A level Biology: Post your doubts here!

[Amy Bloom]

For this year AS here is a copy from the syllabus !

u're great thanks a ton! u made my task easier.

 

[Alice123]

Outline the properties of some bacteria which make them suitable for use in the extraction of heavy metals from their ores -4marks
please answer. Thanks in advance

 

[Amy Bloom]

Hey Malik777
here are my personal notes, u may find it few but this is what i learned before exams. I summarised everything so that at the end of A2 I didn't have much bulky notes. This is what i have compiled so far. I modified it according to PhyZac brother's syllabus requirements he gave. Hope this helps you. If you have any question or doubt, please do ask.

 

[Malik777]

TY :

Hey Malik777
here are my personal notes, u may find it few but this is what i learned before exams. I summarised everything so that at the end of A2 I didn't have much bulky notes. This is what i have compiled so far. I modified it according to PhyZac brother's syllabus requirements he gave. Hope this helps you. If you have any question or doubt, please do ask.

TY _

 

[PhyZac]

Outline the properties of some bacteria which make them suitable for use in the extraction of heavy metals from their ores -4marks
please answer. Thanks in advance

Some metal ore are form of sulphide. Some types of bacteria are able to obtain energy by converting sulphide to soluble sulphates, by an oxidation reaction. The ore are crushed, becteria are added. Water is allowed to flow through the ore washing out the soluble metal sulphate the bacteria have produced.

 

[strangerss]

And please, i forgot to tell you, do your layers (tissues) proportionately: Each layer of cells in your drawing must be proportionate as the layers are in the diagram provided, you get it?

There is no really spongy mesophyll layer here because there are no large intercellular air spaces in between. In the micrograph you can only see clearly the: cuticle, upper and lower epidermis, the vascular bundle, the palisade mesophyll layer.

u're welcome, sure do post em.

yes I got it , here it is ...

 

[PhyZac]

yes I got it , here it is ...

Amy Bloom will give better comments

but i have some comments,

You dint show the vascular bundles, and your lines have to be drawn once, i see at place light second layer of line, avoid that!

 

[Amy Bloom]

TY :
TY _

u're welcome

 

[Amy Bloom]

yes I got it , here it is ...

Yeah u're right PhyZac
So here are my comments. I'll be honest with you.
- vascular bundles are missing
- few details
- proportionality not much respected. see your cuticle is thicker "than usual"
- labellings missing
- the line in the middle does not continue.
- Else, ur lines are neat
- avoid the "scribbles" you did in the lower epidermis
I'll post a drawing soon to help you a bit. Don't worry you need to practice a lot before reaching to perfection. btw when is your exam?

 

[Amy Bloom]

strangerss and PhyZac - check this please.

 

[daredevil]

Some metal ore are form of sulphide. Some types of bacteria are able to obtain energy by sulphide to soluble sulphates, by an oxidation reaction. The ore are crushed, becteria are added. Water is allowed to flow through the ore washing out the soluble metal sulphate the bacteria have produced.

is this in A1 or A2??

 

[daredevil]

strangerss and PhyZac - check this please.
View attachment 22519

question: why is there a circle on the right?

and don't make zig zag or wavy lines like u did around vascular bundles ... the lines should be smooth. otherwise ask PhyZac and strangerss

 

[Amy Bloom]

is this in A1 or A2??

A2

 

[Amy Bloom]

question: why is there a circle on the right?

and don't make zig zag or wavy lines like u did around vascular bundles ... the lines should be smooth. otherwise ask PhyZac and strangerss

See on the micrograph you have a region of cells which are not clear, its just diffused/not clear. so i thought to draw it.
Well i think that the zig zag lines/wavy lines will not affect marking as such because the cells there are not that perfectly smooth. I didn't do it much. so its okay i think. Thanks for reminding.

 

[PhyZac]

question: why is there a circle on the right?

and don't make zig zag or wavy lines like u did around vascular bundles ... the lines should be smooth. otherwise ask PhyZac and strangerss

I too believe that drawing the circle was kind of correct, it actually depend on your specimen, if you see a distinctive difference in color as in the diagram, u better draw it. But if you dont draw it either wont be a mistake because it isnt so clear.

I was taught to draw it according how i see, and from diagram, i believe it kinda wavy. I am not sure, but learn the fact "Draw wat you see, NOT wat u saw"

 

[dornam]

See on the micrograph you have a region of cells which are not clear, its just diffused/not clear. so i thought to draw it.
Well i think that the zig zag lines/wavy lines will not affect marking as such because the cells there are not that perfectly smooth. I didn't do it much. so its okay i think. Thanks for reminding.

Hey, thank you for the infectious disease notes! Do you have notes on any other chapter, AS or A2?

 

[Amy Bloom]

Hey, thank you for the infectious disease notes! Do you have notes on any other chapter, AS or A2?

No problem.
The thing is that ALL my notes are hardcopies and my notes are like bits of papers here and there. Tell me some specific chapter where i can put some explanations of my own and compile some of my personal notes.

 

[Amy Bloom]

I too believe that drawing the circle was kind of correct, it actually depend on your specimen, if you see a distinctive difference in color as in the diagram, u better draw it. But if you dont draw it either wont be a mistake because it isnt so clear.

I was taught to draw it according how i see, and from diagram, i believe it kinda wavy. I am not sure, but learn the fact "Draw wat you see, NOT wat u saw"

Exactly PhyZac i agree with you.

 

[Amy Bloom]

I too believe that drawing the circle was kind of correct, it actually depend on your specimen, if you see a distinctive difference in color as in the diagram, u better draw it. But if you dont draw it either wont be a mistake because it isnt so clear.

I was taught to draw it according how i see, and from diagram, i believe it kinda wavy. I am not sure, but learn the fact "Draw wat you see, NOT wat u saw"

and yeah daredevil, i was taught too to draw it according to how i see, as PhyZac said. yeah its quite wavy brother.

 

[dornam]

No problem.
The thing is that ALL my notes are hardcopies and my notes are like bits of papers here and there. Tell me some specific chapter where i can put some explanations of my own and compile some of my personal notes.

Especially immunity if you can...