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 CASPERIAN STRIP.
I get they (roots) absorb water and
nutrients but how do they absorb
nutrients? Some form similar to
osmosis? Yes! Exactly!
Devon P. 1st period
I understand that osmosis moves
nutrients and water to the cortex
from the root epidermis.
Laurel C. 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 invol-ved
in the absorption of water and
nutrients, but what is osmosis?
Ben C. 3rd period
Q: What if the plant absorbs chem-ical
water? Does it know not to absorb
that? Some are needed!
A: We learned about osmosis in unit 3
homework #15. Thank you!
Ismeny S. 3rd period
Dude—I just clicked, plants have an
outside layer on their roots called the
epidermis, just like us humans!
John-Anthony 3rd
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.
John D 3rd period
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 first year and xylem and
phloem in the second year?
Kenze M. 3rd period
First year
Second year
Eventually the vascular bundles will
make a continuous ring of vascular
tissue. This happens in roots of
dicots also.
In meristematic tissue are they cells kind of
like (human) stem cells because they haven’t
turned (differentiated) into anything with a
specific function?
Saul C. 7th period
Exactly right. They will differentiate into
different cell types.
I studied the parenchyma cell for my cell
poster. There are also collenchyma and
sclerenchyma cells for support. Jen J 3rd period
.
Here is how Jen remembers—
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
Brogan J. 1st period
mature stem.
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 C. 7th period
I understand the stomata but do they
only open up for water to enter the
plant? Connor R. 7th period
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 J. 1st period
I understood transpiration, but I don’t
understand why being moist helps gas
enter and leave more easily.
Brian H. 4th period
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 SOOOO much water, do those
plants leave their stomata open all day and
all night?
Kelsey M. 4th period
Remember, leaves need CO2 and O2 as
well as water for photosyn-thesis and
water plants have stomata on top only.
How do the
requirements for
photosynthesis
get in to the leaf
and the results
get out?
Water in
Glucose out
Carbon dioxide in
Oxygen out
Sunlight in
Chlorophyll?
I understand that the tuber allows the
potato plant to store food, but what
kind of food does a potato store?
Sunlight?
Reggie D. 7th period
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!
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 S 3rd period
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.