how and why does a sunflower follow the sun?

Answer 1

They follow the sun because of growth hormones the plants produce called auxins. Auxins make the plant grow faster and sunlight destroys auxin. So the side in the sun grows slower than the shaded side so it "bends" toward the sun. It's the same thing that happens when you put a plant in a window and it bends toward the window.

Answer 2

Phototropism is a growth movement induced by a light stimulus. Growth towards a source of light is called positive phototropism, that away from the source is termed negative phototropism. The tips of shoots are usually positively, that of roots negatively phototropic.

Originally (with J. v. SACHS, for example) was phototropism called heliotropism, because the plant grows towards the sun. The name was altered when it became clear that plants react also towards artificial sources of light

The amount of light and the phototropic reaction are linked. This connection is known in literature under the terms Bunsen-Roscoe law, product law or reciprocity theorem (FRÖSCHEL and BLAAUW, 1908, BLAAUW, 1909). The Bunsen-Roscoe law states that the product of time and intensity, and thus the energy amount of the used light, is the measure of the stimulus strength. It is thus of no importance whether a light stimulus of low intensity is applied for a longer period of time or whether a stimulus of high intensity is applied for a short time. We know today that the Bunsen-Roscoe law applies only in a very limited sense, since a certain minimal amount of light has to be present in order to trigger the reaction (threshold value), and an increase in light intensity does not always cause an increase in the phototropic reaction, but may in contrast suppress the positive reaction.

Phototropic reactions are characteristic for growing tissues, and are less easily detected in fully differentiated ones. This is on one hand caused by the cells’ loss of plasticity, and on the other hand by the development of mostly inflexible strengthening elements that set a mechanic resistance against each deformation of the tissue. In the shoot axis are they arranged in the periphery thus bringing about an especially high stability.

These facts show that we have stimulus perception, stimulus forwarding, the mechanism of the bending, and experimental data for all three reaction parts, but it is still not understood how these parts are linked. We do not know how the synthesis of the information molecules (the phytohormone auxine) is influenced by the light receptor after stimulation. We do not know either how the decision for a negative or a positive phototropic reaction is made, and we have only rudimentary knowledge about the way in which auxine could stimulate the elongation of the cell walls in the growth zone.

Answer 3

All plants follow the sun , if they are in pots its a good idea to turn them now and then so the dont bend over in one direction.

Answer 4

If you pay attention you will notice all flowers follow the sun, they search and reach for the warmth.

Answer 5

flora tend to 'flow' in direction of easy by way of fact it is an substantial component to the photosynthesis technique, wherein the easy means is converted to chemical means. flora additionally prefer carbon dioxide and water, and supply off oxygen and carbohydrates as by using-products.

Answer 6

they need the energy from the sun

Answer 7

Mine don't they are still in the same place where I planted them

Answer 8

all flowers and trees do not just sunflowers !!!!!!!!!!!! its called GROWING

Answer 9

theyre hungry for attention =P

Answer 10

phototropism