enabling the Move to Land
• In charophyceans
– A layer of a durable polymer called
sporopollenin prevents exposed zygotes from
drying out
• The accumulation of traits that facilitated
survival on land
– May have opened the way to its colonization
by plants
• There are four key traits that land plants share
only with charophyceans
– Rose-shaped complexes for cellulose
synthesis
– Peroxisome enzymes
– Structure of flagellated sperm
– Formation of a phragmoplast
Derived Traits of Plants
• Five key traits appear in nearly all land plants
but are absent in the charophyceans
– Apical meristems
– Alternation of generations
– Walled spores produced in sporangia
– Multicellular gametangia
– Multicellular dependent embryos
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Cuticle – a protective waxy coating
that prevents H2O in plant tissues
from evaporating into the atmosphere.
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Within the cuticle are stomata that
allow exchange of gases.
Guard cells open and close pores in
the stomata to release O2 into the
atmosphere and take in CO2.
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A leaf is a broad flat organ that
traps light energy for
photosynthesis and exchanges
gases through stomata.
Root – a plant
organ that
anchors the
plant in soil
and absorbs
H2O and
minerals from
soil
transporting
them to the
stem.
•A root cell’s
job is to take
water and
nutrients from
the soil and
send them up
to the part of
the plant
above the
ground.
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The stem is the plant’s structural
support for upright growth
containing tissues to transport
H2O, minerals, and nutrients from
one part of the plant to another.
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Stems may also store food.
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Green stems carry on
photosynthesis.
AP Biology April 30
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Plants PP continued
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Private Life of Plants
Animal practical
Coming up…………….
- Plant Test May 4
- Chapter 47 objectives
- Animal systems and structure
- Abstract ?
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Growing root includes 3 regions:
- root tip
- elongation region
- maturation region
Root tip and elongation region are sites of
primary growth through apical meristem
tissue
Maturation zone, vascular tissue forms
primary xylem and phloem which forms
stele (the inner concentric cylinder)
Plant Vascular Tissues
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Xylem – made up of a series of
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Phloem – made up of a series of
dead tubular cells that transport
H2O and dissolved minerals
upward from roots to leaves.
living tubular cells that transport
sugars from leaves to all parts of
the plant.
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Two types of xylem cells:
- tracheids which are are long and thin
- vessel elements which are short and thick
Phloem cells are made up of
- sieve tube elements (carry nutrients)
- companion cells (support sieve tube
elements)
• When there is no water in the soil for the plant, it
looses turgor pressure (wilts).
Leaf cell
Animal Cell
•Chlorophyll absorbs energy from
sunlight and passes that energy into the
stroma.
•Stroma contain enzymes that turn light
energy into sugar and oxygen from water
and carbon dioxide.
SUNLIGHT + 6CO2 + 6 H2O
C6H12O6 + 6O2
•Grana are stacks light trapping
chlorophyll.
• When we burn wood, basically the
photosynthesis formula is reversed.
• We're breaking down the
carbohydrate and producing carbon
dioxide gas and water, plus energy,
which, like sunlight, feels hot and
looks bright.
Alternation of Generations
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Sexual reproduction
involves the two alternating
processes of meiosis and
fertilization.
In meiosis, the chromosome
number is reduced from the
diploid to the haploid number.
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In fertilization, the nuclei
of two gametes fuse, raising
the chromosome number from
haploid to diploid.
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In most plants meiosis and fertilization
divide the life of the organism into two
distinct phases or "generations".
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The gametophyte generation begins
with a spore produced by meiosis. The
spore is haploid, and all the cells
derived from it (by mitosis) are also
haploid. In due course, this
multicellular structure produces
gametes — by mitosis — and sexual
reproduction then produces the diploid
sporophyte generation.
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In fact, the gametophyte generation is the
major stage in the life of mosses and an
independent plant in ferns.
However, the gametophyte is only an
inconspicuous structure in angiosperms and
other "higher" plants.
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The sporophyte generation
produces spores (diploid) which
develop into the gametophyte
generation.
The gametophyte generation
produces gametes (haploid).
In vascular plants, the sporophyte
generation is dominant.
In non-vascular plants, the
gametophyte is larger and more
conspicuous than the sporophyte.
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Plant Tropisms
Phototrophism - growth toward light
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Plant Tropisms
Gravitropism – downward growth of roots
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Plant Tropisms
- Thigmotropism
– plants response
when it comes
into contact with
a solid object.
Vegetative Reproduction……………….
……………is asexual
Plant Growth
• Meristematic tissue is made up of actively
dividing cells
• Primary growth occurs via apical
meristems in the tips of roots and stems
• Secondary growth is carried out by lateral
meristems increasing the girth of the plant
- two types of cells: vascular cambium
cork cambium
• Vascular cambium
produces secondary xylem and
phloem secondary which replaces
primary xylem and primary phloem
• Cork cambium produces the tissues of the
outer bark
• Plants also have lenticels which allow for gas
exchange through bark
Bryophytes vs Tracheophytes
what’s the difference?
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Division Bryophyta – mosses,
liverworts, hornworts. All are nonvascular and non-seed.
