Auxins (plural of auxin /ˈɔːksᵻn/) are a class of plant hormones (or plant growth substances) with some morphogen-like characteristics. Auxins have a cardinal role in coordination of many growth and behavioral processes in the plant's life cycle and are essential for plant body development. Auxins and their role in plant growth were first described by the Dutch scientist Frits Warmolt Went.Kenneth V. Thimann isolated this phytohormone and determined its chemical structure as indole-3-acetic acid (IAA). Went and Thimann co-authored a book on plant hormones, Phytohormones, in 1937.
Overview
Auxins were the first of the major plant hormones to be discovered. They derive their name from the Greek word αυξειν (auxein - "to grow/increase").
Auxin (namely IAA) is present in all parts of a plant, although in very different concentrations. The concentration in each position is crucial developmental information, so it is subject to tight regulation through both metabolism and transport. The result is the auxin creates "patterns" of auxin concentration maxima and minima in the plant body, which in turn guide further development of respective cells, and ultimately of the plant as a whole.
This video covers:
- The idea that plants respond to their surroundings just like animals do
- But that plants use local hormones rather than a nervous system
- How auxins enable plants to respond to light (phototropism) and gravity (geotropism or gravitropism)
Exam board specific info:
AQA - Separate/triple science only
IGCSE Edexcel - Everything is relevant to your course!
Edexcel - Separate/triple science only
OCR 21st Century - Separate/triple science only
OCR Gateway - Separate/triple science only
Maths Playlist:
https://www.youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh
GCSE Chemistry playlist:
https://www.youtube.com/watch?v=fN8kH9Vvqo0&list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W
GCSE Biology Playlist:
https://www.youtube.com/watch?v=--dIBinUdeU&list=PLidq...
Plant Growth: Auxins and Gibberellins | Plants | Biology | FuseSchool
If a plant has enough water, minerals and energy, it will grow, right? Well, sort of… but there is more to it - like why do plants bend towards the light and not just grow straight? And why does the stem grow up but the roots grow down? It isn’t as if a plant has eyes to tell it where the sun is.
Plants are packed full of hormones, sending messages around to its different parts. Where humans have the creatively named ‘growth hormone’, plants have hormones called auxins.
Auxin is produced in the stem tips and roots, and controls the direction of growth in response to different stimuli including light and gravity. Having been made in the tips of the stems and roots, auxin is moved in solution by diffusion to older par...
Animation 15.7 Effects of auxin concentration on the growth of shoots and roots
published: 27 May 2021
Mechanisms of Plant Growth
We've gone over the various tiers of structure of a plant, from cells, to tissues, to organs and organ systems. Now it's time to better understand how plants grow. How to plants know when to grow? How do they know which direction to grow? All of this is regulated by plant hormones, which are signaling molecules, just like the ones that we have in our bodies, though they are totally different molecules than ours. Auxin, cytokinin, gibberellins, abscisic acid, and ethylene, what do these molecules do? What is gravitropism? What is phototropism? Let's learn all this and more!
Script by Sheryl Hosler
Watch the whole Botany playlist: http://bit.ly/ProfDaveBotany
General Chemistry Tutorials: http://bit.ly/ProfDaveGenChem
Organic Chemistry Tutorials: http://bit.ly/ProfDaveOrgChem
Biochemistry ...
published: 07 Oct 2020
Major plant hormones (& how to remember) | Control & Coordination | Biology | Khan Academy
Let's learn the 5 major plant hormones and how we can remember their functions.
More free lessons & practice -https://www.khanacademy.org/science/class-10-biology/in-in-control-and-coordination
Khan Academy is a nonprofit organisation with the mission of providing free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every ...
published: 03 Oct 2019
Discovery of Auxin
This is a quick short animated video on the Discovery of Auxins and its effect on plants. The classical experiments that led to the discovery of auxin have been discussed in detail.
published: 11 Aug 2021
GCSE Biology - Plant Hormones - Uses of Auxin, Gibberellin and Ethene #53
This video covers:
- How we can use plant hormones to control growth in plants
- How we can use Auxins to stimulate plants to grow, or kill weeds
- Uses of Gibberellin to control dormancy, induce flowering and grow larger fruit
- How we can use ethene to control the ripening of fruit
Exam board specific info:
AQA - Separate/triple and higher tier only
IGCSE Edexcel - Not in your course
Edexcel - Separate/triple and higher tier only
OCR 21st Century - Separate/triple and higher tier only
OCR Gateway - Separate/triple and higher tier only
Maths Playlist:
https://www.youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh
GCSE Chemistry playlist:
https://www.youtube.com/watch?v=fN8kH9Vvqo0&list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W
GCSE Biology Playlist:
https://www.youtu...
