PHOTOTROPISM for beginners

Produced with CyberLink PowerDirector. that was the program i used, and this is my dialog which I MADE!!: Well... Photo means light, and Tropism is growth in plants from an environmental stimulus. So Phototropism is A plants reaction to light, growing in a certain way and direction.
Growing towards light is known as positive phototropism, and growing away from light is known as negative phototropism. Most plants usually show positive phototropism where as roots usually show the negative kind. Sometimes bind shoots use negative phototropism to climb up dark objects, such as walls, to find more light. Phototropism uses auxin's, which are plant hormones, which have lots of uses. Here they are able to react to light, and break bonds in the cell walls. Making them less rigid. And making them swell up, and creating pressure, causing growth to grow in a different direction. Phototropism is directed by light receptors, such as, cryptochromes that detect blue light, and phytochromes that detect red light.
This normally takes place in the tip of the plant. A scientist once conducted a experiment on this. To do this he took three plants and cut the tips of and placed one in a normal box, and one in the same type of box but put a foil cone on its head , and finally with the last one put it again in the same kind of box but put a hole in the side. This one grew towards the hole, the one with the tin foiled hat on grew straight up and the plain one didn't grow at all. Phototropism is important for the plant as it can find more light and grow taller and taller.

Category:

Education

Tags:

• CyberLink
• PowerDirector
• phototropism
• cryptochrome
• phtochrome
• auxin
• auxins
• weasell
• weasell96
• 96weasel
• EPIC
• FTW

[kamelinea]

yeah, feel much wiser now



[MrAdamHughes15]

I seem to get feedback through my speakers on all of your videos... :L