Physics, Chemistry and Biology: Post your doubts here!

[Ameena Eesa]

View attachment 41065Label
: from
rachis / calamus / after feathers / vane / shaft / quill /
umbilicus / barb;


where to label these?

darling you dont need to know such intricate details, the ms just gives various options so that if any candiadate is highly read will not loose on the marks.

simply labelling feathers/midrib/ruffled feathers will get you your full marks.

 

[Lola_sweet]

some times in biology paper 6 they tell u to make a graph but they wont tell u wht type of graph, they will say 'using the figures from table xyz plot a graph'.
how do we know if its line graph, bar graph or histogram?

 

[Mai(M4!)]

i need the experiment showing co2 in inhaled and exhaled air

 

[Mai(M4!)]

some times in biology paper 6 they tell u to make a graph but they wont tell u wht type of graph, they will say 'using the figures from table xyz plot a graph'.
how do we know if its line graph, bar graph or histogram?

I'm not sure but whenever he needs bar chart and histogram he asks u to draw them otherwise he wants a line graph.

 

[mohabxD]

can someone please outline the steps of blood clotting, including the formation of scab, thanks..

 

[qazmed]

in magnification if they gave me the area of a drawing (eg 144) and said to convert actual area and magnification is ( eg x300) shouldi divide drawing by 300 squared. as it is area not length?

 

[princess sofia]

can someone please outline the steps of blood clotting, including the formation of scab, thanks..

1. the damaged tissues secrete thrombokinase protein
2. thrombokinase convert prothrombin protein present in blood int o thrombin
3. thrombin than converts soluble fibrinogen into insoluble fibrin
4. fibrin forms a mesh work over the wound and so prevent escaping of reb blood cells (thx is wt scalp is)
5. pphagocytes and lymphocytes reach the site and start phagocytosis
hope it helped

 

[princess sofia]

in magnification if they gave me the area of a drawing (eg 144) and said to convert actual area and magnification is ( eg x300) shouldi divide drawing by 300 squared. as it is area not length?

yes

 

[mohabxD]

1. the damaged tissues secrete thrombokinase protein
2. thrombokinase convert prothrombin protein present in blood int o thrombin
3. thrombin than converts soluble fibrinogen into insoluble fibrin
4. fibrin forms a mesh work over the wound and so prevent escaping of reb blood cells (thx is wt scalp is)
5. pphagocytes and lymphocytes reach the site and start phagocytosis
hope it helped

yes it did! thank you very much

 

[Mai(M4!)]

i need the experiment showing co2 in inhaled and exhaled air

 

[Ameena Eesa]

can someone please outline the steps of blood clotting, including the formation of scab, thanks..

1. Platelets accumulate at sight of cut
2. Release thrombin
3. Thrombin converts fibrinogen (soluble) from the plasma to fibrin
4. Fibrin is insoluble
5. Plugs blood flow
6. Prevents bacteria entering
7. With time, wound heals.

 

[Ameena Eesa]

1. Platelets accumulate at sight of cut
2. Release thrombin
3. Thrombin converts fibrinogen (soluble) from the plasma to fibrin
4. Fibrin is insoluble
5. Plugs blood flow
6. Prevents bacteria entering
7. With time, wound heals.

Oh..........i dint notice someone had already answered

 

[mohabxD]

Oh..........i dint notice someone had already answered

Lol its ok, this helped as well, now I have a clearer idea about the whole thing, so thanks

 

[Ameena Eesa]

Where are the cell bodies of

(a) Sensory neurones
(b) Motor neurones

located?>..........

 

[Mai(M4!)]

Where are the cell bodies of

(a) Sensory neurones
(b) Motor neurones

located?>..........

a)in the gangelion in the dorsal root
b)in the grey matter of the spinal cord

 

[totalljerkface]

solve 2c of 0610_w02_qp_6.pdf

 

[mohabxD]

how can auxins be used as weed killers?

 

[Lola_sweet]

solve 2c of 0610_w02_qp_6.pdf

Ascorbic acid is vitamin C so the test for vitamin C has to be used.
In my book the test for vitamin c is:
With the use of a syringe add juice drop by drop to a 2cm^3 of a 0.1 per cent solution of DCPIP (a blue dye) in a test-tube. The DCPIP will become colourless quite suddenly as the juice is added. The amount of juice added from the syringe should be noted down. Repeat the experiment with a different fruit juice. The more drops added to the fruit juice in order to decolourise DCPIP the less ascrobic acid (vitamin C) present in the juice.

i dnt think they ask this test anymore thou i hope it helped!

 

[Ameena Eesa]

how can auxins be used as weed killers?

Auxins are sprayed over the crops
Only weeds absorb it
Auxins cause excessive growth of weeds
The weeds are not able to accomodate with the sudden demand for nutrients for growth
Weeds die.

 

[shoaib672002]

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