Plant Hormones: Tropisms | Plants | Biology | FuseSchool скачать в хорошем качестве

Plant Hormones: Tropisms | Plants | Biology | FuseSchool

Plant Hormones: Tropisms | Plants | Biology | FuseSchool Plants have developed responses called tropisms. A tropism is a growth in response to a stimulus; so light and water in the plant’s case. There are different types of tropisms: Positive tropisms are when growth is towards the stimulus - so the plant growing towards the light to maximise the stimulus for photosynthesis. Negative tropisms are when growth is away from the stimulus - so roots growing away from the light, and deeper into the soil, so there is less chance of them being dried out. These are both phototropisms: growth in response to light. There are also geotropisms which is growth in response to gravity. The stem undergoes negative geotropism, because it goes against gravity, and grows upwards towards the light. Whereas roots undergo positive geotropism, because they grow in the same direction as gravity - downwards. So unsurprisingly, plants grow in response to light and water, and grow towards or away from light (Phototropism) and with or against gravity (Geotropism). But something must control this growth. Just like humans, plants have growth hormones. We will look at these plant hormones in our video called ‘plant hormones: auxins and gibberellins’ and we will see how they are used in weed killers, fruit ripening and more. 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:    • CHEMISTRY   Find all of our Biology videos here:    • BIOLOGY   Find all of our Physics videos here:    • PHYSICS   Find all of our Maths videos here:    • MATHS   Instagram:   / fuseschool   Facebook:   / fuseschool   Twitter:   / fuseschool   Access a deeper Learning Experience in the FuseSchool platform and app: www.fuseschool.org Follow us:    / fuseschool   Befriend us:   / fuseschool   This is an Open Educational Resource. If you would like to use the video, please contact us: [email protected]