IGCSE BIOLOGY REVISION [Syllabus 14] - Tropic Responses

[@Cambridgein5minutes]

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[@deenasandani8879]

First time actually understanding the concept that keeps coming up in past papers. NO ONE has explained this like you

[@Cambridgein5minutes]

*ERROR CORRECTION* 7:32 - Second bullet point says "root" bends upwards against gravity. It is meant to be "shoot"

[@rodaynawael1597]

THANK YOU SOOO MUCH FOR COMING BACK TO MAKING VIDEOS AND EXPLAINING !!!

[@bbugra3]

Thank you sooooo much

[@yamama.mafrajii]

please continue the syllabus, your videos help me a lot in my quizzes and exams

[@Cambridgein5minutes]

I’m glad I could help !

[@minvs]

BEST. TEACHER. EVER.

[@MohamedIbrahim-bh6gg]

THANK YOU A MILLION! But please, do NOT rush through. Try to explain each point in the most boring detail possible. Please continue making vids, i will be supporting u every single time. I just would like to kindly ask you to explain reproduction as good as u can, cause i struggle too much with that toppic.

[@l.p.m6716]

I 💕 you guys thxs so much for the support

[@Disappointed-67]

very cool video, helped me a lot!

[@mohamedbshewa9491]

astonishing video!!!!

[@yazeedalahmadi233]

thanks this helped me a lot you are really good at explaining 👍

[@Cambridgein5minutes]

Thanks! I'm glad it helped :)

[@sally875]

thank you so muchhhhh please continue the next chapter

[@solinmaaroof]

very helpful, thank you!

[@rishisriram3471]

Thank you so much!!!can u plz make a video on biotechnology and Genetic engineering? as I have exams tomorrow

[@abdulrahmanhammad1753]

Hey! Not sure if you respond to comments on old videos but, could you please explain what is meant by “Explain phototropism and gravitropism of a shoot as examples of the chemical control of plant growth”? Just not quite sure what they mean by “chemical control”. Thanks in advance!

[@Cambridgein5minutes]

Chemical control would be talking about the impact of auxins on plant growth. Essentially all they are asking is for you to explain how phototropism and gravitropism/geotropism work in terms of auxins which have been covered in the video :)

[@spanner.d9208]

Thank you 😁

[@nimra479]

But why should we place it horizontally for observing geotropism ?

[@Cambridgein5minutes]

Auxins are made from the shoot tip/root. The whole concept of tropism is that these auxins distribute *unequally* due to light or gravity. In geotropism the auxins accumulate on lower side of a horizontal shoot or root due to gravity. If the shoot/root was not placed sideways then there would be no accumulation of auxin, and the tropic response wouldnt occur :)

[@nicksahimbuwa685]

What about roots growing down wards it is what? ?

[@daliadarkazanli5992]

Thank you soo much!

[@moonlight-bo8dr]

tysm !

[@ismailmahmoud5113]

Thanks u man

[@Munther-bz5dc]

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