1) The phosphorus cycle begins with phosphorus being released from rocks through weathering processes like rain and wind. 2) Phosphorus enters the soil and is absorbed by plants through their roots, and then moves up the food chain as herbivores eat plants and carnivores eat herbivores. 3) Decomposers like mushrooms and bacteria feed on dead organisms and waste, releasing phosphorus back into the soil to be reabsorbed by plants, completing the cycle. 4) However, human use of phosphorus fertilizers is disrupting the natural cycle by adding excess phosphorus to soils, which is then washed into waterways by rain and causes harmful algal blooms by

1. FROM GROUP 4
OLGA DWI DAMARA 18630029
M RIDHO MAULANA 18630076
HOIRUL ANAM 18630025
PHOSPHORUS CYCLE

2. The Phosphorus Cycle
Start from the
beginning
Make it Rain!
The Producers
The Consumers
The
Decomposers
The Human
Factor
Click the Earth
for video

3. Why is Phosphorus Important?
DNA molecules are made from
three smaller molecules:
(1) Sugar
(2) Nitrogen base
(3) ???
What is the 3rd molecule of
DNA?
Fatty acid
Phosphate
group
Mono-
saccharide
No. Fatty acids are in
lipids.
No. Monosaccharaides
are in carbohydrates.correct
Back Home

4. Why is Phosphorus Important?
ATP is a molecule needed by
cells for _______.
ATP stands for Adenosine
Tri________?
Energy Food
Releasing
CO2
prokaryote
Poly-
saccharide
phosphate
Hint: What does the
mitochondria create?
Hint: What does the
mitochondria create?
correct
Which choice looks like
“phosphorus?”
Which choice looks like
“phosphorus?”
correct
Back Home

5. Why is Phosphorus Important?
Which part of a cell is semi-permeable
and allows some materials to
enter/exit the cell?
The cell membrane is made from a
double layer of lipids called
“phospholipids.” Which element is
implied by the prefix “phospho?”
Mito-
chondria
Cell
membrane
Rough ER
Phosphorus Potassium Plutonium
glucose
glucose
glucose
waste
waste
waste
correct
correct
Hint: What does the
mitochondria create?
Hint: What does the
mitochondria create?
Phospho…cmon! Phospho…cmon!
Back Home
https://www.quora.com/What-is-a-selectively-permeable-membrane

6. Why is Phosphorus Important?
Our cells need phospholipids, DNA, and
ATP. They each have phosphorus in them.
So where does the phosphorus come
from? Phosphorus come from rocks.
Rocks are solid lumps of minerals, and
some of those minerals are phosphorus.
So when rocks crumble and erode,
phosphorus is released from the rocks.
The weather causes rocks to crumble.
Wind, cold, and rain cause dust sized
fragments of rocks to chip off, thus
releasing phosphorus into the ground
Back Home
https://ciaaw.org/phosphorus.htm
https://www.99.co/blog/indonesia/pondasi-batu-kali/

7. Make it Rain!
The weather causes
phosphorus to be released
from rocks. Click the cloud to
make it rain.
Small bits of phosphorus are
released into the ecosystem
due to the weather.
Click the cloud to make it stop
raining.
Now that there is phosphorus
in the soil, click on the land
organism that can absorb it
through their roots.
PPPPPP
Snails don’t
have roots.
Roots…
think roots
Back Home

8. The Producers
Of course! Plants simply
absorb the phosphorus
through their roots. Click on
the roots to proceed.
Now that plants have
phosphorus they can use it to
make their DNA, ATP, and
phospholipids.
Click on the herbivore (primary
consumer) in the diagram.P P
P
P
P
P
Decomposers
feed on the
dead. This
plant is alive.
Back Home

9. The Consumers
Of course! The snail is an
herbivore so it eats the plant.
This is how animals get the
phosphorus to make their
DNA, ATP, and phospholipids.
Phosphorus simply moves up
the food chain. Which
organism would likely eat
snails?
P
P
P
P
P
P
P
PP
Maybe
accidentally, but
cows are
herbivores too.
Wolves are
hunters. I don’t
think they would
hunt snails.
Back Home
https://id.wikipedia.org/wiki/Siput

10. Up the Food Chain
The snail eats the plant…
The frog eats the snail…
Which would likely eat the frog?
You got it. Phosphorus moves up the food chain.
P
P
I’m an
herbivore.
I’m an
herbivore.
P
Back Home

11. The Decomposers
This whole thing started with
crumbling rocks…remember?
Decomposers are organisms
such as mushrooms and
bacteria. They have DNA, ATP,
and phospholipids also, so that
means they need phosphorus
too.
Will decomposers feed on
dead plants?
You got it. Will they feed on
dead snails?
We’re almost done.
PP
P
P
P
P
P
P
P
yes no
P
yes no
Like any organism, decomposers
make waste. They release their
waste into the ecosystem. Some
of their waste even contains
phosphorus.
P
Examine the picture… if
decomposers release phosphorus
into the soil, which organism can
reuse the phosphorus?
The plants
The rocks
The snails
I hope you see why it’s
called the phosphorus
cycle.
Rocks aren’t
organisms
What do snails
eat?
Back Home

12. The Human Factor
Sadly, human actions are disrupting the phosphorus cycle. Humans, like this farmer, routinely
add extra phosphorus to soil because phosphorus is a fertilizer. What do you think the extra
phosphorus does for the farmer’s crops?
P
P
P
P
P
PPPPPP
Kill weeds Kill bugs Stimulates growthNo. Weed killer
kills weeds.
No. Pesticides kill
bugs.
Yes, exactly!
So if phosphorus helps crops grow,
why is this bad?
Back Home

13. Why is this Bad?
The extra phosphorus is intended
to help crops grow better, but often
the phosphorus is washed away
into rivers, lakes, and ponds when
it rains.
P
P
P
P
PP
PThe extra phosphorus got washed
away and is collecting in this pond.
Since the phosphorus is a fertilizer, it
causes algae in the pond to grow at an
extreme rate. These extreme algae
growths are called “algal blooms.” As
the algae eventually die, the decaying
process uses up the oxygen in the
pond, thus all the fish die. Once the
fish die, so does the rest of the
ecosystem.
Make it rainRain Rain Go Away
Back Home

14. Wanna go for a swim?Back Home

15. You can help stop this problem.
Purchasing organic food supports farmers who do NOT use extra fertilizers.
Is There Any Hope?Back Home

16. You can help stop this problem.
Purchasing organic food supports farmers who do NOT use extra fertilizers.
Not using fertilizers in your home garden prevents the spread of excess phosphorus.
Is There Any Hope?Back Home

17. The EndBack Home