Download science-10-tropism-and-turgor-pressure

Name:
Phototropism and Gravitropism Fill in the Blank Notes
Main Understandings
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Explain phototropism and gravitropism as examples of control systems in plants
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Explain how our understanding of phototropism and gravitropism has changed over time.
How do plants respond to different stimuli?
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______________________: a growth in
response to a stimuli
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Positive tropism: the plant grows
________________________ the stimuli
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____________________________ tropism:
the plant grows AWAY from the stimuli
What is phototropism?
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When light is the _______________________that the plant responds to
The plant has a hormone called _____________________. This hormone is found in both the roots and the top of the plant
(the shoot) and causes plant growth.
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A high concentration of auxin results in the elongation/ growth of that part of the ____________________!
How does it work? Auxin
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The auxin molecules moves ________________ from the light and
result in cell elongation wherever they move.
Light overhead: auxin moves _______________the stem causing the
stem to grow
Light to the side: the auxin moves away from the light causing that
side to grow and the plant to bend ____________________ the light.
Darwin’s famous experiment
●Cut off the tip it did ______________grow
●Covering the tip, it did not bend.
●Covering the base it ________________.
●Another scientist _____________________________ studies
plants after Darwin.
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Inserted a disk on each side of the plant. Found when it was on
the shady side - phototropism was affected.
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Found when it was in the sunny side it did not affect bending.
Gravitropism
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Roots also have auxins that move based on the root’s position
Root _________________ - the auxin moves down and the BOTTOM SIDE GROWS LESS (this is opposite of auxin in the
shoot).
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Therefore, the top side grows more and it bends _____________________.
Fill in the blank notes Turgor Pressure and Roots
Main Understandings:
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Explain osmosis; diffusion, active transport and root pressure in root hairs
Explain transpiration in plants, cohesion and adhesion as properties of water, and turgor pressure
Recall:
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Where are sugars produced in our plant?____________________
By what process?___________________
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Transported by what?_______________
Where does water leave our
plant?_______________________
But where does water first enter our plant?!
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The _______________!
The roots have tiny little extensions called
_______________ that help absorb water and minerals!
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Water moves into our roots via _______________
The minerals have to be moved into the root cells against
their concentration gradient by ______________________.
Water Then…
Moves up towards the leaves through the ________________!
What was the movement of water out of the leaves called again?______________________
Why else is water important → Turgor Pressure
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Water is why are stems are either firm and straight
up or wilted!
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Turgor pressure is when water moves into our plant
cell pushing the cell ___________ against the cell
____________.
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As a result, the plant is firm or ____________.
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When water moves out of our plant cell, the cell
shrinks and ________!
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Water would move into the cell in a _____________ solution
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Water would move out of the cell in a ____________ solution
Turgor Pressure also affects Guard Cells:
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When the guard cells are turgid, they _____________which
allows gas exchange
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When the guard cells are flaccid or wilted, they
____________ and reduce the amount of water loss and gas
exchange.
Transpiration Summary:
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The process by which water leaves the plant.
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Water enters the plant by the root and root___________cells
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The water leaving the plant pulls on the other water molecules
by ___________________
Then moves up the________________
When it reaches the _________________ it turns to water
vapour and leaves the plant.
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The adhesion of water to the xylem cells helps prevent water
from going back down.
Gas Exchange in plants:
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In sunlight: ___________________
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Carbon dioxide flows
_____________the plant through the
stomata to make sugars. Oxygen leaves
through the_________________.
When it is dark: Plants use ________________
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They use the sugar they made and
_____________ to produce energy.
They then release
__________________.
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Woody Trees/Stems have another way:
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Woody trees and stems also have tissues with pores called ___________________!
Allows for even more gas exchange to occur.