Download Slides on starch testing and uses of glucose File

Which of these photos shows something that has not been built
from glucose?
Today’s learning objectives are…..
What tissues are involved in photosynthesis and the
storage of the products of photosynthesis?
What are the key organs in a plant?
What do plants do with the glucose they make during
photosynthesis?
What factors can limit the rate of photosynthesis?
What factors should be considered when trying to find the
best conditions to grow plants?
What tissues are involved in photosynthesis and the storage
of the products of photosynthesis?
Photosynthesis is….
Link to a short clip explaining the basics of photosynthesis
http://www.bbc.co.uk/learningzone/clips/photosynthesis-inplant-leaves/10605.html
What tissues are involved in photosynthesis and the storage
of the products of photosynthesis?
Remember!
A group of similar
cells working
together
organ
tissue
A group of
different tissues
working together
What tissues are involved in photosynthesis and the storage
of the products of photosynthesis?
Mark the stomata which take gases in and out of the leaf
What other adaptations do the leaves have so all the
mesophyll cells can catch light and obtain water?
What are the key organs in a plant?
3 organs in a plant
What do plants do with the glucose they make?
Carbon dioxide + water
light
glucose
+ oxygen
Used in respiration
What do plants do with the glucose they make?
Carbon dioxide + water
light
glucose
+ oxygen
(used to build the
cellulose cell walls
of new cells)
No new cells, no growth
What do plants do with the glucose they make?
Carbon dioxide + water
light
glucose
+ oxygen
(stored as
fats or oils)
Culturing algae to use as biofuel
http://www.youtube.com/watch?v=
1MeIgaRfyD4
What do plants do with the glucose they make?
Carbon dioxide + water
light
glucose
+ oxygen
Combined with nitrate
to form proteins
Can you give 2 examples of plant materials that contain proteins?
What do plants do with the glucose they make?
Carbon dioxide + water
light
glucose
+ oxygen
Stored as starch
Can you give 2 examples of plant materials that contain starch?
Areas where the plant is making starch stain black
1. What does the plant make starch from?
2. What does the plant need to make glucose?
3. Why do only some
parts contain starch?
Is chlorophyll needed for
photosynthesis?
In variegated plants only the green
parts contain chlorophyll.
Which areas will not be able to photosynthesise?
Starch only found where photosynthesis takes place
What do plants do with the glucose they make?
Proteins
Cellulose
Starch
Energy / respiration
Fats & oils
Plants
Can
Store
Energy as
Fat
What do plants do with the glucose they make?
Proteins
Cellulose
Starch
Energy / respiration
Fats & oils
All these products are transported from
the leaves to other parts of the plant in
special tubes called phloem.
Xylem tubes take water up to the leaves
Some parts of the plant are specialised to store sugar as starch
When the sugar is needed the starch is broken down
What do plants do with the glucose they make?
Carbon dioxide + water
light
glucose
+ oxygen
(used to build the
cellulose cell walls
of new cells)
No new cells, no growth
What can a grower do to speed up algal/ plant growth?
light
Carbon dioxide +
water
glucose
+ oxygen
If you kept on increasing any of these
things what would happen to growth?
Plant
growth
Increasing light, CO2 or temp.
A student used the equipment shown to measure the effect of light
intensity on the rate of photosynthesis. She counted the number of
bubbles of gas given off each minute and plotted her results on a graph
1. Describe the pattern
shown in the graph
2. The student said
“increasing the light level
increases the rate of
photosynthesis”. Why was
this statement incomplete?
Limiting factors
The rate of photosynthesis is limited by …… levels of light or CO2
The rate of photosynthesis is limited by …… or ……. temperatures
Limiting factors
A limiting factor prevents a reaction speeding up.
The 3 factors which can limit photosynthesis in plants are
light
O2
CO2
glucose
Temperature
Which factor is most likely to limit photosynthesis at
a) Noon on a summer’s day?
b) Noon on a winter’s day?
c) Dusk on a summer’s day?
Is it worth changing growing conditions to improve photosynthesis?
Many commercial plant growers try to increase
the “yield” (how much plant they have to sell) by
changing growing conditions.
•Change one factor at a time
•Measure how growth is affected
•Decide if change is cost effective
What are the advantages and disadvantages of
manipulating the environment crops are grown in?
Growing plants in
polytunnels
Using heaters inside
a greenhouse
Adding carbon
dioxide to the air
plants grow in