1. How are leaves adapted for photosynthesis?
Lesson 5
How are leaves adapted for photosynthesis?
2.21 Describe the structure of the leaf and explain how it is adapted for photosynthesis
Matching exercise using net – check correct – annotate diagram
Watch video then further discussion about how leaves are adapted – fill in summary
Q from PP
Look at stomata in more detail

2. What makes leaves so good at their jobs?
Why does photosynthesis take place in leaves and not another plant organ?
What makes leaves so good at their jobs?
Collect leaf and paint both sides with nail varnish – leave to dry
Pose these questions
Mix and match exercise – use iPad to help them
Research activity, teach each other
Show me boards for quiz

3. The Leaf
Leaf cut through
Cut end
magnified
Section highly magnified

4. What is needed for photosynthesis. CO2, water, light energy
What is needed for photosynthesis? CO2, water, light energy. Where are they needed? How might they get there?
Products – what happens to them?
Large surface area- Maximise light absorption
Thin- Short distance for carbon dioxide to diffuse into leaf cells
Thin waxy cuticle- This protects the leaves without blocking out light
Thin transparent epidermis- Allows light to reach the palisade cells

5. Label the tissues in the leaf:
Wax cuticle
Palisade mesophyll layer
Lower epidermis
Guard cells
Air spaces
Spongy mesophyll layer
Matching exercise using iPads– check correct
Go over answers
Label diagram
Upper Epidermis
Stoma
Vascular bundle (xylem & phloem)

6. You will be given a tissue to research
Find another person(s) researching that tissue and compare notes. Has anyone missed anything?
Make a group with every tissue present.
Teach peers about your tissue.
Summary
Quiz
The Tissues:
Criteria:
Upper Epidermis
Spongy mesophyll
Function
How is the tissue specialised?
How does this specialisation help it do it’s job effectively?
Palisade Mesophyll
Xylem & Phloem
Stomata & Guard cells
Give each student a tissue to research
Find another person(s) researching that tissue and compare notes. Has anyone missed anything?
Find a group with every tissue present.
Teach peers about your tissue.
Summary note to finish and questions

7. Complete the summary to explain how the leaf is adapted for photosynthesis and gas exchange:
Leaves are especially a__________ to carry out this process. The ______________ cells are packed tightly together towards the top of the leaf to absorb as much ______________ energy as possible. These cells contain many ________________ which contain the green pigment _________________.
On the underside of leaves are tiny pores (holes) called ____________. These are each surrounded by two __________ cells which can open and close the hole. _____________ ____________ can easily diffuse through the stomata into the leaf. The spongy ______________ layer has lots of ____ spaces to allow ___________ to take place as quickly as possible. _________ is transported up the stem and along the branches in ______ vessels which are grouped together in the vascular bundles. __________ is classed as a waste product in photosynthesis and is released into the atmosphere from the ___________.
Word Bank:
Chloroplasts chlorophyll diffusion stomata guard mesophyll
air Carbon dioxide water oxygen glucose adapted palisade Photosynthesis light xylem