GCSE Biology - Structure of a Leaf and Stomata #50

[@Cognitoedu]

If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it's totally free, and has been built to make learning and revision as easy as possible. The main features are: - Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown. - Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on. - Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like. - A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts. - A comprehensive bank of past exam papers, organised both by year, and also by topic. Amadeus & Tom

[@Kxy372]

I think u deleted the video on the website, I can’t find it anywhere

[@idk-g9o]

I’ve got a biology test about this tomorrow and I didn’t understand it when we learnt it in class. This video helped SO much, THANK YOU!

[@corvidcryptid8989]

THANK YOU to my teacher for sending me here. I don't like Biology normally, but I love these videos!

[@clouud4450]

yeah these types of videos are blessed

[@pollychan2016]

thought ur name was covid then haha

[@MF-el9lc]

oh so sweet

[@tonyname1277]

No one asked

[@armanmoiz2406]

Love ❤

[@urfavlolobaji]

For anyone who needs to learn the definitions for this lesson here ya go Wilts:the plants leave and stem droop due to lack of water Turgid:rigid cells that are full of water. The vacuole pushes against the cell walls Transpiration: the flow of water through a plant Xylem:a hallow tube that carries water and minerals to its leave Stoma(plural of stomata):allows gases to exit or enter Stomata: water evaporates and escapes Flaccid:flaccid cells are floppy so they can’t hold up a plant Guard cells: each of pair of curved cells that surrounds stoma Dont worry guys I needed to write it somewhere since I memorized them soo I thought it will be useful for you Guys too 💖💖

[@LivzonlineP0G]

Lol I’m in class watching this lol

[@jamalabdishakur8384]

GCSE which grade of this topic belong to??

[@LivzonlineP0G]

@@jamalabdishakur8384 I did it in year 9

[@rubyreadal6607]

@@jamalabdishakur8384 it says GCSE biology on the vid

[@dillontan5644]

what a kind soul you deserve an A grade in science

[@Matt-xh7wq]

Post-Video Quiz: 1. What do the xylem do? 2. What do the phloem do? 3. What is a waxy cuticle and what does it do? 4. How do stomata know when to open and close? 5. What are meristem cells?

[@followersofahlul-bayt9484]

1.transports water and minerals through plants 2. transports food 3. a waxy waterproof layer that surrounds the outer part of the eperdermis to prevent waterloss. 4. they are controlled by guard cells 5. tissues for growth

[@Matt-xh7wq]

Good work, keep up the revision.

[@yourlocalhijabi4443]

1. transports water into the leaf 2. transports glucose out of leaf (into plant) 3. the waxy cuticle is thin layer on the upper epidermis of the leaf that is made up of lipids and fats. it reduces the loss of water molecules. 4. when the water concentration is high in the leaf, the guard cells becomes turgid, and it opens. when water concentration is lower in the leaf, the guard cells become flaccid, and it closes. 5. stem cells that allow the plant to grow. they are located in at the tips of the stems and roots and shoots of the plant

[@Ricedigga14]

1. Water from the soil into the leaf 2. Glucose from the leaf leaf the rest of the body 3. A small layer that surrounds the upper epidermis that is water proof and prevents water loss 4. When there is more water in the leaf, the stoma will open, when there is less, it will close to conserve the water. It is also closed at night when photosynthesis doesn't occur and CO2 isn't needed. 5. Cells located on the tip of roots and stems that allow the plant to grow Good luck on exams guys

[@pasqualethene]

@@yourlocalhijabi4443 Good work, keep up the revision

[@28noah05]

Funny how half the comments of people complaining about school. Really though, these are good, I learn stuff from them.

[@joaquimasp]

We are complaining about online classes.

[@shom924]

@@joaquimasp like you study in class anyways

[@MuhammadAfzal-vu3kh]

Hi

[@cupidyua]

@@shom924OHHH

[@twishagirisankar596]

Your simple straightforward explanation really helps. Thank you :)

[@S-sh7ib]

This for your explanation, you’re the best teacher I’ve ever seen. Thanks

[@ParissHaze]

No because as someone with a science teacher with a freaking HEAVY SWEDISH ACCENT, this is so much easier to understand, THANK YOU🙏🙏

[@chansclown5147]

I appreciate this channel so much, it has saved lives I hope you read this

[@chansclown5147]

Omg you did see this :)))))

[@cityzeneditzz3536]

For anyone that needs to learn this for a test or somein here very usefull the leaf is a plant organ tissues in leaf; | upper epidermis -- protectes the surface of the leaf Transparant allows light to pass through for potysnthesis Waxy cuticle covers this, it's an oily material reduces evaporation/ prevents the leaf from drying out | lower epidermis -- contains stomata stomata allows carbon dioxiede to enter the leaf and oxygen to leave controls the amount water vapour that can pass out the leaf on the sides of the stomata you can find gaurd cells | palisde mesophyll -- contains palise cells these are packed with chloroplast chloropast contains clorophtyll which absorbs light need for photosynthesis | Spongy mesophyll -- these have alot of airspace that allows co2 that diffuse from the stomatathrough the spongy mesopyll to get to the paslise cells Oxygen dose the opposite and comes from the palisde cells to the spngy meospyll then to the stomata ------------------------------------------------------------------------------------------------------------------------------------------------------- | Xylem -- transports water from roots to the stem and leaves. some water is then used for photosynthesis also transprts disolved mineral ions likes magnesum used to make chlorophyll | Phloem -- trasnports disolved sugars from leaves to the rest of plant the sugars are produced my photoysnynthsis sugars can be used for lika glucose used for respiration Definations Wilts:the plants leave and stem droop due to lack of water Turgid:rigid cells that are full of water. The vacuole pushes against the cell walls Transpiration: the flow of water through a plant Xylem:a hallow tube that carries water and minerals to its leave Stoma(plural of stomata):allows gases to exit or enter Stomata: water evaporates and escapes Flaccid:flaccid cells are floppy so they can’t hold up a plant

[@3ly415]

Oh wow thanks!

[@Aisha-gd6dq]

THANKS SMARTIE

[@bradleyyoung528]

Truly, not all heroes wear capes

[@alexbuiilds]

tysm! I have a test coming up :)

[@Aieshh]

Ty😮

[@marvolord]

thanking my teacher for sending me here bc they sound like tom riddle 😌 will gladly listen to this

[@ereshkigal1435]

you just summarized in 10min what it took my teacher two weeks to teach.

[@karimikei8377]

I would ve died from stress if I didn't binge ur vids before my exam

[@Bell-fr9xg]

Leaf: Leaves are where photosynthesis takes place, and it requires Carbon dioxide & water. The water comes from soil through the roots and xylem. List of components in the leaf: Lower epidermis: first level in which carbon dioxide diffuses. Stomata & cell guard are here. Stomata: it allows carbon dioxide to enter the leaf and oxygen to leave. Cell guard: controls when the stomata opens and when it closes. If there's a lot of water in the plant cell guards will open more and allow more carbon dioxide to enter. They close at night time when photosynthesis isn't taking place. Spongy mesophyll: a level in which carbon dioxide goes through and contains a lot of air gaps between cells so that the gas can diffuse easily into the next level. Palisade mesophyll: where photosynthesis occurs, since the palisade cells are full of chloroplasts. Upper epidermis: the last level, very transparent so that light can pass through to get to the chloroplasts in the palisade cells. Phloem: carries the sugar molecules to the rest of the plant after photosynthesis. Xylem: brings water up from the roots for the palisade cells to do photosynthesis.

