# data[].attributes.body
Glasshouses can be used to optimize the conditions for photosynthesis and therefore increase the amount of growth and yield of the plant. How do they do this?
Why would they do this?

# data[].attributes.headline
Investigating the rate of photosynthesis - variables!

# data[].attributes.subject
Investigating the rate of photosynthesis - variables!

# data[].attributes.body
The rate of photosynthesis is a measure of how quickly it is happening. How can you measure the rate, what do you need
It is necessary to consider your variables when carrying out an investigation!
e.g. I want to investigate the effect of light intensity - what would I have to control? Like

# data[].attributes.body
The stomata are pores located on the underside of a leaf that control the movement of both water and gases in and out of the leaf. The guard cells that surround them control the opening by taking in or losing water.

# data[].attributes.body
Carbon dioxide, as one of the major inputs of photosynthesis, can become a limiting factor in photosynthesis when it is in short supply!

# data[].attributes.body
Waxy cuticle prevents water loss, epidermis (both upper and lower)mar transparent to allow light into palisade cells. Palisade cells contain many chloroplast and carry out photosynthesis. The spongy mesophyll contains air spaces for gas exchange. The vein is made of the xylem (transport water) and the phloem (transport food). The aroma allows gases in and out while the guard cells control the opening and closing of the stoma.

# data[].attributes.body
As temperature increases so too does the rate of photosynthesis. This is because the enzymes controlling the chemical reactions of photosynthesis approach their optimum temperature. Here the temperature is the limiting factor. Once the optimum temperature has been passed, the rate drops because enzymes denature. Temperature is again the limiting factor. When is temperature not the limiting factor?

# data[].attributes.body
Below is an outline for testing a leaf for starch. Why is it necessary to do the following?
1. Destarch the plant
2. Boil the leaf
3. Boil in ethanol
4. Dip in water after boiling
5. Test with iodine, what are the results?

# data[].attributes.attachment_link.title
To Show That Starch Is Made During Photosynthesis

# data[].attributes.headline
Physical adaptations of the leaf for photosynthesis

# data[].attributes.subject
Physical adaptations of the leaf for photosynthesis

# data[].attributes.body
The leaf is the site of photosynthesis and is broad, flat, thin, has veins, chloroplasts and stomata which all allow the leaf to be function in photosynthesis.

# data[].attributes.body
Photosynthesis is the process that plants and other producers use to make food.

Plants need sunlight to provide energy, carbon dioxide to provide carbon and water to produce glucose and to release oxygen (by product!).

Equations (word and chemical are below)

# data[].attributes.headline
Light intensity and rate of photosynthesis

# data[].attributes.subject
Light intensity and rate of photosynthesis

# data[].attributes.body
As you increase light intensity there is an increase in the rate of photosynthesis. At this point light intensity is the limiting factor.

But only until the saturation point is reached. After this point, the rate of photosynthesis does not increase with an increase in light intensity.

At this point, light intensity is no longer the limiting factor, temperature or carbon dioxide ie

# data[].attributes.body
Factors which affect the rate of photosynthesis

# data[].attributes.attachment_link.title
IGCSE 2.10. Rate limiting factors in photosynthesis.  Ms Cooper