Only happens in plants
carbon dioxide + water (+light energy) ----> glucose + oxygen
Carbon Dioxide: Taken in by the leaves and from respiration
Water: Taken in by the roots
Light Energy: Energy from the Sun is traped by the chlorophyll when needed for phototsynthesis
Glucose: The carbohydrate is made.
Oxygen: Given off as a waste gas
Lack of Light Energy: Slow down the rate of photosynthesis beacause light provides energy for the process. Even on a sunny day, light can be limited on the floor of a wood or rain forest
Temperature: If it is cold the rate is decreased = enzymes in the plant cannot work properly in cold temperatures or very hot temperatures
Lack of Carbon Dioxide: If there is little CO2 the rae will slow down. CO2 can be limited in an enclosed space e.g. in a green house on a hot day and can be caused by a low concentration of CO2 in the air.
There is no point increasing one factor if one is already limited = waste of money!
How Plants use Glucose and Why Plants need Mineral
Glucose is a product of photosynthesis, used in respiration in the plant
It is combined with other nutrients(mineral ions) by the plant to produce new materials
Glucose is soluble but can be stored by some plants as insoluble starch. It is stored as an insoluble substance so that it has no effect on osmosis (it cannot leave the cell) It can be turned back into glucose for respiration
Plant roots take up minerals salts for healthy growth
Nitrates: From soil to produce amino acids - produce proteins for growth
Deficient: Stunted growth
Magnesium ions: Essential for making chlorophyll Deficient: Yellow leaves