Transcript Plant Structure and Photosynthesis

Plant Structure and
Photosynthesis
•Start at the beginning—underground
•Where does soil meet plant?
•At the root hairs—structures that increase
surface area to aid in absorption of water and
minerals needed by the plant
Notice the root hairs
in the region of cell
maturation
(differentiation).
These are extensions
of epidermal cells.
Purpose-increase
surface area in
contact with soil.
• Water (and nutrients) can travel by passive
diffusion within the ground tissue of the cortex.
Once materials reach the endodermis, they must
enter the living part of the cell due to the __________
I get they (roots) absorb water and
nutrients but how do they absorb
nutrients? Some form similar to
osmosis? Yes! Exactly!
QUARKS 1st period
I understand that osmosis moves
nutrients and water to the cortex
from the root epidermis.
QUARKS 1st period
Water can move outside the cell
(red line) along the cell wall or in
the space between cells OR it can
move inside cells (blue line) by
osmosis
I understand that osmosis is involved
in the absorption of water and
nutrients, but what is osmosis?
QUARKS 2nd period
Q: What if the plant absorbs
chemical water? Does it know not
to absorb that? Some are needed!
A: We learned about osmosis in
unit 2 homework #5. Thank you!
QUARKS 4th period
Dude—I just clicked, plants have an
outside layer on their roots called the
epidermis, just like us humans!
John-Anthony former student
I understand that the Casperian strip is
found in the endodermis of root cells,
but was wondering if (it) was found any
where else in the plant and in what type
of tissue? Waterproofing in some areas
of the plant could be useful.
The same waxy substance (suberin) can be
found filling cork cells in the outer bark of
older, woody plants. It is waterproofing!
I get that primary growth is the result
of cells at the tip of roots and secondary growth is the widening. Do both
monocots and dicots go through
secondary growth? Just dicots—and
mostly the woody dicots. Do you see
a connection between the location of
vascular bundles in the fist year and
xylem and phloem in the second year?
Kenzie last year
Eventually the vascular bundles will
make a continuous ring of vascular
tissue. This happens in roots of
dicots also.
In meristematic tissue are the cells kind
of like (human) stem cells because they
haven’t turned (differentiated) into
anything with a specific function?
Saul 2010
Exactly right. They will differentiate
into different cell types.
I studied the parenchyma cell for the
cell project. There are also collenchyma and sclerenchyma cells for
support. Student last year making connections
Here is how one student remem-bers—
Collenchyma collaborative people are
flexible and help support each other (flexible
support for green stems.)
Sclerenchyma thick, rigid…make ground
tissue tough and strong (strict people are
rigid and make you strong)
I understand that dicots produce
secondary growth from meristematic tissue called vascular cambium.
A young dicot first goes through
primary growth, secondary growth
and then is a mature stem.
Big idea from student
I understand that a leaf consists of
spongy mesophyll with air spaces that
connect to the exterior (outside)
through stomata and that each stoma
has two guard cells, controlling the
stoma’s opening and closing.
Chelsea last year
I understand the stomata but do
they only open up for water to enter
the plant?
Conner last year
The main function of the leaf is
photosynthesis. The stoma must
let in CO2 and let out O2 as well as
water vapor so this can happen!
I understood that the stomata
open and close in response to
changes in water pressure within
the guard cells.
Brogan last year
I understood transpiration, but I
don’t understand why being moist
helps gas enter and leave more
easily.
Brian last year
Oxygen (and CO2) dissolves more
easily in a wet environment. Just
the same way you must have a
layer of moisture in your lungs.
Did you notice that
alveoli in your lungs
and spongy mesophyll
in the leaves both
increase surface area?
I understand that stomata open and
close just enough to allow photosynthesis to take place, but do underwater plants that have access to SOO
much water, do those plants leave their
stomata open all day and all night?
Kelsey 2010
Remember, leaves need CO2 and O2 as
well as water for photosynthesis and
water plants have stomata on top only.
How do the
requirements for
photosynthesis
get in to the leaf
and the results
get out?
U: I understand that transportation
is different in plants and leaves. Q:
Why can’t transport be one thing,
not different. Can’t it all work
together at once? Ismeny 2010
It does! Let us see how by building
a model of the transport system in
Plants.
Soil-plant-air
continuum
means a solid
column of water
all the way.
I understand that the tuber allows
the potato plant to store food, but
what kind of food does a potato
store? Sunlight?
Reggie 2010
In a way—yes. Photosynthesis
makes what kind of food? If we
link a bunch together we get…….
GLUCOSE
STARCH is a polymer of glucose!