Here is a water drop through a plant

1. The JOURNEY OF OF A
WATER DROP THROUGH A
PLANT
By: Youss ef R a sh ad 8B

2. INTRODUCTION
Water is very
important to the
survival of land
plants. Although
plants vary a lot in
their tolerance of
water loss, they all
have their limits,
beyond which
survival is no
longer possible.

3. IMPORTANCE OF WATER TO A
PLANT
Water is essential to plant life. To survive, plants
need water, as well as nutrients, which are
absorbed by the roots from the soil. Plants are 90
percent water. Water is transported throughout the
plant almost continuously to keep its vital
processes working.

4. FIRST STEP
Most of the water absorption is carried out by the younger
part of the roots. Just behind the growing tip of a young
root is the piliferous region, made up of hundreds of
projections of the epidermal tissue, the root hairs.
The narrow walled hairs greatly increase the surface area
over which water absorption can take place. Water in the
soil spaces is taken into the root hairs by the process of
osmosis (the movement of water from a region where
there is a high concentration of water to a region where
water concentration is lower), there being a higher water
concentration outside than within the root hair cells.

5. SECOND STEP
Water molecules move from the soil into living cells of
the root, and eventually into the transport cells of the
xylem, known as tracheids and vessels. These xylem
cells are dead and hollow, allowing rapid water
transport. They also have hardened cell walls to help
them resist the tendency to collapse as water is sucked
through them. Both tracheids and vessels
The route taken by much of the water is through the
cellulose cell walls, the rest of the water either passes
through the cytoplasm of the cells or via the cell
vacuoles.

6. THIRD STEP
Once it reaches the endoderm cells, the water is forced to move through
the cytoplasm. This is because the radial and transverse cell walls of the
young endodermis are impregnated with an impervious material.
The rise of water concentration that exists across the cortex creates a
pushing force called "root pressure"(a pressure that "pushes" the water
across).

7. FOURTH STEP
As transpiration takes place, water diffusing into the air spaces from the
spongy mesophyll cells takes its place. This is turn sets up a
concentration gradient across which water moves by osmosis out of the
xylem cells and across the leaf. A similar concentration gradient occurs
between the xylem and palisade layer so that water will also move by
osmosis to the palisade cells in order that it can be used by these cells in
the food manufacturing process of photosynthesis.

8. THE ROLE OF STOMATA’S IN THE JOURNEY OF
A WATER DROP THROUGH A PLANT.
The transpirational water loss allows for uptake of mineral
nutrients from the soil. However, much of the water loss that
land plants exhibit can be viewed as a "necessary evil." The
stomates must open up to allow for photosynthesis to occur,
and during the process of letting carbon dioxide into the leaf,
water vapor is lost to the atmosphere. When the stomates
close to prevent excess water loss, photosynthesis is
compromised.

9. CONCLUSION
In conclusion to my whole power point here is an overview of what my
powerpoint has just talked about but in summarized format:
1.Roots absorb water from the soil.
2. Then it is carried through the plant. Much of the water is taken up through
the root hairs.
3. Then it is moved up to the endoderm the water moves rapidly to the
cytoplasm This is because the radial and transverse cell walls of the young
endodermis are impregnated with an impervious material.
4. Then lastly the extra water in the plant goes out of the stomata and the
spongy mesophyll cells takes its place