Transcript Introduction to plants

Introduction to plants
Observe the plants at your desk.
Discuss and jot down 3 examples of
structure meets function.
All of these plants are weeds &/or invasive
species. How do their adaptations make
them successful?
Plants have organs too!
•
•
•
•
Flowers/Fruit
Roots
Stems
Leaves
Fruity flowers?!
• Flowers—attract pollinators; produce pollen
• Gymnosperm seeds—not encased in a fruit
• Angiosperm seeds—fruit provides energy
Roots
• Primary function:
Absorb water and
minerals from the
soil
– Role of root hairs!
• Secondary
function: storage
of sugar
– Think carrots!
Stems
• Primary function:
Transport of water and
sugar.
– Xylem-Water up to
leaves
– Phloem-Food (sugar)
• Secondary function:
Storage of starch
– Think Potatoes!
Leaves
• Function:
Photosynthesis
– Mesophyll cells
contain chloroplasts
– Cuticle protects the
leaf
– Stoma: open and
close to let in CO2.
Controlled by “guard
cells”
Re-evaluate
the
relationship
between
structure and
function in
your plant!
Plant evolution
• Plants share a close common ancestor with
algae.
– Both have: chloroplasts
– Plants have: alternation of generations!
4 Major Groups of Plants
• Bryophytes
– Moss
• Pteridophytes
– Ferns
• Gymnosperms
– Conifers
• Angiosperms
– Flowering plants
What characteristics distinguish them?
How did the chloroplast evolve?
• Endosymbiosis
What process is happening in the
chloroplast?
Where is the chloroplast located?
What is necessary to absorb energy
from light?
• Chlorophyll!!
HW: Outline the process of photosynthesis
by filling in your copy of the diagram.
• Your book and/or web animations are useful!