the solar tracking of sunflower in accordance with the path of sun is due to
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The solar tracking of sunflower in accordance with the path of sun so that they face the sun and receive the necessary energy is termed as heliotropism.
It is a complex response of the plant in which the shoot apex changes its position continuously according to the position of the sun so that the developing heads receive the direct rays of the sun.
At night, the phenomenon is just the reverse in which the heads return to their original position , towards east getting ready for dawn.
The solar tracking of sunflower in accordance with the path of sun is due to the hormone called as Auxin. The sunflower plant contains hormones called Auxin. These hormones are delicate to daylight and do all that they can to look for shade. Thus, they relocate from the piece of the plant washed in daylight to the shaded area in the stem. Once there, the Auxin (which is basically development hormones) invigorates the development of cells. This makes the stem wind up bulkier in the shaded locale, so the blossom winds up twisting the other way - towards the Sun. As the Sun moves over the sky, the Auxin likewise keep on moving to the piece of the stem that is shaded, constantly making the shaded part bulkier by animating cell development. That is the manner by which the sunflower keeps on confronting the Sun - continually twisting far from the bulkier piece of the stem.