Science B1 - Photosynthesis (self notes)
- Created by: isabelcornfield
- Created on: 02-02-18 20:56
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- Photosynthesis
- equation for photosynthesis.
- word equation = water + carbon dioxide --->(sunlight) oxygen + glucose.
- (balanced) symbol equation = H2O + 6CO2 -> 6O2 + C6H12O6.
- plants make their own food by photosynthesis.
- photosynthetic organisms e.g. green plants and algae use energy from sun or other source to make glucose.
- some of the glucose makes larger, complex molecules that the plant needs to grow. These make up the plants biomass - mass of living material.
- energy stored in the plants biomass then works its way through the food chain, photosynthic organisms support nearly all life on earth as animals eat them and each other.
- photosynthesis happens inside the chloroplast - they contain chlorophyll which absorbs light . energy is transferred to the chloroplasts by light.
- photosynthesis is an endothermic reaction - energy transferred from the environment during it.
- two main stages: 1) energy transferred by light is used to split water into oxygen gas and hydrogen ions. 2) carbon dioxide gas then combines with the hydrogen ions to make glucose.
- photosynthesis is an endothermic reaction - energy transferred from the environment during it.
- photosynthesis happens inside the chloroplast - they contain chlorophyll which absorbs light . energy is transferred to the chloroplasts by light.
- energy stored in the plants biomass then works its way through the food chain, photosynthic organisms support nearly all life on earth as animals eat them and each other.
- some of the glucose makes larger, complex molecules that the plant needs to grow. These make up the plants biomass - mass of living material.
- photosynthetic organisms e.g. green plants and algae use energy from sun or other source to make glucose.
- key terms.
- diffuse = to move into areas of a lower concentrationof gases from an area of high concentration
- osmosis = the movement of water molecules from areas of high to low concentratio across a semipermeable membrane.
- semipermeable membrane = a type of biological or synthetic, polymeric membrane that allows certain molecules or ions to pass through by diffusion.
- stomata = holes in leaves which carbon dioxide diffuse through.
- carbon dioxide diffuses from the air into the stomata
- diffuse = to move into areas of a lower concentrationof gases from an area of high concentration
- carbon dioxide diffuses from the air into the stomata
- root hair cell = absorbs water from the plant.
- water enters the root hair cells from the soil by osmosis
- osmosis = the movement of water molecules from areas of high to low concentratio across a semipermeable membrane.
- semipermeable membrane = a type of biological or synthetic, polymeric membrane that allows certain molecules or ions to pass through by diffusion.
- osmosis = the movement of water molecules from areas of high to low concentratio across a semipermeable membrane.
- water enters the root hair cells from the soil by osmosis
- equation for photosynthesis.
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