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What is the physical basis of the phototropic response in plants?
Tropisms are growthg responses in plants in which the direction of growth depends on the direction of the stimulus. Phototropism is the response to light. The shoots of plants are positively phototropic (grow towards the light) while the roots are negatively phototropic (grow away from light).Experiments carried out in 1880 by Charles Darwin and his son Francis showed that the stimulus was detected by the tip of the shoot but the bending response took place just below the tip.In 1913 the Dutch plant physiologist Boysen-Jensen showed that a chemical substance produced in the tip of the shoot passed to the bending region to cause the response and that this substance passed down the shaded side of the shoot.F. W.Went extracted the growth substance which was identified as auxin. He showed that the phototropic response was due to the unequal distribution of auxin in the shoot. More auxin accumulates on the shaded side of the shoot and causes more rapid cell elongation on that side, so that the shoot bent over towards the light.See related links below
What are the effects of the tropisms caused by light and gravity?
A tropism is a growth response whose direction is determined by the direction of the stimulus. Growth towards the stimulus is called a positive tropism. Growth away from the stimulus is called a negative tropism. The response to light is called phototropism. Shoots are positively phototropic, roots are negatively phototropic. The response to gravity is called gravitropism (or sometimes geotropism). Shoots are negatively gravitropic and roots are positively gravitropic. http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/T/Tropisms.html
Is a plant growing towards light a response or stimulus?
It is a response called phototropism, where the plant grows towards light as a result of the stimulus of light perception.
What is phototaxis?
It is the movement of organism or cell in response to light whether in the direction of light( positive phototaxis) or in the opposite direction ( negative phototaxis). the positive phototaxis is usually occurs in roots of plants whereas the negative photataxis occurs in remaining or outer part of plant in order to get light for photosynthesis.
What is that spot called when you look at a bright light and see a color?
Intense light, such as from a flashbulb or uncovered light bulb, can stimulate the retina (the light-sensitive tissue at the back of the eye) to its maximum response. When this occurs, it takes awhile for the retina to "recover." For a short time you are not able to see well, or you may see spots or a dark afterimage.
Are shoots negatively phototropic?
No, they are positively phototropic as they grow towards light.
What is the physical basis of the phototropic response?
Phototropic response in plants is based on the redistribution of the plant hormone auxin, which promotes cell elongation on the shaded side of the plant, causing it to bend towards the light source. This redistribution is mediated by photoreceptors called phototropins, which sense the direction of light and trigger the movement of auxin to induce the plant's growth towards light.
What is a synonym for phototropic?
Light-seeking.
How is a plant shoot positively photo tropic?
Phototropic is a word to describe if the plant moves towards light sources or away from light sources. Positively phototropic means it moves towards light. Most, perhaps all, plants will grow towards a light source. Plants need light energy so they have evolved to grow in the direction of the best light. Negatively phototropic means it moves away from light. Vampires are known to be negatively phototropic.
How does a plant that is positively phototropic respond to light?
it grows towards the light.
What is the physical basis of the phototropic response in plants?
Tropisms are growthg responses in plants in which the direction of growth depends on the direction of the stimulus. Phototropism is the response to light. The shoots of plants are positively phototropic (grow towards the light) while the roots are negatively phototropic (grow away from light).Experiments carried out in 1880 by Charles Darwin and his son Francis showed that the stimulus was detected by the tip of the shoot but the bending response took place just below the tip.In 1913 the Dutch plant physiologist Boysen-Jensen showed that a chemical substance produced in the tip of the shoot passed to the bending region to cause the response and that this substance passed down the shaded side of the shoot.F. W.Went extracted the growth substance which was identified as auxin. He showed that the phototropic response was due to the unequal distribution of auxin in the shoot. More auxin accumulates on the shaded side of the shoot and causes more rapid cell elongation on that side, so that the shoot bent over towards the light.See related links below
What part of speech is phototropic?
Phototropic is an adjective.
What is a sentence for the word phototropic?
a flower is phototrophic because it is moving toward the sun
What are the effects of the tropisms caused by light and gravity?
A tropism is a growth response whose direction is determined by the direction of the stimulus. Growth towards the stimulus is called a positive tropism. Growth away from the stimulus is called a negative tropism. The response to light is called phototropism. Shoots are positively phototropic, roots are negatively phototropic. The response to gravity is called gravitropism (or sometimes geotropism). Shoots are negatively gravitropic and roots are positively gravitropic. http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/T/Tropisms.html
What is the word for a Plant that grows towards the light?
phototropic (details from another answer) movement of or growth of plant in response to external stimulus. e.g. growth of root towards gravity - geotropism growth of shoot towards the light - phototropism hydrotropism is exhibited by lengthening of roots towards water source and finally, thigmotropism is growth towards solid objects -support by climbers
Are all the plants phototropic?
No,
What has the author David G Heathcote written?
David G. Heathcote has written: 'Investigation of wheat coleoptile response to phototropic stimulations' -- subject(s): Life sciences
