Why Do Sunflowers Face the Sun?

Answer

Sunflowers face the sun due to their ability of 'heliotropism' or sun-tracking. Sunflowers have a hydraulic system in the stem which enables them to turn in the direction of the sun. Water builds up on the shady side of the stem, leading to pressure which causes the head to arc toward the light.
Q&A Related to "Why Do Sunflowers Face the Sun"
When sunflowers are growing, their flower heads move from east to west daily, tracking the sun. This tracking is called heliotropism. At night, sunflowers return to face east and
http://www.ehow.com/info_8377652_sunflowers-face-t...
Sunflowers turn to face the sun when they are young and growing fast.
http://wiki.answers.com/Q/Why_do_sunflowers_turn_t...
When the plant is in the bud stage, it tends to track the movement of the sun across
http://www.chacha.com/question/why-do-sunflowers-f...
Most plants do that. It is beneficial for the plants to grow where the sun hits them, because that is where they get their energy from, so over time, plants evolved to do that sort
http://answers.yahoo.com/question/index?qid=201004...
Explore this Topic
Sunflowers have evolved the ability to track the sun with their flower buds. This is why in the mornings, sunflower buds appear to be facing east, but by evening ...
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