Vegetation Transformation: Crash Course Kids #5.2 - By Crash Course Kids
Transcript
| 00:09 | Have you ever seen someone do a presto change o | |
| 00:11 | trick ? Some of the living things that you see | |
| 00:13 | every day also do a pretty impressive changing act . | |
| 00:16 | No props require you probably already know that all living | |
| 00:19 | things need energy to grow and to survive . And | |
| 00:22 | that plants are one of the few kinds of living | |
| 00:25 | things that can change light energy into chemical energy in | |
| 00:28 | the form of sugar . But if it's not magic | |
| 00:31 | then how do they do it ? How do plants | |
| 00:33 | change light energy into chemical energy ? The the answer | |
| 00:41 | . A word that kind of sounds like a magic | |
| 00:43 | spell . Photosynthesis . Let's take a closer look at | |
| 00:47 | a plant to track down exactly what photosynthesis is all | |
| 00:50 | about . While we're exploring , we'll use a diagram | |
| 00:53 | to show what's going on inside . Ever wonder why | |
| 00:55 | plants are green . Their cells contain a green colored | |
| 00:58 | chemical called chlorophyll . The chlorophyll is found in special | |
| 01:02 | mini containers called chloroplasts . When the sun shines on | |
| 01:05 | a plants leaf , the green chlorophyll inside the cell | |
| 01:08 | grabs that light energy and uses it to change water | |
| 01:11 | and a gas called carbon dioxide into sugar . Another | |
| 01:13 | gas oxygen is released back into the air . So | |
| 01:16 | stop . Take a deep breath and thank of plants | |
| 01:19 | . Why ? Because most of the oxygen in the | |
| 01:21 | air around you right now . Is there because of | |
| 01:24 | photosynthesis ? And this is really convenient because you , | |
| 01:27 | me and all other animals on earth count on that | |
| 01:31 | oxygen to breathe . Plus bonus since animals can't do | |
| 01:35 | photosynthesis , they can get energy by eating the plants | |
| 01:38 | and all of the delicious sugar they made during photosynthesis | |
| 01:42 | . It's a two for one . So how do | |
| 01:44 | we know that light is what's so important for photosynthesis | |
| 01:47 | ? Well , we can tell by doing an experiment | |
| 01:49 | using two plants as a model , mm hmm . | |
| 01:55 | These are both the same type of plant with the | |
| 01:57 | same amount of soil . We'll put one plant in | |
| 01:59 | the dark for a few days and one in the | |
| 02:01 | light , making sure that both plants get the same | |
| 02:04 | amount of water and are kept at the same temperature | |
| 02:06 | just to keep things fair now , what do you | |
| 02:08 | think will happen ? Right . The one that's been | |
| 02:11 | in the dark sure doesn't look too healthy . That's | |
| 02:13 | because there wasn't any sun light to drive photosynthesis without | |
| 02:17 | photosynthesis . The plant can't make any sugar . No | |
| 02:20 | sugar means no energy and no energy means a droopy | |
| 02:24 | tired looking plant . So photosynthesis is how plants use | |
| 02:31 | a chemical called chlorophyll to capture the sun's energy . | |
| 02:35 | They use this energy to change carbon dioxide and water | |
| 02:38 | to chemical energy in the form of sugar . This | |
| 02:41 | sugar , along with the oxygen that's released , is | |
| 02:44 | used by animals to survive . And that's a change | |
| 02:47 | . We can all live with |
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