TITLE: Movement through plants
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What is transpiration?
In which type of cell does most photosynthesis take place?
What is the function of the roots?
Where are the heart pacemaker cells located?
What are statins?
How can faulty heart valves affect somebody's health?
Which three organelles are found only in plant cells?
Explain, in terms of the properties of water, why xylem vessels can
be hollow.
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What is transpiration? The movement of water up a plant.
In which type of cell does most photosynthesis take place? Palisade mesophyll
cells.
What is the function of the roots? To take in water by osmosis and mineral
ions by active transport.
Where are the heart pacemaker cells located? Right atrium.
What are statins? Drugs that lower bad cholesterol in the blood.
How can faulty heart valves affect somebody's health? Blood can flow in the
wrong direction. Could lead to a lack of oxygenated blood, so people may feel
tired.
Which three organelles are found only in plant cells? Cell wall, chloroplasts,
vacuole.
Explain, in terms of the properties of water, why xylem vessels can be hollow.
Water molecules are cohesive, so are drawn up the xylem like a straw.
Today we will focus on answering this 6-mark
question
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Describe the movement of materials up and down the plant. Explain
how the plant is organised to allow this movement.
Which materials need to move around the
plant?
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What is needed for photosynthesis?
What is needed for respiration?
Where do the materials start?
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Water
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Carbon dioxide
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Glucose
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Oxygen
Where do the materials need to go?
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Water
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Carbon dioxide
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Glucose
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Oxygen
Which structures are involved?
Which structures are involved?
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Xylem
Phloem
Root hair cells
Leaves (stomata and spongy mesophyll)
Adaptations of root hair cells
Plants have root hair cells to
increase the amount of water
absorbed via osmosis
Adaptations of xylem
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In pairs, discuss adaptations of xylem vessels.
Adaptations of phloem
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Individually, list the adaptations of phloem vessels.
How is the leaf structure adapted?
8 minutes to answer
Describe the movement of
materials up and down the
plant. Explain how the plant is
organised to allow this
movement. (6 marks)
Peer marking- tick each point made
examples of points made in the response Ions:
(P) taken up by diffusion or active transport
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from an area of high to low concentration (diffusion) or an area of low to high concentration (active transport)
(V) travels in the xylem
(M) to the leaves or from the roots / soil
Water:
(P) taken up by osmosis
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from an area of low to high concentration
allow high concentration of water to low concentration of water
allow from high water potential to low water potential
ignore along a concentration gradient
(V) travels in the xylem
(M) to the leaves or from the roots / soil
(P) transpiration stream
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movement replaces water as it evaporates from leaves
(V) in the xylem
Sugar:
(P) made during photosynthesis
(V) travels in the phloem
(M) to other parts of the plant or to storage organs or travels up and down
Peer marking- give them a mark out of 6
Level 3 (5–6 marks):
Processes used for obtaining specified materials are given.
and
correctly linked to the vessels that the materials are transported in
or
correctly linked to a description of the direction of movement of the materials.
For full credit, in addition to the above descriptors at least one of the processes must be linked to the vessel that the material is
transported in and the direction of the movement of the material.
Level 2 (3–4 marks):
At least one process for obtaining a specified material is given
and
is correctly linked to the vessel that the material is transported in
or
correctly linked to a description of the direction of movement of the material
Level 1 (1–2 marks):
At least one process (P) for obtaining a material is given
or
at least one vessel (V) and the material it carries is given
or
there is a description of the direction of movement (M) for at least one material
8 minutes to answer
Explain how the structure of the leaf is adapted for photosynthesis.
Consider:
1. Which materials are needed for photosynthesis?
2. What are the layers of the leaf?
3. How is each layer related to photosynthesis?