published: 01 Mar 2020
Akad of Izyan & Syahiran | 16 Dec 2023
Tahniah Izyan dan pasangan Syahiran! semoga hubungan dan cinta kalian kekal ke syurga ameeen
Teaser Wedding of Izyan & Syahiran : https://youtu.be/s_xHVh26R28
Full Wedding of Izyan & Syahiran : https://youtu.be/mDTchF9OYN0
Lokasi : Kota Bharu
thank you guna servis kami 🥰
---------------------------------------------
untuk sebarang tempahan servis boleh tekan di sini https://linktr.ee/auxinfilm thank you!
published: 29 Dec 2023
Auxins - Plant Growth Regulators
This video explains, how Auxin functions as growth regulators with the simple experiment?
Auxin was the first plant growth hormone invented by the scientist. It is the primary growth hormone of plants.
This hormone plays a vital role in primary plant development. It controls the vertical and lateral growth in roots and in shoots. They are also responsible for all the process that takes place in plants before the cell differentiation.
This video covers:
- The idea that plants respond to their surroundings just like animals do
- But that plants use local hormones rather than a nervous system
...
This video covers:
- The idea that plants respond to their surroundings just like animals do
- But that plants use local hormones rather than a nervous system
- How auxins enable plants to respond to light (phototropism) and gravity (geotropism or gravitropism)
Exam board specific info:
AQA - Separate/triple science only
IGCSE Edexcel - Everything is relevant to your course!
Edexcel - Separate/triple science only
OCR 21st Century - Separate/triple science only
OCR Gateway - Separate/triple science only
Maths Playlist:
https://www.youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh
GCSE Chemistry playlist:
https://www.youtube.com/watch?v=fN8kH9Vvqo0&list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W
GCSE Biology Playlist:
https://www.youtube.com/watch?v=--dIBinUdeU&list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g
GCSE Physics Playlist:
https://www.youtube.com/watch?v=aHVJfRxeAxo&list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7
This video covers:
- The idea that plants respond to their surroundings just like animals do
- But that plants use local hormones rather than a nervous system
- How auxins enable plants to respond to light (phototropism) and gravity (geotropism or gravitropism)
Exam board specific info:
AQA - Separate/triple science only
IGCSE Edexcel - Everything is relevant to your course!
Edexcel - Separate/triple science only
OCR 21st Century - Separate/triple science only
OCR Gateway - Separate/triple science only
Maths Playlist:
https://www.youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh
GCSE Chemistry playlist:
https://www.youtube.com/watch?v=fN8kH9Vvqo0&list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W
GCSE Biology Playlist:
https://www.youtube.com/watch?v=--dIBinUdeU&list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g
GCSE Physics Playlist:
https://www.youtube.com/watch?v=aHVJfRxeAxo&list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7
Plant Growth: Auxins and Gibberellins | Plants | Biology | FuseSchool
If a plant has enough water, minerals and energy, it will grow, right? Well, sort of… but...
Plant Growth: Auxins and Gibberellins | Plants | Biology | FuseSchool
If a plant has enough water, minerals and energy, it will grow, right? Well, sort of… but there is more to it - like why do plants bend towards the light and not just grow straight? And why does the stem grow up but the roots grow down? It isn’t as if a plant has eyes to tell it where the sun is.
Plants are packed full of hormones, sending messages around to its different parts. Where humans have the creatively named ‘growth hormone’, plants have hormones called auxins.
Auxin is produced in the stem tips and roots, and controls the direction of growth in response to different stimuli including light and gravity. Having been made in the tips of the stems and roots, auxin is moved in solution by diffusion to older parts of the plant. In the stem, the auxin causes the cells to change in elasticity. More elastic cells absorb more water, and can grow longer.
Strangely, though, stems and roots respond differently to high concentrations of auxins. Whilst the stem cells grow more, the root cells actually grow less. So auxins make plants grow, but why do they bend towards the light? How do they know to do this when they don’t have eyes?
