Physics, Chemistry and Biology: Post your doubts here!

[princess sofia]

how can auxins be used as weed killers?

auxin increase the rate of growth as a result to provide energy the rate of metabolic activity increases
the food is being used up faster than it cn b made hence due to shortage of food , weed dies

 

[qazmed]

in bar charts , the x-axis must be started from 0 or i can just start it at 6 for example

 

[Mavilda Bucket]

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.

thnx alottttt

 

[Ameena Eesa]

in bar charts , the x-axis must be started from 0 or i can just start it at 6 for example

if you start it from 6, make sure you make a zig-zag line before it. The same can be done for the y-axis.





Then plot the bars over it

 

[Ameena Eesa]

CLICK ME​

Have you any bio6 solved papers?

 

[mohabxD]

describe negative feedback briefly, please

 

[My Name]

describe negative feedback briefly, please

i dont think that wil come fortoms xam

 

[princess sofia]

describe negative feedback briefly, please

it is an opposite reaction to a change
eg, increase in blood glucose level, it is a change
liver adjusts it to normal , thx is negative feed back

 

[princess sofia]

solve 2c of 0610_w02_qp_6.pdf

 

[Harsh Poddar]

I've made this site that can help you to quickly access past papers for a few common subjects. Try it out and please give feedback.

IGCSE: http://tinyurl.com/igcsepaper
AS & A Level: http://tinyurl.com/ciepaper

 

[Ameena Eesa]

describe negative feedback briefly, please

A change that acts oppositely to an ongoing process. For eg, if your blood glucose levels are rising, your body will try to cause a change that will make the rising blood glucose fall........... thus pancreas release insulin to convert the glucose for storage as glycogen............

 

[Ameena Eesa]

A change that acts oppositely to an ongoing process. For eg, if your blood glucose levels are rising, your body will try to cause a change that will make the rising blood glucose fall........... thus pancreas release insulin to convert the glucose for storage as glycogen............

oh again i didnt see..........someone replied already.......... how is this site//////// doesnt show latest msgs

 

[Ameena Eesa]

I've made this site that can help you to quickly access past papers for a few common subjects. Try it out and please give feedback.

IGCSE: http://tinyurl.com/igcsepaper
AS & A Level: http://tinyurl.com/ciepaper

nice

 

[Ameena Eesa]

can anyone explain me what's the difference bw practical and experimental sources of improvements and inaccuracies?...............

 

[Awesome12]

can anyone explain me what's the difference bw practical and experimental sources of improvements and inaccuracies?...............

Practical errors are basically those involved while setting up the apparatus. eg. not connecting wires properly to battery
Experimental involve those
Determinate (Systematic) Error
Indeterminate (Random) Errors
And personal carelessness

 

[rida.12.!!]

as salam o alaikum
hi guys!!
some more silly questions:
1) in the future the extraction of mineral resources in the antartic might occur on a large scale. This could destroy the breeding grounds of the ross seal.
(i) state and explain what effects this might have on the population of Leopard seal??
(ii)State and explain what effect this might have on the population of fish???

2) suggest what causes cloud formation??
3) describe the role of nitrifying bacteria in the nitrogen cycle??
4)MAY/JUNE 2013 P32 QUESTION NO 2 !!!
plz answer thx a lot!!

 

[Mavilda Bucket]

whats osmoregulation, pls rep quick

 

[Muhammad_Hamza]

I want Solution to this Part... in detail for three marks

 

[Ameena Eesa]

whats osmoregulation, pls rep quick

Osmoregulation is the active regulation of the osmotic pressure of an organism's fluids to maintain the homeostasis of the organism's water content; that is, it keeps the organism's fluids from becoming too diluted or too concentrated. Osmotic pressure is a measure of the tendency of water to move into one solution from another by osmosis. The higher the osmotic pressure of a solution, the more water tends to move into it. Pressure must be exerted on the hypertonic side of a selectively permeable membrane to prevent diffusion of water by osmosis from the side containing pure water.

 

[Thought blocker]

Osmoregulation is the active regulation of the osmotic pressure of an organism's fluids to maintain the homeostasis of the organism's water content; that is, it keeps the organism's fluids from becoming too diluted or too concentrated. Osmotic pressure is a measure of the tendency of water to move into one solution from another by osmosis. The higher the osmotic pressure of a solution, the more water tends to move into it. Pressure must be exerted on the hypertonic side of a selectively permeable membrane to prevent diffusion of water by osmosis from the side containing pure water.

Oye, Wikipedia hai kya tu ?