- Messages
- 2
- Reaction score
- 0
- Points
- 1
moral of the story..no one's sure..so study everything..that's what i'm doing
what to study?
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BIOLOGY P33 GUESS NEEDED!!!!HELP PLEASE!!!07 NOV 2013 !!! 9709/33
- Thread starter abdul arham
- Start date
what to study?
- Messages
- 54
- Reaction score
- 4
- Points
- 8
the problem: there's too much and what to revise?/moral of the story..no one's sure..so study everything..that's what i'm doing
- Messages
- 88
- Reaction score
- 85
- Points
- 18
MICROSCOPY!!!
1)propotion of thickness must be correct.
2)draw the organelles where u see them, dont just draw anywhere within the cell! never draw what u know.
3)whenever u see the plant cells, draw the cell walls.
4)IN PLAN DIAGRAMS, NO DRAWING OF ANY CELLS, AND NO SHADING...if u'll do either of them, u'll lose the whole mark!!
5)when asked to draw 2 cells, draw the ones that are easiest to draw. and dont draw more then 2 cells!
6)fraw the adjacent (touching) cells.
7)drawing should be large, unshaded.
8)in plan diagrams show the relative thickness of each layer.
9)draw the exact shape, if its oval or round or has wavy outlines
10)label the diagram...simplest thing to label is cytopasm, nucleus and cell membrane.
11)if its a trachea cell, then label goblet cells, cilia, blood vessels, muscular tissue, cartilage cells (lacunae)
12) when asked to compare 2 diagrams....make a table (drawing a table itself has 1 mark!)....put atleast one similarity
1)propotion of thickness must be correct.
2)draw the organelles where u see them, dont just draw anywhere within the cell! never draw what u know.
3)whenever u see the plant cells, draw the cell walls.
4)IN PLAN DIAGRAMS, NO DRAWING OF ANY CELLS, AND NO SHADING...if u'll do either of them, u'll lose the whole mark!!
5)when asked to draw 2 cells, draw the ones that are easiest to draw. and dont draw more then 2 cells!
6)fraw the adjacent (touching) cells.
7)drawing should be large, unshaded.
8)in plan diagrams show the relative thickness of each layer.
9)draw the exact shape, if its oval or round or has wavy outlines
10)label the diagram...simplest thing to label is cytopasm, nucleus and cell membrane.
11)if its a trachea cell, then label goblet cells, cilia, blood vessels, muscular tissue, cartilage cells (lacunae)
12) when asked to compare 2 diagrams....make a table (drawing a table itself has 1 mark!)....put atleast one similarity
- Messages
- 88
- Reaction score
- 85
- Points
- 18
depend on question
SOURCES OF ERRORS!
1.temp nt controlled
2.pH not controlled or nt measured accurately
3.difficulty in judging the colour.
4.difficulty in having the same time
5.inaccuracy in preparing serial dilution
6.inaccuracy of equipment, fr e.g. pipette/syringe
7.too short time.
8.evaporation of the solution which can cause the concentration to change.
SOURCES OF ERRORS!
1.temp nt controlled
2.pH not controlled or nt measured accurately
3.difficulty in judging the colour.
4.difficulty in having the same time
5.inaccuracy in preparing serial dilution
6.inaccuracy of equipment, fr e.g. pipette/syringe
7.too short time.
8.evaporation of the solution which can cause the concentration to change.
- Messages
- 88
- Reaction score
- 85
- Points
- 18
ok which diagram u need help
- Messages
- 88
- Reaction score
- 85
- Points
- 18
depend on question
LIMITATIONS OF ERRORS!
1.measure the volume accurately using syringe with narrow range of calibration
2.repeat more times at each pH/conc./temp
3.use range of pH/conc./temp
4.accurate specific measuring devices
5.use colorimeter to measure the degree of colourness.
6.use buffer to control pHs
7.use of water bath/thermostat to control temp
8.use thermometer to measure the temp.
9.thermostatically controlled environment.
10.repeat with each conc.
11.volume of the sample(e.g. enzyme/substrate) must be the same..cuz as volume increases, conc also increases
12.keep only one factor different, and all others must be the same.
LIMITATIONS OF ERRORS!
1.measure the volume accurately using syringe with narrow range of calibration
2.repeat more times at each pH/conc./temp
3.use range of pH/conc./temp
4.accurate specific measuring devices
5.use colorimeter to measure the degree of colourness.
6.use buffer to control pHs
7.use of water bath/thermostat to control temp
8.use thermometer to measure the temp.
9.thermostatically controlled environment.
10.repeat with each conc.
11.volume of the sample(e.g. enzyme/substrate) must be the same..cuz as volume increases, conc also increases
12.keep only one factor different, and all others must be the same.
- Messages
- 88
- Reaction score
- 85
- Points
- 18
GRAPHS!
1.the value which is varying is always on the y-axis while the constant value is on the x-axis.
2.no unbroken lines
3.it must be neat and thin
4.the points can be joined using a ruler or by hand
5.do not draw beyond the plotted points.
6.blobs or centre points more than 1mm are NOT acceptable
7.if zero is present in the reading, ur graph MUST pass through zero.
8.label both axis!
9.use appropriate units
10.use appropriate scale
11.use sharpened pencil to plot
12.plot the dots within circles, of equal sizes, must be clear and not too big.
1.the value which is varying is always on the y-axis while the constant value is on the x-axis.
2.no unbroken lines
3.it must be neat and thin
4.the points can be joined using a ruler or by hand
5.do not draw beyond the plotted points.
6.blobs or centre points more than 1mm are NOT acceptable
7.if zero is present in the reading, ur graph MUST pass through zero.
8.label both axis!
9.use appropriate units
10.use appropriate scale
11.use sharpened pencil to plot
12.plot the dots within circles, of equal sizes, must be clear and not too big.
What details to we include when doing a plan drawing or drawing a high power drawing?
- Messages
- 88
- Reaction score
- 85
- Points
- 18
good biology notes
Thank u
- Messages
- 88
- Reaction score
- 85
- Points
- 18
read the previous notes which i posted where u sit for exam?Thank u
- Messages
- 88
- Reaction score
- 85
- Points
- 18
Guess about question 2?
- Messages
- 88
- Reaction score
- 85
- Points
- 18
plz do something ? i was so scared about question 2
plz some quick guidelines about Q2
- Messages
- 54
- Reaction score
- 4
- Points
- 8
- Messages
- 16
- Reaction score
- 6
- Points
- 3
inaccuracies in preparing serial dilution
different starting time
inaccuracies in end time determination
external temperature effects enzyme or osmosis process
- Messages
- 16
- Reaction score
- 6
- Points
- 3
you dont need to worry for experiment 1..the instructions will be given..out of 6 in the table you will get 3 marks if you draw table and give headings properly..3 marks only for observation..so number 1 is no problem..just memorise the errors and improvements.the problem: there's too much and what to revise?/
- Messages
- 16
- Reaction score
- 6
- Points
- 3
dont worry for experiment 1..just follow every instruction..draw table and give headings properly..even if your observations are wrong maximum 2 marks will be deducted..and just memorise the errors and improvements.that is enough for no. 1
- Messages
- 54
- Reaction score
- 4
- Points
- 8