Transcript A.P. Day 128, 09

A.P. Topics…let’s take Latin 5!
• How does photosynthesis convert light
energy into chemical energy?
• How are the chemical products of the lighttrapping reactions coupled to the synthesis of
carbohydrates?
• What kinds of photosynthetic adaptations
have evolved in response to different
environmental conditions?
• What interactions exist between
photosynthesis and cellular respiration?
How has the terrestrial
environment influenced plants?
Limiting factors…
• Water (humidity)
• Light
• Soil Nutrients: nitrogen, phosphorus, potassium,
other minerals
• Wind
• Competition
• Cooperation…symbiosis
What is the basic anatomy of a
plant?
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Waxy Cuticle
Jacketed Gamantia
Roots
Stems
Leaves
Plants
• Bryophyte:nonvasular spore producer, dominant
haploid gametophyte and reduced diploid
sporophyte. Needs water to reproduce
• Pterophyte: vascular spore producer, reduced
haploid, dominant sporopyte…sporangium on
fronds
• Gymnosperms: pollen is male gametophyte and
ovule is female gametophyte. Food produced first,
then baby
• Angiosperm: double fertilization, stamen and
carpals (pistal)
Angiosperms: Monocots vs. Dicots
• Monocots: fibrous root system, one
cotyledon, parallel veins, scattered vascular
bundles in stems, floral parts in 3’s
• Dicots: taproots, two cotyledons, netlike
veins, vascular bundles in stems, floral parts
in 4’s and 5’s.
Roots
• Function?
• Root hairs
• Some have advantageous roots, ie.
Mangroves, corn.
Stems
• Function?
• Alternating nodes…point where leaves
attach
• Auxiliary buds
• Terminal bud…apical dominance
• Modified stems: tubers, rhizomes, stolons
(runners), bulbs
Leaves
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Function?
Blade
Petiole
Simple, compound, doubly compound
Some adaptations: tendrils, spines (stems do
photo), succulents store water, colorful
leaves to attract insects
Tissues of plants
• Dermal
• Vascular
– Xylem: tracheids and vessel elements
– Phloem: sieve-tube members and companion
cells
• Ground
-pith, cortex
How did terrestrial plants evolve
and how do their reproduce? Life
cycles