B8 Photosynthesis Flashcards
Word equation for photosynthesis
Light
Carbon dioxide + water = glucose + oxygen
Chlorophyll
Endo or exothermic
Endothermic
Process
Energy is transferred to the green chloroplasts that contain chlorophyll and they absorb the light energy and converted into chemical energy.
How to plants use Glucose
For respiration, making cellulose, making amino acids by combining them with nitrate ions, stored as oil or fats in seeds, stored as starch in roots, stems and leaves
Light intensity is proportional to
1
Distance (d)2
Why are light intensity and distance inversely proportional to each other.
Because as distant increases light intensity decreases decreasing the rate of photosynthesis.
Factors that affect the rate of photosynthesis
Temperature, Carbon Dioxide concentration, Light intensity, Chlorophyll levels in the leaf.
Two sources of error in the practical
Counting bubbles is mot precise enough. Thermal energy from the lamp may escape
Two ways the experiment could be improved
Measure light intensity as the dependant variable. Use stem bubble only. Use a LED lamp Use rate of photosynthesis.
How can you maximise the rate of photosynthesis in farming and agriculture?
Control the limiting factors and whilst maintaining profit- commercial reasoning. Use a greenhouse or a paraffin heater. Artificial lights.
How to increase C02 in a greenhouse
Paraffin heater as it makes C02 as a by product
How to decrease temperature in a greenhouse
Shades and ventilation
