Variables: The variables that might affect the rate of photosynthesis in this experiment are: Temperature: When the temperature rises so does the rate of photosynthesis; this is because as the temperature around the plant rises the enzymes controlling photosynthesis inside the chloroplasts heat up and start moving around faster, the fast moving molecules collide with other fast moving enzymes causing them to react....
The rate of photosynthesis of a plant can be affected by more than a factor and by the apparent amount of light that get in touch with the plants. This rate can be controlled by the grower in not as much of a long period of time so as to attain the maximum speed of growth and larger yields of the plants.
21/01/2008 · Why do plants grow with light
Salinity is becoming an increasing problem along waterways, on irrigated land, deserts and other areas, worldwide. Lack of flowing fresh water to flush our rivers, salts and other minerals etc in our water supply, along with other problems, all contribute to this. The plants that grow naturally, and those we plant, can be affected by changes to the natural salinity of their environment, usually in a detrimental way, especially to more sensitive plants.
This informative video goes into the causes of ground salinity and looks at some of the solutions. Well worth watching to gain a better understanding of what is actually going on.
Plants obtain most of their water from the soil, and when that water increases in salinity it takes the plant more energy to draw it up through its roots and the plant can sometimes dehydrate even when there is water available, because it cannot keep up with the effort required to replenish its water supply.
Salt build-up within the plant itself also has effect. This shows more so in older leaves which have had longer exposure to salt excess.
Some of the signs you may see (though not always) that might indicate the salinity is too high for that particular plant are: