Testing a leaf for starch for IGCSE Biology

[@whelvetooth1435]

Who else was forced to watch this for school.....

[@williamgrant9334]

me

[@TomDare]

Man, life is tough. Feel for you guys...

[@instinctshadow4950]

Me

[@ellaconnelly5886]

AHAHAHHAHAHAH ME

[@leafytiger2447]

me

[@allsosavvy]

0:47 was probably the cleanest match strike I've ever seen

[@TomDare]

It's a source of considerable pride.

[@sillykatttt]

I agree

[@malachi__]

same here. not bad video but i would have never seen it otherwise.

[@nadaalzubaidy7477]

@@malachi__ i think youre replying to the wrong comment bro but same

[@hjka-ux5nr]

10/10

[@juliekovatcheva522]

Thank you SOO much , I can see the passion you have when educating students. We need more teachers like you!:)

[@TomDare]

Thanks!

[@jaanarodrigo4880]

yess! he seems like he really want kids to enjoy bio

[@johanyeah3189]

where do i get a Variagated leaf?

[@gayboi9776]

A weed farm

[@roxers8700]

who else is here from their bio lesson

[@glitchgamer610]

yes

[@amelia3jay]

me:)

[@MYSTmke]

Yup

[@katiepatton2195]

Me

[@pakalaka_j]

Yh

[@hala-ov4de]

YOOOO POG THIS MADE ME GET A FULL MARK

[@johanyeah3189]

where do i get a Variagated leaf?

[@hala-ov4de]

johan yeah what wtf is that

[@waterbottlecompany]

@@johanyeah3189 a variegated leaf is basically a leaf that is green and white. you can get it a plant store ig idk.

[@dimebagdarrell2390]

3:20 he has the same expressions as a Mii on wii sports when you throw the bowling ball backwards

[@TomDare]

Proper old school reference. Respect.

[@slofy_]

Anyone else Watching this as home learning

[@katiepatton2195]

Me

[@savagegaming427]

yep

[@pengovilapucho5707]

Me my teacher said so

[@densetsu5078]

Me

[@yogurllay7462]

Yep

[@sheabo0012]

THIS WAS VERY POGCHAMP TOM THANK YOU SIR I AM NOW A GENIUS

[@johanyeah3189]

where do i get a Variagated leaf?

[@nanakirima]

@@johanyeah3189 any leaf that has variations in its color

[@lovinsum]

WOOOOOO POGGERS WERE ALL SMART NOW!

[@sumayakhumalo6678]

@@johanyeah3189 me too

[@fatimanauman868]

For anyone unable to see the last slide properly - Draw the leaf showing areas with and without chlorophyll - put in boiling water for 30 seconds - Turn off Bunsen - Boil in ethanol using a water bath - put back in water for 30s - spread out on white tile and lightly drizzle with iodine solution - draw the leaf indicating areas with and without starch (picture and picture helps to see it too, if this is pretty obvious then pretend this comment is non-existent ig :D)

[@yousefazab8141]

thanks man ALOT

[@lizxyplays5331]

i read this topic 4 times and i would keep forgetting the information but then i had the thought to look up the experiment to see with my own eyes and im glad i thought of that and found ur wonderful video thank u.

[@prongyao]

Thank you so much for sharing the starch test. In our country, schools do not have any laboratory, and we are studying science subjects like walking in the dark. Your video helps me a lot with my study Mr., Thanks again.

[@TomDare]

So glad to help. Which country are you watching from?

[@prongyao]

@@TomDare From Myanmar, Sir

[@reis_6167]

Tysm, this changed my life completely

[@tobyfogg5861]

we students dont get paid for our job lol

[@robynshepherdd7865]

ikr, we need to get paid..

[@MNR_CFC]

bruh we need to pay for something we dont want

[@kaykay2768]

n it sucks😂

[@KindFiction]

Anyone else's teacher tell them to watch this during online school/biology??

[@0308.]

Love from Pakistan dude,I am Cambridge IGCSE student from Pakistan and ur videos helped me for my ATP prepration.

[@TomDare]

And back at you from the UK! Hope all the study pays off!

[@user-sd9is9si6o]

How sad doing science at a level

[@amal.i38]

Amazing, the colours came out so well! Thank you so much, will definitely be showing this video to my class😊

[@manamendradasantha1177]

Actually this test was more understandable ,and thanks sir

[@nickcrampton4914]

POV: you were forced to watch this for your biology lesson but you ended up just reading the comments...

[@tommyyiannakou9250]

ratio

[@tommyyiannakou9250]

w

[@tommyyiannakou9250]

w

[@prometheus_78]

0:47 that match strike tho

[@iloveeveryone47]

tysmmmmmmm ur explaination was much better than those words in my text book 😁😊

[@TomDare]

Glad it has been helpful!

[@sumayakhumalo6678]

Thank you Sir this was helpful, so what are the safety precautions when doing this because I want to try it out?

[@ildepheponsengendahimana1978]

thank you that help a lot 😍😍😍😍😍

[@LivingstonKalule-je6no]

Thank u sir I have learnt this by the tym our tr taught this I was absent so I was just cramming from friends thanks alot

[@AW-ty8ol]

This helped me a lot in my online studies, thanks

[@TomDare]

Glad to be helping!

[@johanyeah3189]

where do i get a Variagated leaf?

[@GG4EVA623]

1:10 the trump gesture tho 😂🤣

[@TomDare]

I hadn't seen that before. It totally is. Wow.

[@molten7391]

lmao

[@_rainbow_vibes_4310]

I agree 🤣🤣😂😂

[@johanyeah3189]

where do i get a Variagated leaf?

[@sunnahwear7540]

Awesome video dude, keep up the great work 😉😀

[@henrique7pg926]

who has to watch this video in lockdown

[@TomDare]

Is the answer 'Henrique Pereira Guerrero'?

[@shwushintay352]

Me

[@livvyallan2474]

Meeeeeee

[@ridhamkabra889]

I am in summer vacation this is still fun to watch

[@TomDare]

Kudos to you!

[@shadowjuniors839]

Ppl who like this comment are here bc of school....

[@oliverfletcher6707]

Most thought through tea ever

[@OG_Shady]

I don't know if you Will reply,But Thank You my teacher sent me here this was good:) Actually my teacher didn't send me it's for my exam:)

[@diyeah1036]

Amazing video I could understand every thing

[@TomDare]

Really glad it helped!

[@mrbolsita1470]

here I am, watching this video after two years it has been published haha. Greetings from argentina :)

[@saeedamohamed4245]

Thank you sir this helped me for my project in bio

[@Camelman-zn4oi]

This was very helpful thank you

[@sirbuzzer7320]

thanks so much this helped me with my test : )

[@eieiphyo499]

As I'm Grade11 student, I have to learn about it in my biology textbook and it's really useful and helpful for me. Thank u so much, teacher!❣️

[@TomDare]

So glad it helped!

[@hostthegamevibeile8978]

Like the pop rock candy sound and its the reason it pops in nature

[@evieharrisonboo]

im here for the into/outro LALALAL LA LAAAAAA

[@JanellMeyer]

I have tried this experiment multiple times with variegated pothos leaves --many different varieties-- but have yet to be successful. I was hoping to write up a lab for my advanced students to do, but if I can't do it I can't hope that they will be successful.

[@incognito9537]

Love you Mr Dare😍❤💘

[@niamh4201]

GO KING

[@jamal6935]

Thank you for educating me #wap #emo is fun

[@StonerBoy-mel0dy]

This helped a lot thanks bro

[@TomDare]

Pleasure - glad it helped

[@ki6ran]

watching this in lockdown, because we cant do the practical

[@SiyabongaMkhwanazi1]

Why do we test for starch in the leaf not for sugar?

[@Itxmaaz806]

Very gooood🎉

[@rynisme9350]

This man is a genius. who thought anyone would use a science equipment to hold a camera XD.

[@o_hall7h981]

who's watching in 2021

[@shwushintay352]

Me

[@rizikikondokelwa-um5up]

Why is it necessary to get rid of chlorophyll

[@bluediamond3688]

Really good video

[@TomDare]

Thanks Blitzy

[@ahmadafaneh1954]

actually,the noiling water is used for the braking of cell membranes

[@lpsangel3]

Great video!

[@TomDare]

Glad you enjoyed it

[@sheabo0012]

YOU ARE GOOD AT FARMING LULW AND TWITCH PRIMES

[@johanyeah3189]

where do i get a Variagated leaf?

[@xeniaaa]

thankyouuuuuuuuuu dr.tom!!!!

[@rizriz6477]

My science teacher made me watch this ⊙︿⊙

[@bihansathathsari7254]

anyone watching this at 2021in school or home .........

[@ComedyPetHD]

Can you please respond I have a question.Why is the leaf boiled in the water?

[@Akuetteh-AkotoBRIANDT]

Can you do an experiment on how flowers absorb water

[@jamso6926]

Wow very inspirational

[@kbroad749]

Why was alcohol used to treat the leaf?

[@TomDare]

This removes the chlorophyll, turning the leaf white so that the a colour change is easier to see during the iodine test.

[@kyliechaneditzzz]

I don't get it if ethanol removes chlorophyll why does the leaf turn blue black

[@Dyiing]

Iodine forms a blue/black complex with starch, which is left in the leaf, not chlorophyll

[@jeromekenfack6601]

It is very good like an 😂😂😮😮😮😊experiment

[@palmerfn1094]

this helped with my school work.

[@TomDare]

Glad it helped!

[@hostthegamevibeile8978]

Whats that white ip that forms on plants by nature from starch

[@JP-ml3cs]

hmmm @Aryan Suryawanshi

[@MandisaLira-b3t]

Can you please give all three variable and identify each one

[@francissaute3808]

Very helpful

[@TomDare]

Glad you think so!

[@francissaute3808]

Great vid

[@kyliechaneditzzz]

If we remove chlorophyll why is there still starch present?

[@elizabethgreenhalgh3031]

i love the outro music

[@johanyeah3189]

where do i get a Variagated leaf?

[@lintheteacher]

What I really liked is the bgm in the beginning and the end😂😂

[@sahasra_loveyourself_]

Nice video was helpful

[@TomDare]

Glad it helped

[@hostthegamevibeile8978]

It evaporates in wilderness a op to rain etc

[@jamso6926]

Not my proudest baby making time

[@johanyeah3189]

where do i get a Variagated leaf?

[@ayshahassimsakoor1008]

What colour would the leaf turn if starch was not present in the leaf🤔

[@GachaNet-vs2yl]

orange maybe

[@supersarah8796]

Orange

[@edwardnashtonsglasses]

idk y i need this for year 8 science revision

[@sibongilenancy3352]

What is the aim of this practical activity

[@SilasHarveyRobothamMawdsley]

Love the music

[@Limefilms]

i was hold on gunpoint to watch this video

[@vrtx1699]

A really cool teacher

[@TomDare]

I endorse this comment.

[@johanyeah3189]

where do i get a Variagated leaf?

[@tomclarke6901]

From a weed farm

[@tengwermiriam4293]

Hello prof, do you have starch extraction protocol , I'm working on physiochemical parameters of water chestnut

[@hibakouzi4544]

so u kill a leaf just to see if it has starch ???

[@williamisaac-barker5877]

Can sm1 tell me the observations from the experiment

[@DTren1]

Who else here to study for biology?

[@samwatson08]

Who else agrees the cleanest match strike ever

[@TomDare]

It's a key skill for all science teachers.

[@SarfrazSvar]

Well said; it is EVIDENCE and not PROOF that glucose is required to make starch and photosynthesis is needed. Science is empirical.

[@rizriz6477]

Anyone here in March?

[@R-OHAN]

10YAC triple?

[@curry1331]

im doing homework at 11pm while watching this

[@nedtyson2230]

Any one in my science class seeing this?

[@Phoenix-nh9kt]

who else loves the intro music?

[@johanyeah3189]

where do i get a Variagated leaf?

[@kavithasridhar3118]

Why have u asked for a leaf in every single comments

[@joraa]

is bedatine okay to be an alternative to use for iodine?

[@kenjaboo8057]

I'm not sure but it might

[@niamh4201]

WOOOOOOOO

[@niamh4201]

MY GUYYY

[@AngelineZhang-l1p]

Whose school ask for a conclusion

[@patiencemuzari7406]

IS THERE A TEST FOR VITAMINS ?

[@hi.360]

Patience Muzari yes

[@jessicaabbo3658]

What are the independent and dependent variables in this experiment? :)

[@TomDare]

The dependent variable is the presence or absence of starch. There isn’t an independent variable in this demo, but you could easily construct one by changing a factor, eg. covering a part of the leaf, removing CO2 etc.

[@jessicaabbo3658]

@@TomDare thank you so much!!

[@learnwithswayamwagh4523]

i watched from India

[@TomDare]

Great! Hope this video is helpful!