1. Photosynthesis
Lesson 1 – review lesson for structure of a leaf and how its adapted for photosynthesis

2. Complete worksheet using keywords
Settling activity
Complete worksheet using keywords

3. 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

4. INTERGRANAL LAMELLAE

6. 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

8. 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

9. Structure of a leaf Large surface area for light absorption
Label the diagram – how is the leaf adapted to maximise photosynthesis.
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

11. 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.
O I L R I G
What do you understand by this?

12. 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)