GCSE Biology - Structure of a Leaf and Stomata #50
ฝัง
- เผยแพร่เมื่อ 16 ก.ค. 2024
- In this video we cover how plants are organised, and then take a closer look at the leaf. We consider the different parts of a leaf and how it is adapted for its functions.
We re-uploaded this video as the original had some unedited footage left in it. Sorry!
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.
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- 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
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?
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
Good work, keep up the revision.
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
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
@@yourlocalhijabi4443 Good work, keep up the revision
THANK YOU to my teacher for sending me here. I don't like Biology normally, but I love these videos!
yeah these types of videos are blessed
thought ur name was covid then haha
oh so sweet
No one asked
Love ❤
Funny how half the comments of people complaining about school. Really though, these are good, I learn stuff from them.
We are complaining about online classes.
@@joaquimasp like you study in class anyways
Hi
@@shom924OHHH
Your simple straightforward explanation really helps. Thank you :)
thanking my teacher for sending me here bc they sound like tom riddle 😌 will gladly listen to this
No because as someone with a science teacher with a freaking HEAVY SWEDISH ACCENT, this is so much easier to understand, THANK YOU🙏🙏
I would ve died from stress if I didn't binge ur vids before my exam
you just summarized in 10min what it took my teacher two weeks to teach.
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 💖💖
Lol I’m in class watching this lol
GCSE which grade of this topic belong to??
@@jamalabdishakur8384 I did it in year 9
@@jamalabdishakur8384 it says GCSE biology on the vid
what a kind soul you deserve an A grade in science
Absolutely fantastic 👍
Quick simple and concise explanation.
I admire your intro diagram of
Cells ▶️ Tissue ▶️ Organs
I swear we learnt about this in like year 7 but here we are again ig
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..
@@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
@@a2editz605 Yeah, unless they are what you are striving for in particular.
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!
hey how was a level bio? im thinking of doing it
@@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 💚
Epidermis- easy
Palisade mesophyll- perverted men
Spongy mesophyll- send many
Epidermis- easy
Guard cells- girls
Stomata- selfies
…that’s how i remember it
THATS ACTUALLY HELPFUL😂
Was sent here by my school 😩
Maliyah N Nathan’s Adventures same here
Same
At least the vids are good and well made
No one asked
@@esasabir9040 I'm pretty sure your mother scolded ur a** for saying free palestine in every comment 🤣
You explain very well!👍👍👍👍
hey yo my school sent me here ;(
Do you not like biology?
@@shom924 noo!
I don’t like biology 😂 is still have to take it
Same
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.
Thanks
Your videos are a life saver 🔥
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
Oh wow thanks!
THANKS SMARTIE
Truly, not all heroes wear capes
tysm! I have a test coming up :)
Ty😮
Last bio exam tomorrow, I'm going to miss you bud.
Where is the link in the description?
thinks you are the beast teacher in the interiate , and I am undear stand .
Great video
I can’t thank you enough, I wish I could give you 1000 subs
I appreciate this channel so much, it has saved lives
I hope you read this
Omg you did see this :)))))
which animation software do you use?
Never knew there was so much more to leaves :O
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
yes
Really Helpful
yaaay
Congrats on 200k!!!
Thanks 🥳🥳
So helpful for studying!
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.
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 :)
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 😂
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 :)
@@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
Off topic but do u draw all the diagarams ?
Yaaas, some of them are a right pain to be fair 🙃
could you make more video's on gcse biology chemistry and physics please? i love your vids btw..the best..
bro were are yo from?
thanks
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!
im not. lol. whaat ever i just said effects you 0
Me watching it for THE SECOND TIME IN 3 HOURS
Nah cuz same. Im REALLY slow
Why does school make us do this
Thanks again for another great resource for my students to use.
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?
Thank you! I have never seemed to understand this before but now I do
One word : 🙌 LEGEND 🙌
That is 3 but it is tru
People here from biology/science have to like this comment
I’m watching.
guard cells with low water in the cell- im literally him
teacher sent me here 🙃
Helped in preparing for my Exam tomorrow, i thought i would fail, but instead i topped 😅.
Hello
cool beanz :)
i love u
HI
Teacher sent me me fell asleep
Imma got punished and had to lie to learn
probably one of the lesser good videos cognito has made. video is just throwing stuff at me without explaining what they are
hammad ilyas ashraf
Who else is here from endon high school 😅
Not me!
Great video congrats on 1k subs
Thanks Dylan! Glad you found the vid useful too :)
School 😵
TH-cam 🤗
No thanks
2 cool 4 skool XD XD XD
School*
You’re talk fast😑 hard to understand what ur saying. But thanks for the video
There’s an option to slow down the video
@@st1nkyr4t oh ok tysm
H⃣ o⃣ p⃣ e⃣ u⃣ h⃣ a⃣ v⃣ e⃣ a⃣ w⃣ o⃣ n⃣ d⃣ e⃣ r⃣ f⃣ u⃣ l⃣ d⃣ a⃣ y⃣
Hope you have no likes
@@shom924 lol
@@urfavlolobaji he did 5 likes ur wish did not come true
'meezofil' hahahfdsijndgjsk
St Edwards anyone?
Knee Gurr lol I love how no one replies 😂
Nope
No
ur probably good looking.
What the fuck is this comment
LMFAOO
dont make these vids so i dont hav to watch them for school.
Same here
@@jaybayl1109 same lol
At least they help with revision
Nahhh I want to watch these, would rather watch these than listen to my tr explaining for 45 mins or smthn
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
Hello
yeeshooter hello
Hello
@@franpontcoronas1570 hola fran