Transcript Settling activity

Photosynthesis
Lesson 1 – review lesson for
structure of a leaf and how its
adapted for photosynthesis
Settling activity
Complete worksheet using
keywords
Learning outcomes
Success criteria
By the end of this lesson I will
know –
• How leaves are adapted to
bring together raw materials
(water, carbon dioxide and
light) for photosynthesis
and remove its products
(oxygen and glucose)
• That chloroplasts
membranes have 2 distinct
regions; thylakoids – are
where the light dependent
stage will take place and the
stroma – where the light
independent stage of
photosynthesis will occur
I will achieve these outcomes
by• Labelling a diagram of a leaf
and chloroplasts
INTERGRANAL LAMELLAE
Starter
• Label the diagram of a chloroplast
• Extension – Write down 2 specific
reasons why photosynthesis is important
to us.
• Existence
• Energy from food or when burning wood.
Coal etc
• Produces oxygen
Chloroplasts
• Disc shaped
• 2-10 um long
• 1 um in diameter
• Double membrane
Inside membranes
- Grana
– 100 disc thylakoids stacked up
- in thylakoids there is the pigment
chlorophyll.
- Light dependent stage of photosynthesis
- Stroma - fluid filled matrix
- within stroma are a no. of starch grains
- Light independent stage of photosynthesis
Structure of a leaf
Label the diagram – how is the leaf adapted to maximise
photosynthesis.
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Large surface area for light absorption
Leaves are arranged to minimise overlapping
Thin – short diffusion distance
Transparent cuticle/epidermis – light can pass
through to photosynthetic mesophyll cells
Long narrow upper mesophylls packed with
chloroplasts
Lots of stomata for gas exchange
Stomata open/close depending on light intensity
Air spaces in lower mesophyll to allow diffusion of
oxygen and carbon dioxide
Xylem network brings water to the leaf
Phloem carries sugars
Oxidation and reduction
• Oxidation and reduction always occur
together. These two process are important
in the understanding of photosynthesis.
• Write down 2 things you understand by the
word oxidation.
• When a substance combines with oxygen =
oxidation. This substance has been
oxidised.
• OIL R IG
• What do you understand by this?
• O xidation
• I s
• L oss of electrons / hydrogen
(gain of oxygen/energy given out)
• R eduction
• I s
• G ain of electrons / hydrogen
(loss of oxygen/energy in)