[@tariqplays3180]

Thanks

[@ksumar]

Absolutely fantastic 👍 Quick simple and concise explanation. I admire your intro diagram of Cells ▶️ Tissue ▶️ Organs

[@yourdailydoseofsalt9021]

Hey guys. I had done my Biology A Levels 6-7 years ago. and through lack of practice, I've forgotten so much of the basic information. I know it feels like a drag right now, but make sure to knuckle down and consolidate this info, and hopefully you won't forget like I did. But, you're never too old to learn! Best of luck to any of y'all going through your GCSEs!

[@khushimodhwadia9342]

hey how was a level bio? im thinking of doing it

[@yourdailydoseofsalt9021]

@@khushimodhwadia9342 to be honest it was really good. Very informative, The course told me everything I needed to know, at a base level. I would recommend it. However, when I did my a level in biology, I also took three other a levels simultaneously, Which I think is still the norm, it did over encumber me with coursework, so exercise caution and make sure that you're ready 💚

[@LivzonlineP0G]

I swear we learnt about this in like year 7 but here we are again ig

[@thinginground5179]

cause education is shite lol. School just crams you full of knowledge so fast -- most of which you arent even interested in -- and you cant even retain any of it. Utterly useless. Why should i be forced to take fucking "Drama classes" or "music classes" if they're of no use to me? They're not funda-DUCKING-mental..

[@a2editz605]

@@thinginground5179 absolutely right mate, these classes will be nothing but rubbish in the coming years so there’s literally no use of doing them now

[@thinginground5179]

@@a2editz605 Yeah, unless they are what you are striving for in particular.

[@maliyahnnathansadventures3649]

Was sent here by my school 😩

[@thegodfather1373]

Maliyah N Nathan’s Adventures same here

[@LivzonlineP0G]

Same

[@ShreyBrawlStars]

At least the vids are good and well made

[@tonyname1277]

No one asked

[@tonyname1277]

@@esasabir9040 I'm pretty sure your mother scolded ur a** for saying free palestine in every comment 🤣

[@vikisonline17]

Epidermis- easy Palisade mesophyll- perverted men Spongy mesophyll- send many Epidermis- easy Guard cells- girls Stomata- selfies …that’s how i remember it

[@itsmeaminah]

THATS ACTUALLY HELPFUL😂

[@moose7061]

hey yo my school sent me here ;(

[@shom924]

Do you not like biology?

[@moose7061]

@@shom924 noo!

[@urfavlolobaji]

I don’t like biology 😂 is still have to take it

[@BarryWantsAChippyNow]

Same

[@harithmustafa7649]

thinks you are the beast teacher in the interiate , and I am undear stand .

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Remind me to come back in a 2 weeeks

[@jayd0n537]

Your videos are a life saver 🔥

[@shivengoel7012]

You explain very well!👍👍👍👍

[@omniscientgoat]

Last bio exam tomorrow, I'm going to miss you bud.

[@Vroomity925]

which animation software do you use?

[@101325]

Thanks again for another great resource for my students to use.

[@grim-r3c]

so if the plant was at night that means that the stomata will be closed because there ain t no sunlight to absorb and be able to photosynthesise am i right

[@aibah_]

yes

[@rizriz6477]

People here from biology/science have to like this comment

[@soreal-uj5de]

Off topic but do u draw all the diagarams ?

[@Cognitoedu]

Yaaas, some of them are a right pain to be fair 🙃

[@evateng4211]

Never knew there was so much more to leaves :O

[@camillecamille7585]

I didnt listen in class when they played this video (im year 8 btw) so i wrote on my hand to watch the videos when i get home, and im so proud of myself for actually doing that!

[@ISTHISALREADYTAKEN]

im not. lol. whaat ever i just said effects you 0

[@WEEBWHOSELLSWEED]

yaaay Congrats on 200k!!!

[@Cognitoedu]

Thanks 🥳🥳

[@jophyartlaw5964]

what does the spongy mesophyll tissue do?

[@checkmateiwin1372]

So helpful for studying!