The bending happens because the light hits the one side more and breaks down the auxins in that side of the stem. So then growth slows down on the ‘light’ side. The faster growth on the ‘dark’ side causes the shoots and leaves to turn towards the light - which is ideal for the plant for photosynthesis.
Auxin is produced in the tips of growing shoots. If the tips are cut off, then no auxin can be produced and so no plant growth. If the tips are covered, whilst auxin is still produced, light cannot break it down and so phototropism cannot occur: the plant just grows straight up and does not bend towards the light.
Auxins have the opposite effect on root cells. In roots, auxins cause less growth. The shaded side of roots contain more auxins, and so they grow less. This enables the ‘light’ side of the roots to grow more and bend away from the light.
And if that wasn’t weird enough, we have opposites happening with auxins and gravity too. In a horizontal root, the bottom side contains more auxins and grows less, so the root bends downwards in the direction of gravity. So positive geotropism. But of course, the stem responds differently.
In a horizontal stem, again the bottom side contains more auxins because it is less directly hit by sunlight. But because auxins cause growth in stems, the bottom side grows more causing the stem to bend upwards, against the direction of gravity, so negative geotropism.
But I am giving auxins too much credit; they don’t work alone. They have a partner in crime; cytokinins. You don’t need to know anything about these hormones other than the fact that they work alongside auxins. There is another plant hormone that you do need to be aware of… Gibberellins.
Once a seed germinates, the roots and shoots start to grow. But for this, the seed needs energy. Luckily, the seed releases a hormone called gibberellin which causes the starch in the seed to turn into sugars and provide the seed with energy to grow. As well as causing shoot growth, gibberellins can also stimulate flowering and fruits in some plants. And they also work with auxins to cause stem elongation.
SUPPORT US ON PATREON
https://www.patreon.com/fuseschool
SUBSCRIBE to the FuseSchool YouTube channel for many more educational videos. Our teachers and animators come together to make fun & easy-to-understand videos in Chemistry, Biology, Physics, Maths & ICT.
VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders, and to see what else we have on offer. Comment, like and share with other learners. You can both ask and answer questions, and teachers will get back to you.
These videos can be used in a flipped classroom model or as a revision aid.
Find all of our Chemistry videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlReKGMVfUt6YuNQsO0bqSMV
Find all of our Biology videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlQYSpKryVcEr3ERup5SxHl0
Find all of our Physics videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlTWm6Sr5uN2Uv5TXHiZUq8b
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Facebook: https://www.facebook.com/fuseschool/
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Access a deeper Learning Experience in the FuseSchool platform and app: www.fuseschool.org
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This is an Open Educational Resource. If you would like to use the video, please contact us: [email protected]
Plant Growth: Auxins and Gibberellins | Plants | Biology | FuseSchool
If a plant has enough water, minerals and energy, it will grow, right? Well, sort of… but there is more to it - like why do plants bend towards the light and not just grow straight? And why does the stem grow up but the roots grow down? It isn’t as if a plant has eyes to tell it where the sun is.
Plants are packed full of hormones, sending messages around to its different parts. Where humans have the creatively named ‘growth hormone’, plants have hormones called auxins.
Auxin is produced in the stem tips and roots, and controls the direction of growth in response to different stimuli including light and gravity. Having been made in the tips of the stems and roots, auxin is moved in solution by diffusion to older parts of the plant. In the stem, the auxin causes the cells to change in elasticity. More elastic cells absorb more water, and can grow longer.
Strangely, though, stems and roots respond differently to high concentrations of auxins. Whilst the stem cells grow more, the root cells actually grow less. So auxins make plants grow, but why do they bend towards the light? How do they know to do this when they don’t have eyes?
The bending happens because the light hits the one side more and breaks down the auxins in that side of the stem. So then growth slows down on the ‘light’ side. The faster growth on the ‘dark’ side causes the shoots and leaves to turn towards the light - which is ideal for the plant for photosynthesis.
Auxin is produced in the tips of growing shoots. If the tips are cut off, then no auxin can be produced and so no plant growth. If the tips are covered, whilst auxin is still produced, light cannot break it down and so phototropism cannot occur: the plant just grows straight up and does not bend towards the light.
Auxins have the opposite effect on root cells. In roots, auxins cause less growth. The shaded side of roots contain more auxins, and so they grow less. This enables the ‘light’ side of the roots to grow more and bend away from the light.