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Bryophyte gametophytes
 Produce flagellated sperm in antheridia
 Produce ova in archegonia
 Generally form ground-hugging carpets
and are at most only a few cells thick
Some mosses
 Have conducting tissues in the center
of their “stems” and may grow
vertically
Bryophyte Sporophytes
• Bryophyte sporophytes
– Grow out of archegonia
– Are the smallest and simplest of all extant
plant groups
– Consist of a foot, a seta, and a sporangium
• Hornwort and moss sporophytes
– Have stomata
• Concept 29.4: Ferns and other seedless
vascular plants formed the first forests
• Bryophytes and bryophyte-like plants
– Were the prevalent vegetation during the first
100 million years of plant evolution
• Vascular plants
– Began to evolve during the Carboniferous
period
Division Lycophyta -
Club Mosses –
vascular and non-seed.
Division Pterophyta
whisk ferns, horsetails, and ferns
vascular and non-seed.
Seed Bearing Plants
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Gymnosperms
are vascular
plants that
produce seeds
on scales of
woody strobili
called cones.
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In other words, they have
naked seeds - seeds not
enclosed in a fruit.
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The four divisions of
Gymnosperms are:
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Cycadophyta
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Ginkgophyta
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Gnetophyta
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Coniferophyta
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Cycads have a terminal rosette of
leaves and bear seeds in cones.
All cycads have separate male and
female plants.
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Division
Ginkgophyta has
only on living
species – Ginkgo
biloba.
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The leaves are
lobed.
Like Cycads,
Ginkgos have
separate male
and female trees.
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Division Gnetophyta has 3 genera:
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Gnetum
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Ephedra
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Welwitschia
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Coniferophyta is the largest and most
diverse division of the gymnosperms.
Most are evergreen – keeping their
leaves year-round.
A very few are deciduous – dropping
all of their leaves at
the same time
Angiosperms include one division Anthophyta
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Though there is only one division
of angiosperms, Anthophyta ….
It is the largest and most diverse
group of seed plants on Earth.
Anthophytes produce flowers,
then seeds enclosed in a fruit.
Anthophytes can be annuals,
biennials, or perennials.
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What is an annual?
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What is a biennial?
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What is a perennial?
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AP Biology: May 2
Kingdom Plantae continued
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Kingdom Practical
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Presentations ? Private Life of Plants ?
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Coming up:
- Parade of Kingdoms Test corrections due
5/4
- Kingdom Plantae test ?
- Continue reading – chapter 47 due May 4
- 6th Abstract due May 8 – plants or systems
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Male
Gametophyte
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Female
Gametophyte
What is the purpose of fruit?
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Seeds can be dispersed in a
variety of ways:
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Wind
Passing through an animals
digestive system
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Catching on fur or skin
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Floating on water
Division Anthophyta has two
classes of angiosperms ….
Monocots and Dicots
Possible Advantages to
Alternation of Generations
• Amplification of the sexual product
because it produces many spores.
• Possibly useful in an environment
where limited water availability for
successful fertilization limits the
number of successful zygotes.
Adaptations to Survival in the
Terrestrial Environment
• Separation of absorbtive organs
(roots) and photosynthetic organs
(leaves)
• Waterproof cuticle
• Stomata
• Vascular tissues (xylem and phloem)
• Structural support tissues
(cellulose and lignin)
• Species dispersal (spores and seeds)
Adaptations to Survival in the
Terrestrial Environment
• Protection of gametes in gametangia
• Fertilization in the absence of free
water (pollen tubes instead of
swimming sperm)
• Zygote and sporophyte embryo
protected and nurtured by gametophyte
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Fungi
Coniferophyta
Anthophyta
Bryophyta
Lichen
Ginkgophyta
Primative seedless vascular plants
Algae
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Early chordates
Recent chordates
Mollusca
Annelida
Cnidaria
Arthropoda – Insecta
Porifera
Platyhelmenthes and Nematoda
Arthropoda – Arachnida, Mesostomata,
Crustacea, Myriapoda
Echinodermata
1. Why were adaptations necessary for
plants to become terrestrial ?
2 What were the adaptations?
3. What is the general term for growth
tissue of plants?
4. Describe the difference(s) between
gymnosperms and angiosperms.
5. Describe the two patterns of growth
in seed plants?
1. Plants were no longer surrounded by water when
they became terrestrial. They needed to get
water, stay upright, reproduce without
surrounding water.
2. Specialized root tissue, waterproof cuticle,
specialized stem tissue with vascular tissue,
leaf tissue, spores, seeds.
3. Meristematic tissue.
4. Gymnosperms are either Cycadophyta,
Ginkgophyta, Gnetophyta, or Coniferophyta.
4. Cont. They reproduce using strobilli –
naked cones. Angiosperms belong to
phylum Anthophyta and include all
flowering plants. The flower is a
specialized reproductive structure that
produces seeds (zygote) covered by
fruit.
5. The two patterns of growth in
angiosperms are monocots and dicots.
Division Anthophyta has two classes of
angiosperms ….
Monocots and Dicots
1. Describe the two types of vascular
tissue and the cells that make them?