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Photosynthesis
Chapter 8
| Question | Answer |
|---|---|
| Photosynthesis | the way that green plants make food |
| a tropism | is a change in growth of a plant in response to a stimulus |
| photosynthesis changes light energy into | chemical energy |
| plants get carbon dioxide | from the air |
| openings called | stomata are found on plants |
| plants get water from | the soil |
| water is carried through the plant in | xylem tubes |
| most photosynthesis takes place in | leaves |
| chlorophyll | is a green chemical used by plants in photosynthesis |
| why are plant leaves covered with foil | so as they cannot photosynthesise and they use up all the starch which is present |
| when testing a leaf for starch why is the leaf dipped into boiling water | this kills and softens the leaf |
| why are leaves soaked in alcohol | to remove the chlorophyll |
| why are leaves dipped into boiling water after chlorophyll is removed | to wash off the alcohol and to soften the leaf |
| if leaves have starch iodine changes from brown yellow to | blue black |
| Phototropism | is the growth of a plant towards light |
| geotropism | is the response of a plant to gravity |
| roots of a plant grow towards | gravity |