[@jaba6772]

could you explain how potassium ions cause stomata to open (if they do) ? And also, if there are other factors that could affect guard cells swelling or becoming turgid? Great video.

[@Cognitoedu]

Hi Idk, thanks for the comment! This is a little beyond the scope of the course, so feel free to google it but it's not something we can explore in proper depth here in the comments section :)

[@jaba6772]

oh okay. i once got a question in my mocks about that, but i believe it was just asking me about osmosis? And how having a higher concentration of ions in a cell would mean that guard cells would become turgid because of the lack of water, so stomata would close. This is what i think 😂

[@Cognitoedu]

That would make sense, as a general principle water will flow to areas with higher concentrations of ions by osmosis. The exams often test general principles in weird settings, but they'll give you any extra information you need in the question :)

[@yeetcallmecarson5323]

@@jaba6772 well abscisic acid controls the stomata as well. but the potassium thing is just that it tranfers into the cell with the water, and is seen as a factor

[@ericyoutube77]

I can’t thank you enough, I wish I could give you 1000 subs

[@mamellombongo1705]

Where is the link in the description?

[@aaravpatel5980]

Me watching it for THE SECOND TIME IN 3 HOURS

[@Goingbackto5O5]

Nah cuz same. Im REALLY slow

[@jennyhart7588]

Thank you! I have never seemed to understand this before but now I do

[@gfdv423]

U said that guard cells are sensitive to light ,so why they didn't close at day time and instead they close at night time even though sun light come out at day time,Why?Can u explain it pls?

[@CRICKET_88z]

bcz they contain CO² which can run away 😊

[@RJ8-Z]

Why does school make us do this

[@surji0009t]

me watching this in 2024 and i have just came in year 9 lets gooo

[@marcelasanchez2643]

bro were are yo from? thanks

[@BigBob-bd1wf]

Cool video

[@amyy.s618]

teacher sent me here 🙃

[@DylanOwens-gm3ct]

Great video congrats on 1k subs

[@Cognitoedu]

Thanks Dylan! Glad you found the vid useful too :)

[@benhalson8311]

guard cells with low water in the cell- im literally him

[@Movementofsubstancesacro-mh2dt]

could you make more video's on gcse biology chemistry and physics please? i love your vids btw..the best..

[@mostafamansour2495]

One word : 🙌 LEGEND 🙌

[@fazbaree56]

That is 3 but it is tru

[@ehsaanashraf7790]

Great video

[@GeNaviation]

Helped in preparing for my Exam tomorrow, i thought i would fail, but instead i topped 😅.

[@Jv2332]

Who else is here from endon high school 😅

[@tonyname1277]

Not me!

[@zdrafts_]

Really Helpful

[@tjtornado3164]

Teacher sent me me fell asleep

[@SMB1568H]

Imma got punished and had to lie to learn

[@Myst-d8n]

Oh u saved me

[@SMB1568H]

I’m watching.

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probably one of the lesser good videos cognito has made. video is just throwing stuff at me without explaining what they are

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[@MaxCassidy802]

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[@NoLimitAyan]

School 😵 KZbin 🤗

[@a8-bit_gamer07]

dont make these vids so i dont hav to watch them for school.

[@jaybayl1109]

Same here

[@sinead9426]

@@jaybayl1109 same lol

[@kittythecat6090]

At least they help with revision

[@3ly415]

Nahhh I want to watch these, would rather watch these than listen to my tr explaining for 45 mins or smthn

[@Pksasski]

This is really interesting, don’t say that because it is rude. Who knows, you might need them in order to study for your GCSEs, you will look like a hypocrite then

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cool beanz :)

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School*

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[@numnumfriends3972]

You’re talk fast😑 hard to understand what ur saying. But thanks for the video

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There’s an option to slow down the video

[@numnumfriends3972]

@@st1nkyr4t oh ok tysm

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ur probably good looking.

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