1. IT’S A GREEN WORLD
Who planted that there?

2. Starter
Would a plant survive if it had a mutation of:
Leaves with only a red pigment
Leaves like footballs
Leaves with no stomata

3. Who planted that there? Learning outcomes Success criteria
Describe the entry and exit points of materials required for photosynthesis.
Explain how leaves are adapted for efficient photosynthesis.
Be able to design different types of leaves, demonstrating their adaptations for particular environmental conditions

4. Photosynthesis - Brainpop.swf

5. Photosynthesis: word equation
light energy
carbon
dioxide
water
glucose
oxygen
chlorophyll
light
energy
chlorophyll
carbon
dioxide
oxygen
Students to copy word equation
glucose
water

6. Photosynthesis
Carbon dioxide enters and oxygen leaves the leaf through small pores on the underside of the leaf – stomata.
Water enter the plant through the root hairs.
Glucose is stored by the plant as starch

7. Testing leaves for starch – procedure
This four-stage virtual experiment demonstrates how iodine can be used to test for starch. It could be used as a precursor to running the practical in the lab, or as a revision exercise.
Suitable prompts include:
Stage 1: Why is the leaf placed in boiling water?
Stage 2: What does the warm alcohol do to the leaf?
Stage 3: Why is the leaf placed in warm water?
Stage 4: What colour change occurs if starch is present?

8. Leaves: maximizing photosynthesis
Leaves are the most efficient solar panels on Earth!
Why can they be called this?
Light energy is absorbed
by the chlorophyll in leaves and used to carry out photosynthesis.
Leaves come in all shapes and sizes but what features do they have in common
to maximize photosynthesis?

9. Structure of a leaf
How are leaves designed to maximize photosynthesis?
Leaves are wide and flat
to create a large surface
area and to absorb
as much light as possible.
Leaves are thin so gases
can reach cells easily.
Leaves contain lots of chloroplasts which contain the green pigment chlorophyll.
Students to take notes
Leaves have holes, called stomata, on their underside through which gases move in and out.
Leaves have lots of veins to carry water to the cells and carry glucose away.

10. Autumn leaves
Leaves on deciduous trees change colour in autumn because the trees absorb the green pigment from the chloroplasts.
Because leaves are specially adapted to carry out photosynthesis many cannot survive winter frosts and drop off the trees.

11. Although leaves do the same basic job, they also have to adapt to their environment and balance a range of needs.

12. Designing leaves Label them with explanations.
withstand strong winds live in fast-flowing rivers
live in a shady environment live in a hot dry environment
Label them with explanations.
Construct a palisade cell out of plasticine

13. Plenary

14. Who planted that there? Learning outcomes Success criteria
Describe the entry and exit points of materials required for photosynthesis.
Explain how leaves are adapted for efficient photosynthesis.
Be able to design different types of leaves, demonstrating their adaptations for particular environmental conditions