The sunflower is an annual plant in the family Asteraceae and native to the America. Sunflowers in the bud stage exhibit heliotropism. At good sunrise, the faces of most sunflowers are turned towards the east. Over the course of the day, they follow the sun from east to west, while at night they return to an eastward orientation. (Taken from www. wikipedia.org and www.flick.com)
Mung bean, also known as green bean, mung, moong, mash bean, munggo or monggo, green gram, golden gram, and green soy, is the seed of Vigna radiata which is native to India. Mung beans are mainly cultivated in India, Indonesia, China, Burma, and Bangladesh. they are grown during two seasons. A model for the pattern of florets in the head of a sunflower was proposed by H Vogel. This is expressed in polar coordinates
,
,where θ is the angle, r is the radius or distance from the center, and n is the index number of the floret and c is a constant scaling factor. It is a form of Fermat's spiral. The angle 137.5° is related to the golden ratio and gives a close packing of florets. This model has been used to produce computer graphics representations of sunflowers.
From www.wikipedia.org
