Biology B8 - Photosynthesis

Alternative transcript:

As light increases, the rate OF Photosynthesis increases steadily until a certain point. After that point, the temperature or co.level will be the limiting factor. carbon dioxide the amount of CO₂ Will only increase the rate of Photosynthesis UP to a certain point. Temperature at low temperatures, enzyme activity is slowed down due to less Kinetic energy between the enzymes and substrates. But if the plant gets t00 hot. the enzymes Will be denatured. Testing a leaf for Starch: 1. Boiled in water to denture Plant enzymes so no further reactions take place. 2. Boiled in ethanol to remove Chlorophyll so you can see the Colour Change with the iOdine. Test With iodine, Positive result = blue/black colour. Negative result = yellow/brown COLOUR. Making the most Of Photosynthesis: Greenhouses increases the temperature and keeps it relatively constant so this increases the rate of Photosynthesis by providing the optimum temperature for the enzymes involved. Uses artificial lighting to increase light intensity. Grows Plants Which Would not normally grow in outside conditions in the UK e.g. oranges and lemons. clean. UNSPOilt CrOPS Cless insect damage). POLY+unnels- Large greenhouses made of plastic. Cheaper to build and replace than traditional greenhouses. Hydroponics-Plants grow in water With Specific mineral ions rather than in soil. conditions are controlled through computer technology (expensive and fewer Staff needed So LOSS OF Jobs). Crops are clean and soil free. No Preperation of land e.g. PLOUShing. Faster Production due to the points listed above so quicker turnover and high Profits.