And if that wasn’t weird enough, we have opposites happening with auxins and gravity too. In a horizontal root, the bottom side contains more auxins and grows less, so the root bends downwards in the direction of gravity. So positive geotropism. But of course, the stem responds differently.
In a horizontal stem, again the bottom side contains more auxins because it is less directly hit by sunlight. But because auxins cause growth in stems, the bottom side grows more causing the stem to bend upwards, against the direction of gravity, so negative geotropism.
But I am giving auxins too much credit; they don’t work alone. They have a partner in crime; cytokinins. You don’t need to know anything about these hormones other than the fact that they work alongside auxins. There is another plant hormone that you do need to be aware of… Gibberellins.
Once a seed germinates, the roots and shoots start to grow. But for this, the seed needs energy. Luckily, the seed releases a hormone called gibberellin which causes the starch in the seed to turn into sugars and provide the seed with energy to grow. As well as causing shoot growth, gibberellins can also stimulate flowering and fruits in some plants. And they also work with auxins to cause stem elongation.
SUPPORT US ON PATREON
https://www.patreon.com/fuseschool
SUBSCRIBE to the FuseSchool YouTube channel for many more educational videos. Our teachers and animators come together to make fun & easy-to-understand videos in Chemistry, Biology, Physics, Maths & ICT.
VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders, and to see what else we have on offer. Comment, like and share with other learners. You can both ask and answer questions, and teachers will get back to you.
These videos can be used in a flipped classroom model or as a revision aid.
Find all of our Chemistry videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlReKGMVfUt6YuNQsO0bqSMV
Find all of our Biology videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlQYSpKryVcEr3ERup5SxHl0
Find all of our Physics videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlTWm6Sr5uN2Uv5TXHiZUq8b
Find all of our Maths videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlTKBNbHH5u1SNnsrOaacKLu
Instagram: https://www.instagram.com/fuseschool/
Facebook: https://www.facebook.com/fuseschool/
Twitter: https://twitter.com/fuseSchool
Access a deeper Learning Experience in the FuseSchool platform and app: www.fuseschool.org
Follow us: http://www.youtube.com/fuseschool
Befriend us: http://www.facebook.com/fuseschool
This is an Open Educational Resource. If you would like to use the video, please contact us: [email protected]
We've gone over the various tiers of structure of a plant, from cells, to tissues, to organs and organ systems. Now it's time to better understand how plants gr...
We've gone over the various tiers of structure of a plant, from cells, to tissues, to organs and organ systems. Now it's time to better understand how plants grow. How to plants know when to grow? How do they know which direction to grow? All of this is regulated by plant hormones, which are signaling molecules, just like the ones that we have in our bodies, though they are totally different molecules than ours. Auxin, cytokinin, gibberellins, abscisic acid, and ethylene, what do these molecules do? What is gravitropism? What is phototropism? Let's learn all this and more!
Script by Sheryl Hosler
Watch the whole Botany playlist: http://bit.ly/ProfDaveBotany
General Chemistry Tutorials: http://bit.ly/ProfDaveGenChem
Organic Chemistry Tutorials: http://bit.ly/ProfDaveOrgChem
Biochemistry Tutorials: http://bit.ly/ProfDaveBiochem
Biology/Genetics Tutorials: http://bit.ly/ProfDaveBio
EMAIL► [email protected]
PATREON► http://patreon.com/ProfessorDaveExplains
Check out "Is This Wi-Fi Organic?", my book on disarming pseudoscience!
Amazon: https://amzn.to/2HtNpVH
Bookshop: https://bit.ly/39cKADM
Barnes and Noble: https://bit.ly/3pUjmrn
Book Depository: http://bit.ly/3aOVDlT
We've gone over the various tiers of structure of a plant, from cells, to tissues, to organs and organ systems. Now it's time to better understand how plants grow. How to plants know when to grow? How do they know which direction to grow? All of this is regulated by plant hormones, which are signaling molecules, just like the ones that we have in our bodies, though they are totally different molecules than ours. Auxin, cytokinin, gibberellins, abscisic acid, and ethylene, what do these molecules do? What is gravitropism? What is phototropism? Let's learn all this and more!
