1. The Leaf and Photosynthesis

2. ·bonds made, storing energy
PHOTOSYNTHESIS
·process where energy from sunlight ("photo") is used to make ("synthesis") food (glucose, a carbohydrate)
·light energy chemical energy
·bonds made, storing energy

3. What kind of reaction is this?
Photosynthesis equation:
carbon
dioxide
water
glucose
oxygen +
sunlight
chlorophyll
HIGH ENERGY
LOW ENERGY
What kind of reaction is this?

4. What parts of the plant are involved in the reaction?
carbon
dioxide
water
glucose
oxygen +
sunlight
chlorophyll
6 CO2
C6H12O6 +
6 O2 +
6 H2O
from air
via stomata
in leaves
from soil
via roots
stored as
starch in leaves
released to air via stomata in leaves

5. Where in the plant cell does this process occur?

6. Contain green photoreceptor pigment, chlorophyll.
Chloroplasts
Contain green photoreceptor pigment, chlorophyll.
Found in the ground tissue of leaves and stems.
The site of photosynthesis

8. Chloroplasts Photosynthesis mainly happens in the leaves of plants.
What 4 things does a leaf need to perform photosynthesis?
Sunlight, water, CO2, chlorophyll
Chloroplasts are a membrane bound organelle that carries out photosynthesis.
Sunlight, water, co2, chlorophyll

9. Chloroplasts Found in leaves, and unripened fruit.
These are the only areas that can perform photosynthesis.
Has an outer and an inner membrane that hold the chloroplast together.

10. Chloroplasts The medium inside the chloroplast is called the stroma.
The stroma is filled with proteins, and is a very thick almost solid liquid.

11. Cytoplasmic Streaming
·Movement of the cytoplasm and its contents
·Circulates materials throughout the cell
·First seen by Robert Hooke
·Chloroplasts move this way in reaction to light

12. Let's examine the special conditions required for the photosynthesis reaction:

13. Is chlorophyll sensitive to all the colours of the spectrum?
LIGHT ENERGY AND PHOTOSYNTHESIS
Light energy travels in waves. Sunlight is white light, which is a combination of all the colours of the rainbow.
The different colours are: Red
Orange
Yellow
Green
Blue
Indigo
Violet
Is chlorophyll sensitive to all the colours of the spectrum?

14. Chlorophyll absorbs energy from the blue and red regions of the light spectrum, and reflect (absorb almost none) of the yellow and green light

15. How is the leaf perfectly designed to maximize exposure to light?
Where exactly is the light reaction occurring?

16. Photosynthesis
Photosynthesis can be broken down into two separate reactions
Light reaction
Energy and oxygen are made in this reaction
Dark reaction
Glucose is made in this reaction

17. ·What kind of reaction is cellular respiration?
·For energy that cells can use to function
·Energy released by breaking bonds
·Occurs in both cytoplasm and mitochondria
C6H12O6(aq) + 6O2(g) 6CO2(g) + 6H2O(l)
·What kind of reaction is cellular respiration?
The inner membrane is the site of
many cell resp reactions - why is it so folded?

18. Comparing Photosynthesis and Cellular Respiration