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Phototropism

phototropism

(Science: botany) movement or growth of part of an organism (e.g. A plant shoot) towards (positive phototropism) a source of light, without overall movement of the whole organism. An orienting response to light.The directional [[growth of [[meristems in response to the presence of light and the direction it is coming from. Positive phototropism is a directional growth towards the light while a negative response is the organism moving away from the light.


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Movements in Plants

... : due to external stimuli. Types are : 1 Tropic movements 2 nastic movements 3 Haptonastic movements The thing is what is the diff b/w phototactic/phototropism, OR the diff b/w action of Venus fly trap and action of mimosa plant in terms of internal stimulus in mimosa and external stimulus in venus ...

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by cracked_doc
Wed Sep 19, 2007 1:41 pm
 
Forum: Botany Discussion
Topic: Movements in Plants
Replies: 0
Views: 1358

How does the seed know which direction to sprout?

... growing unless they hit an obstacle(and ethylene directs the plant going round it) or there is a unidirectional source of light(case in which phototropism takes over: the stem grows towards the light and the root away from light. However, something that cannot be explained by the current model ...

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by MrMistery
Mon Sep 10, 2007 5:35 pm
 
Forum: Botany Discussion
Topic: How does the seed know which direction to sprout?
Replies: 5
Views: 1513

Black sand????

There is an experiment which is carried out to test the effect of the auxins on the phototropism...i was curious why the stem of the plant is immersed into a beaker half containing fine black sand and a light bulb is set up at the right hand side of the room....pls ...

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by biocupid
Sat Jun 16, 2007 11:43 am
 
Forum: Botany Discussion
Topic: Black sand????
Replies: 1
Views: 743

Black sand????

There is an experiment which is carried out to test the effect of the auxins on the phototropism...i was curious why the stem of the plant is immersed into a beaker half containing fine black sand and a light bulb is set up at the right hand side of the room....pls ...

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by biocupid
Sat Jun 16, 2007 7:54 am
 
Forum: General Discussion
Topic: Black sand????
Replies: 0
Views: 381

Benifits of Blue & Red: Action/Absorption Spectrum, etc

... efficiently (lower action rate due to photons higher energy) *The blue light receptors do a variety of the following: mediate blue light-induced phototropism (circadian rhythms), chloroplast re-localization, opening of the stomatal aperture and stimulates proton pumps that drive protons out of ...

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by bta
Fri Jun 08, 2007 7:34 am
 
Forum: Botany Discussion
Topic: Benifits of Blue & Red: Action/Absorption Spectrum, etc
Replies: 4
Views: 3095
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