Script by Sheryl Hosler
Watch the whole Botany playlist: http://bit.ly/ProfDaveBotany
General Chemistry Tutorials: http://bit.ly/ProfDaveGenChem
Organic Chemistry Tutorials: http://bit.ly/ProfDaveOrgChem
Biochemistry Tutorials: http://bit.ly/ProfDaveBiochem
Biology/Genetics Tutorials: http://bit.ly/ProfDaveBio
EMAIL► [email protected]
PATREON► http://patreon.com/ProfessorDaveExplains
Check out "Is This Wi-Fi Organic?", my book on disarming pseudoscience!
Amazon: https://amzn.to/2HtNpVH
Bookshop: https://bit.ly/39cKADM
Barnes and Noble: https://bit.ly/3pUjmrn
Book Depository: http://bit.ly/3aOVDlT
Let's learn the 5 major plant hormones and how we can remember their functions.
More free lessons & practice -https://www.khanacademy.org/science/class-10-biol...
Let's learn the 5 major plant hormones and how we can remember their functions.
More free lessons & practice -https://www.khanacademy.org/science/class-10-biology/in-in-control-and-coordination
Khan Academy is a nonprofit organisation with the mission of providing free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Created by Mahesh Shenoy
Let's learn the 5 major plant hormones and how we can remember their functions.
More free lessons & practice -https://www.khanacademy.org/science/class-10-biology/in-in-control-and-coordination
Khan Academy is a nonprofit organisation with the mission of providing free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Created by Mahesh Shenoy
This is a quick short animated video on the Discovery of Auxins and its effect on plants. The classical experiments that led to the discovery of auxin have been...
This is a quick short animated video on the Discovery of Auxins and its effect on plants. The classical experiments that led to the discovery of auxin have been discussed in detail.
This is a quick short animated video on the Discovery of Auxins and its effect on plants. The classical experiments that led to the discovery of auxin have been discussed in detail.
This video covers:
- How we can use plant hormones to control growth in plants
- How we can use Auxins to stimulate plants to grow, or kill weeds
- Uses of Gi...
This video covers:
- How we can use plant hormones to control growth in plants
- How we can use Auxins to stimulate plants to grow, or kill weeds
- Uses of Gibberellin to control dormancy, induce flowering and grow larger fruit
- How we can use ethene to control the ripening of fruit
Exam board specific info:
AQA - Separate/triple and higher tier only
IGCSE Edexcel - Not in your course
Edexcel - Separate/triple and higher tier only
OCR 21st Century - Separate/triple and higher tier only
OCR Gateway - Separate/triple and higher tier only
Maths Playlist:
https://www.youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh
GCSE Chemistry playlist:
https://www.youtube.com/watch?v=fN8kH9Vvqo0&list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W
GCSE Biology Playlist:
https://www.youtube.com/watch?v=--dIBinUdeU&list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g
GCSE Physics Playlist:
https://www.youtube.com/watch?v=aHVJfRxeAxo&list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7
This video covers:
- How we can use plant hormones to control growth in plants
- How we can use Auxins to stimulate plants to grow, or kill weeds
- Uses of Gibberellin to control dormancy, induce flowering and grow larger fruit
- How we can use ethene to control the ripening of fruit
Exam board specific info:
AQA - Separate/triple and higher tier only
IGCSE Edexcel - Not in your course
Edexcel - Separate/triple and higher tier only
OCR 21st Century - Separate/triple and higher tier only
OCR Gateway - Separate/triple and higher tier only
Maths Playlist:
https://www.youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh
GCSE Chemistry playlist:
https://www.youtube.com/watch?v=fN8kH9Vvqo0&list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W
GCSE Biology Playlist:
https://www.youtube.com/watch?v=--dIBinUdeU&list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g
GCSE Physics Playlist:
https://www.youtube.com/watch?v=aHVJfRxeAxo&list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7
Tahniah Izyan dan pasangan Syahiran! semoga hubungan dan cinta kalian kekal ke syurga ameeen
Teaser Wedding of Izyan & Syahiran : https://youtu.be/s_xHVh26R2...
Tahniah Izyan dan pasangan Syahiran! semoga hubungan dan cinta kalian kekal ke syurga ameeen
Teaser Wedding of Izyan & Syahiran : https://youtu.be/s_xHVh26R28
Full Wedding of Izyan & Syahiran : https://youtu.be/mDTchF9OYN0
Lokasi : Kota Bharu
thank you guna servis kami 🥰
---------------------------------------------
untuk sebarang tempahan servis boleh tekan di sini https://linktr.ee/auxinfilm thank you!
