Plant Structure and Photosynthesis

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Plant Structure and Photosynthesis

• Start at the beginningunderground
• Where does soil meet plant?
• At the root hairsstructures that increase
  surface area to aid in absorption of water and
  minerals needed by the plant

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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.
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• Water (and nutrients) can travel by passive
  diffusion within the ground tissue of the cortex.

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Once materials reach the endodermis, they must
enter the living part of the cell due to the
CASPERIAN STRIP.
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I understand that osmosis moves nutrients and
water to the cortex from the root epidermis.
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

• Laurel C. 1st period

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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
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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
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DudeI 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 won-dering
if (it) was found any where else in the plant and
in what type of tissue? Water-proofing in some
areas of the plant could be useful.
John D 3rd period
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The same waxy substance (suberin) can be found
filling cork cells in the outer bark of older,
woody plants. It is waterproofing!
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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 dicotsand 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
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Second year
First year
Eventually the vascular bundles will make a
continuous ring of vascular tissue. This happens
in roots of dicots also.
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In meristematic tissue are they cells kind of
like (human) stem cells because they havent
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 .
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Here is how Jen remembersCollenchyma?
collaborative people are flexible and help
support each other (flexible support for green
stems.) Sclerenchyma? thick, rigidmake ground
tissue tough and strong (strict people are rigid
and make you strong)
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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.
Brogan J. 1st period
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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, con-trolling the
stomas 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
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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!
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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 dont
understand why being moist helps gas enter and
leave more easily. Brian H. 4th period
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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?
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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.
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How do the requirements for photosynthesis get in
to the leaf and the results get out?
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Water in Glucose out Carbon dioxide in Oxygen
out Sunlight in Chlorophyll?
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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 wayyes. Photosynthesis makes what kind of
food? If we link a bunch together we get.
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GLUCOSE
STARCH is a polymer of glucose!
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U I understand that transportation is different
in plants and leaves. Q Why cant transport be
one thing, not different. Cant 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.
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Soil-plant-air continuum means a solid column of
water all the way.