Question | Answer |
what is photosynthesis? | The way in which green plants make food |
Photosynthesis transfers light energy into ? | Chemical energy |
What are the factors needed for photosynthesis? | Carbon dioxide,water,light and chlorophyll |
What are stomata? | Tiny openings in leaves in which carbon dioxide pass in through |
What is chlorophyll? | A green dye or pigament produced by plants |
What are the products of photosynthesis? | Gluscose(The food made by a plant) Oxygen(The gas made by photosynthesis) |
What experiment would a person have to carry out to show that starch is made by a plant in photosynthesis? | A plant would be placed nt the dark for 2 days. Soem of the leaves would then be covered with aluminium foil. The plant would then be placed in stong light for a few hours. Then you would test the leaves for starch? |
During the experiment in the previous question,why was the plant in the dark for two days? | It was in the dark for two days because this allows all the starch to be used up so the plant then becomes de-starched |
Why did we cover some of the leaves in aluminium foil? | Aluminium foil blocks out lights and prevents phtosynthesis |
Why was the plant then placed in light for a few hours? | This allowed photosynthesis to take place |
How would a person test leaves for starch | The green leaves would be placed into boiling water to kill and soften the leaves. They would then be placed in hot alcohol to remove chlorophyll. They would then re-softened to removed alochol. Iodine would be adde to the covered and undercovered leaves |
What would be the result for the previous experiment? | Thee uncovered leaves turned blue black indication starch was present. The covered leaves turned red-yellow indicating starch was not present |
Waht is a tropisim? | The change in growthof a plant in response to an outside stiulus |
what is geotropisim? | The change in growth of a plant in response to gravity |