Tahniah Izyan dan pasangan Syahiran! semoga hubungan dan cinta kalian kekal ke syurga ameeen
Teaser Wedding of Izyan & Syahiran : https://youtu.be/s_xHVh26R28
Full Wedding of Izyan & Syahiran : https://youtu.be/mDTchF9OYN0
Lokasi : Kota Bharu
thank you guna servis kami 🥰
---------------------------------------------
untuk sebarang tempahan servis boleh tekan di sini https://linktr.ee/auxinfilm thank you!
This video explains, how Auxin functions as growth regulators with the simple experiment?
Auxin was the first plant growth hormone invented by the scientist. It...
This video explains, how Auxin functions as growth regulators with the simple experiment?
Auxin was the first plant growth hormone invented by the scientist. It is the primary growth hormone of plants.
This hormone plays a vital role in primary plant development. It controls the vertical and lateral growth in roots and in shoots. They are also responsible for all the process that takes place in plants before the cell differentiation.
This video explains, how Auxin functions as growth regulators with the simple experiment?
Auxin was the first plant growth hormone invented by the scientist. It is the primary growth hormone of plants.
This hormone plays a vital role in primary plant development. It controls the vertical and lateral growth in roots and in shoots. They are also responsible for all the process that takes place in plants before the cell differentiation.
This video covers:
- The idea that plants respond to their surroundings just like animals do
- But that plants use local hormones rather than a nervous system
- How auxins enable plants to respond to light (phototropism) and gravity (geotropism or gravitropism)
Exam board specific info:
AQA - Separate/triple science only
IGCSE Edexcel - Everything is relevant to your course!
Edexcel - Separate/triple science only
OCR 21st Century - Separate/triple science only
OCR Gateway - Separate/triple science only
Maths Playlist:
https://www.youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh
GCSE Chemistry playlist:
https://www.youtube.com/watch?v=fN8kH9Vvqo0&list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W
GCSE Biology Playlist:
https://www.youtube.com/watch?v=--dIBinUdeU&list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g
GCSE Physics Playlist:
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Plant Growth: Auxins and Gibberellins | Plants | Biology | FuseSchool
If a plant has enough water, minerals and energy, it will grow, right? Well, sort of… but there is more to it - like why do plants bend towards the light and not just grow straight? And why does the stem grow up but the roots grow down? It isn’t as if a plant has eyes to tell it where the sun is.
Plants are packed full of hormones, sending messages around to its different parts. Where humans have the creatively named ‘growth hormone’, plants have hormones called auxins.
Auxin is produced in the stem tips and roots, and controls the direction of growth in response to different stimuli including light and gravity. Having been made in the tips of the stems and roots, auxin is moved in solution by diffusion to older parts of the plant. In the stem, the auxin causes the cells to change in elasticity. More elastic cells absorb more water, and can grow longer.
Strangely, though, stems and roots respond differently to high concentrations of auxins. Whilst the stem cells grow more, the root cells actually grow less. So auxins make plants grow, but why do they bend towards the light? How do they know to do this when they don’t have eyes?
The bending happens because the light hits the one side more and breaks down the auxins in that side of the stem. So then growth slows down on the ‘light’ side. The faster growth on the ‘dark’ side causes the shoots and leaves to turn towards the light - which is ideal for the plant for photosynthesis.
Auxin is produced in the tips of growing shoots. If the tips are cut off, then no auxin can be produced and so no plant growth. If the tips are covered, whilst auxin is still produced, light cannot break it down and so phototropism cannot occur: the plant just grows straight up and does not bend towards the light.
Auxins have the opposite effect on root cells. In roots, auxins cause less growth. The shaded side of roots contain more auxins, and so they grow less. This enables the ‘light’ side of the roots to grow more and bend away from the light.
And if that wasn’t weird enough, we have opposites happening with auxins and gravity too. In a horizontal root, the bottom side contains more auxins and grows less, so the root bends downwards in the direction of gravity. So positive geotropism. But of course, the stem responds differently.
In a horizontal stem, again the bottom side contains more auxins because it is less directly hit by sunlight. But because auxins cause growth in stems, the bottom side grows more causing the stem to bend upwards, against the direction of gravity, so negative geotropism.
