Biology; Chemistry; Physics: Post your doubts here!

[exploded diper]

The stalk contains cuticle on one side which prevents the epidermal cells from expanding ...so when the cortex cells expand so it curls immediatly after cut...

Okay final question.
Why are the celeary stalks curved when they are cut length wise with a blade? Anyone?

 

[kirann]

what are the 3 uses of water by plant at night?

 

[Uchiha-Sasuke]

View attachment 41322

1.the arrow is kinda going lower than the eye level I assume that's an error..right ? also the MS says "length clearly marked, from top or bottom of rings"
what's up with that ?
2. shouldn't the eye be close to ruler ?

 

[Awesome12]

what are the 3 uses of water by plant at night?

Used in respiration, and to maintain turgor.

 

[asadalam]

Used in respiration, and to maintain turgor.

Also to cool plant and provide medium for transport of sugars i guess(is water in the phloem tubes too?)

 

[Fate0]

1.the arrow is kinda going lower than the eye level I assume that's an error..right ? also the MS says "length clearly marked, from top or bottom of rings"
what's up with that ?
2. shouldn't the eye be close to ruler ?

Yeah that error thing is just a mistake. The length L should be at the eye level. And if the MS says it then it must be right. L should start from bottom of rings then.
And it's a 2d diagram. There's no way to make out how close/far. They just need to see the dotted line with the eye at a moderate distance. You can make it closer but it wont matter

 

[kirann]

Used in respiration, and to maintain turgor.

is this correct? to make cell wall and to make glucose?

 

[Fate0]

what is 'celeary'?

A vegetable that looks like brocolli or "dhanya".

 

[kirann]

if the temp is hgh then the rate of diffusion would be high or low?

 

[Uchiha-Sasuke]

Yeah that error thing is just a mistake. The length L should be at the eye level. And if the MS says it then it must be right. L should start from bottom of rings then.

If we have to measure length of spring why are we including the rings? + MS says: from top OR bottom of rings doesn't that make it ONE ring included ?
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s06_ms_4.pdf

 

[asadalam]

if the temp is hgh then the rate of diffusion would be high or low?

HighER

 

[Dark Destination]

Can our answers exceed the given line? Like if they're is available space, can we continue the answer underneath the lines?
Will it be accepted?

 

[Dark Destination]

How do we calculate magnification? .-.

And when making the drawing, what should we keep in mind? And how many labels to add?

And which width or height to measure? :/ There are different measurements that can be taken, won't the answer be different for every student?

 

[***amd***]

Can our answers exceed the given line? Like if they're is available space, can we continue the answer underneath the lines?
Will it be accepted?

no.

 

[***amd***]

How do we calculate magnification? .-.

And when making the drawing, what should we keep in mind? And how many labels to add?

And which width or height to measure? :/ There are different measurements that can be taken, won't the answer be different for every student?

remember the topic 'ratio and proportion' of maths? use it.

 

[Dark Destination]

remember the topic 'ratio and proportion' of maths? use it.

Okay, maths master

 

[asadalam]

How do we calculate magnification? .-.

And when making the drawing, what should we keep in mind? And how many labels to add?

And which width or height to measure? :/ There are different measurements that can be taken, won't the answer be different for every student?

Keep in mind the marks,e.g if its of 6 marks,there will be usually 3 for drawing and 3 for labelling so we have to label 3 parts.We should take the maximum length of the object and our drawing and this is usually the diagonal length(/),unless otherwise stated or a line given to measure.We should note our length and its length and divide e.g 50/20=2.5x magnified.If object is already magnified we will also multiply that like if 1000x times we will give 2.5 X 1000=2500x magnfication

 

[Dark Destination]

Keep in mind the marks,e.g if its of 6 marks,there will be usually 3 for drawing and 3 for labelling so we have to label 3 parts.We should take the maximum length of the object and our drawing and this is usually the diagonal length(/),unless otherwise stated or a line given to measure.We should note our length and its length and divide e.g 50/20=2.5x magnified.If object is already magnified we will also multiply that like if 1000x times we will give 2.5 X 1000=2500x magnfication

So diagonal length always. But won't we get the same answer by using even the shortest length?
It's actually the ratio between any two proportional corresponding sides.

And it should be in mm right??

 

[Talha Farooqui BSS]

Keep in mind the marks,e.g if its of 6 marks,there will be usually 3 for drawing and 3 for labelling so we have to label 3 parts.We should take the maximum length of the object and our drawing and this is usually the diagonal length(/),unless otherwise stated or a line given to measure.We should note our length and its length and divide e.g 50/20=2.5x magnified.If object is already magnified we will also multiply that like if 1000x times we will give 2.5 X 1000=2500x magnfication

mag is equal to
image over object

 

[Talha Farooqui BSS]

any guese guys/....?????