PLANT GROWTH FACTORS: IAA and tropisms for A-level Biology. Phototropism and gravitropism.

[@isobelcutts8229]

After watching these videos, I went from an E in October to an A in February, I couldn’t recommend more!

[@adailyfact]

What did you get in the actual exam?

[@uyangapuujee4508]

Hi! How’d your exam go?

[@fluffywanheda4949]

Bro i just need to pass at this point

[@jacoblavers9162]

same :(

[@abbiexo2557]

Your vids have made me go from a U to a D in just a couple months.. just need to go up one more to a C :)

[@MissEstruchBiology]

ahh that's great news Abbie! So pleased your hard work is paying off and you're seeing improvements! Keep it up 💪🏼 If you need revision and study tips i have playlists on this. Also lots of practice questions at missestruch.com

[@tatianamartins7278]

this has helped me so much! thank you 💕

[@MissEstruchBiology]

Glad it helped!

[@Espiritu_de_Obiwon]

Hi Miss Estruch, how do roots know where the light source is if there's no light in the soil?

[@daisylawrence7447]

with gravitropism in shoots, if cell elongates on lower side, then why doesn't this increase in weight cause the shoot to bend downwards?

[@Sena-en1df]

Hi Miss, can you explain how this distinguishes from GCSE apart from changing the name of auxin to IAA? Because i want to use this topic in my essay however i can't really see the difference from gcse

[@lareenahmad9232]

hi miss, i love your videos and they have been helping me so much thank you!! at 5:00 however i dont understand how "IAA inhibits cell elongation causing root cells to elongate more on the lighter side" if it inhibits growth in the root why is it still growing downwards?

[@juliettecurran3173]

I think it's because the IAA inhibits elongation of cells in the lower (more shaded) side of the root, meanwhile the cells on the upper (less shaded) side of the root keep elongating so they kind of grow over the lower side, causing it to bend downwards. Im not 100% sure though, if anyone else knows the answer pls correct me haha

[@lareenahmad9232]

@@juliettecurran3173 thank you :))!!

[@SniprsClanXx]

Sorry miss but the outro song gave me a stroke

[@MissEstruchBiology]

😆😆 oh no! Sorry about that

me too lmao

[@haydenboora9179]

will you be making vids on the reflex arc, receptors and the control of heart rate?

[@MissEstruchBiology]

hey, these are already made in the topic 6 playlist. All A-level theory videos are uploaded. Hope that helps

[@haydenboora9179]

@@MissEstruchBiology thank you!! must have missed them

[@ol3273]

Hi miss, do we need to know about the acid growth hypothesis?

[@MissEstruchBiology]

hey not for AQA

[@Caller8194]

hello euan banks