But I am giving auxins too much credit; they don’t work alone. They have a partner in crime; cytokinins. You don’t need to know anything about these hormones other than the fact that they work alongside auxins. There is another plant hormone that you do need to be aware of… Gibberellins.
Once a seed germinates, the roots and shoots start to grow. But for this, the seed needs energy. Luckily, the seed releases a hormone called gibberellin which causes the starch in the seed to turn into sugars and provide the seed with energy to grow. As well as causing shoot growth, gibberellins can also stimulate flowering and fruits in some plants. And they also work with auxins to cause stem elongation.
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We've gone over the various tiers of structure of a plant, from cells, to tissues, to organs and organ systems. Now it's time to better understand how plants grow. How to plants know when to grow? How do they know which direction to grow? All of this is regulated by plant hormones, which are signaling molecules, just like the ones that we have in our bodies, though they are totally different molecules than ours. Auxin, cytokinin, gibberellins, abscisic acid, and ethylene, what do these molecules do? What is gravitropism? What is phototropism? Let's learn all this and more!
Script by Sheryl Hosler
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Let's learn the 5 major plant hormones and how we can remember their functions.
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Created by Mahesh Shenoy
This is a quick short animated video on the Discovery of Auxins and its effect on plants. The classical experiments that led to the discovery of auxin have been discussed in detail.
This video covers:
- How we can use plant hormones to control growth in plants
- How we can use Auxins to stimulate plants to grow, or kill weeds
- Uses of Gibberellin to control dormancy, induce flowering and grow larger fruit
- How we can use ethene to control the ripening of fruit
Exam board specific info:
AQA - Separate/triple and higher tier only
IGCSE Edexcel - Not in your course
Edexcel - Separate/triple and higher tier only
OCR 21st Century - Separate/triple and higher tier only
OCR Gateway - Separate/triple and higher tier only
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https://www.youtube.com/watch?v=--dIBinUdeU&list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g
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This video explains, how Auxin functions as growth regulators with the simple experiment?
Auxin was the first plant growth hormone invented by the scientist. It is the primary growth hormone of plants.
This hormone plays a vital role in primary plant development. It controls the vertical and lateral growth in roots and in shoots. They are also responsible for all the process that takes place in plants before the cell differentiation.
Auxins (plural of auxin /ˈɔːksᵻn/) are a class of plant hormones (or plant growth substances) with some morphogen-like characteristics. Auxins have a cardinal role in coordination of many growth and behavioral processes in the plant's life cycle and are essential for plant body development. Auxins and their role in plant growth were first described by the Dutch scientist Frits Warmolt Went.Kenneth V. Thimann isolated this phytohormone and determined its chemical structure as indole-3-acetic acid (IAA). Went and Thimann co-authored a book on plant hormones, Phytohormones, in 1937.
Overview
Auxins were the first of the major plant hormones to be discovered. They derive their name from the Greek word αυξειν (auxein - "to grow/increase").
Auxin (namely IAA) is present in all parts of a plant, although in very different concentrations. The concentration in each position is crucial developmental information, so it is subject to tight regulation through both metabolism and transport. The result is the auxin creates "patterns" of auxin concentration maxima and minima in the plant body, which in turn guide further development of respective cells, and ultimately of the plant as a whole.
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). You are invited to attend the next lunch time Auxin session offered by the Centre for Teaching and Learning. Speaker.Dr Anthea Hansen. Topic.Socially responsive curricula in medical education. A student perspective ... . Summary of the Auxin. ... (noodl.
Auxin, a plant ... Additionally, the study identified the transcription factor LlbHLH35, which directly activates LlSusy1 in response to auxin signaling, thus linking auxin content to sucrose metabolism.
). You are invited to attend the fourth TLA (Teaching-Learning-Assessment) Auxin seminar of 2024, offered by the Centre for Teaching and Learning.. Topic.Challenges of Transforming Curricula ... Speakers.Dr. Ruenda Loots, Dr ... Date ... Time ... Summary of Auxin ... Dr ... .
A series of new techniques and methods have been developed for the trace detection of auxin, including chromatography, mass spectrometry, fluorescence luminescence, biosensors and electrochemistry.
Additionally, exogenous auxin treatment enhances leaf vein formation in rice. Intriguingly, by simultaneously increasing SHR and auxin levels in rice leaves, the researchers have successfully created C4-like vein patterning in rice.