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http://www.bbc.co.uk/schools/gcsebitesize/science/21c_pre_2011/food/harmfulchemicalsrev3.shtml
May beTrue, but I guess that litmus paper is different from universal indicator
but the ans is D 
it is stay still in Q because CO2 produced is the same as O2 taken it by the animals and so there is no change in pressure, however at P it takes away oxygen and CO2 and so the pressure reduces this causes the spot to move to the left at P and stay still at Q so the answer is B
welcumHahahaha : Yupp
Thank youuuu !
dat mks sense...
D it is sulfur dioxide because when u burn ethanol u release oxygen and water, however oxides of nitrogen and nitrogen occur and the fuel used has no effect on them, sulfur dioxide is the answer because it can only be made by the combustion of a sulfur containing fuel
so when u burn ne fuel, u get NOx?D it is sulfur dioxide because when u burn ethanol u release oxygen and water, however oxides of nitrogen and nitrogen occur and the fuel used has no effect on them, sulfur dioxide is the answer because it can only be made by the combustion of a sulfur containing fuel
yea ethanol doesnt contain sulfur, there is nothing to explain, all u have to know is ethanol produces CO2 and water when combusted and that oxides of nitrogen and nitrogen arent affect by the fuel used, they will always be available. only sulfur dioxide is affected by the fuel used and ethanol as i said before doesnt release sulfur dioxide when combusted and so it is sulfur dioxide.
yes, it isnt affected by the fuel, u only need a high temperature so that oxygen and nitrogen have enough energy to bond
i dont think u exactly need 2 noe what absorbs CO2, but combustion & respiration produce CO2. all organisms respire, so produce it
the answer is B, the palisade cells gain the most CO2 and lose the most CO2, idk why, i did it wrong when i did that paper :/
so what about A, it doesnt recieve ne CO2, so will have least? n D?
o sorry, i dunno if v need 2 lrn them...
its D because C is Egestion (removal of undigested food....to anus)
but they're asking you about excretion! thats different its the removal of TOXIC UNWANTED WASTE PRODUCTS...A.K.A. DIGESTED FOOD OUT OF THE BODY... understood?
THANK U
THANK U SOOOOOO MUCH.......CAN U PLZZZZZZZZZZ EXPLAIN THE OPENING AND CLOSING OF GUARD CELLS IN MORE DETAILS (LIKE WHEN DO THEY OPEN AND WHEN DO THEY CLOSE IN GENERAL I KNOW NOTHING ABOUT IT SO PLZZZZZZ HELP) AND FOR NUMBER 8 - UR LABELING R CORRECT BUT THERE IS NO CHOICE "FROM W TO Y" THE XYLEM IS THE DARKER CELL RIGHT???????? THANKSSSSSS AGAIN1 - removal of undigested food is egestion, not excretion; recall the definition of excretion
2 - I believe it is C, after ovulation
3 - As leaves have developed and the plant is able to photosynthesise
4 - Similar to soil erosion
5 - If you chose C, then you are suggesting that there is no bending, bending is due to unequal distribution of auxin.
6 - as cell wall is fully permeable and will allow any surrounding solution in, NOT Air!
7 - Answer is B, we discussed this previously in detail, this Q. is repeated in one of the recent papers and answer is B.
8 - Xylem is W and phloem is X, therefore water travels from W(xylem) to Y(stomata) during transpiration.
9 - Stomata is open during the day to absorb maximum CO2 for photosynthesis (if u hve further doubt on this ask again, I will explain in more detail!)
10 - Same as 1994 (explained above)
11 - Deforestation doesn't cause an increase in SO2 , actually SO2 has nothing to do with plants.
12 - I was earlier confused here too, but my last year's teacher said we have to choose the most appropriate answer.
Hope this helps
THANK U SOOOOOOOOOOOOOOOOOOOOOOOOO MUCH
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