POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

[saroooor]

nope...i mean in sexual reproduction...flowers are either insect pollinated or wind pollinated...in insect pollinated flowers not all of the anthers/pollen grains reach the sticky stigma...some may be left over on the bodies of insects...which means that there are more pollen grains as some of them are lost!
same is the case with wind pollinated flowers....they are carried by wind so they can be scattered everwhere...

i hope this clears your doubt

I know what you are saying ,The main thing that would happen wether in insect or wind pollination it will land on the stigma so more male than female since there is a certain amount inside the ovary of the flowering plant unlike pollens which are produced in large amount from the anther inside pollen sacs ,anyways I understood . Thank you .

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

I know what you are saying ,The main thing that would happen wether in insect or wind pollination it will land on the stigma so more male than female since there is a certain amount inside the ovary of the flowering plant unlike pollens which are produced in large amount from the anther inside pollen sacs ,anyways I understood . Thank you .

yeahp...you understood right!
Your Welcome

 

[Rahma Abdelrahman]

Nope it should be B hydrated CoCl2 is pink and it is an exothermic reaction as forming of bonds will give energy. Steam will trick you as it will increase the temperature so the opposite reaction will have to be decrease but it doesn't depend on steam it depends if the bonds were broken or formed

Oh! understood, thanks, I think I was not concentrating !!

 

[Rania MD]

Hey, so I have collected all my doubtful questions in Biology paper 1 and I am hoping if one of you guys could really help me with them.
(1)- http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Biology (0610)/0610_w10_qp_11.pdf (Q.23)
(2)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Biology%20(0610)/0610_w03_qp_1.pdf (Q.13)
(3)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Biology%20(0610)/0610_w02_qp_1.pdf (Q.11 and Q.21)
Thanks, much appreciated!

 

[pk1947]

can anyone plzzzzzzz upload the ms for winter 2002 qp1..??? pleaseee

 

[Razo513]

Hey, so I have collected all my doubtful questions in Biology paper 1 and I am hoping if one of you guys could really help me with them.
(1)- http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Biology (0610)/0610_w10_qp_11.pdf (Q.23)
(2)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Biology%20(0610)/0610_w03_qp_1.pdf (Q.13)
(3)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Biology%20(0610)/0610_w02_qp_1.pdf (Q.11 and Q.21)
Thanks, much appreciated!

1) vasconstriction occurs means that the blood will be derived away from the skin's surface which means that blood flowing in Y & Z will decrease answer is therefore A
2) to understand reason of leaf wilting u should consider the concept of transpiration . for transpiration to occur there should be pressure (difference in pressure between the inside & outside of the plant which causes difference in potential gradient which then causes the water uptake) anyway u should that Without water, the cells lose their internal pressure and the leaf wilts the answer is B
3) for Q11 ) u will eliminate C & D u will be left with A & B and both have effects on the enzyme activity but notice the graph doesn’t start from zero so it cant be temperature therefore it’s A
Q21) u know that deocsification of harmful substances takes placed in the liver so the blood coming out of the liver will contain the breakdown products of alcohol the answer is D

 

[Razo513]

can anyone plzzzzzzz upload the ms for winter 2002 qp1..??? pleaseee

 

[pk1947]

View attachment 12306

thanku sooooooooo mchh

 

[Razo513]

thanku sooooooooo mchh

anytime

 

[Rania MD]

1) vasconstriction occurs means that the blood will be derived away from the skin's surface which means that blood flowing in Y & Z will decrease answer is therefore A
2) to understand reason of leaf wilting u should consider the concept of transpiration . for transpiration to occur there should be pressure (difference in pressure between the inside & outside of the plant which causes difference in potential gradient which then causes the water uptake) anyway u should that Without water, the cells lose their internal pressure and the leaf wilts the answer is B
3)for Q11 ) u will eliminate C & D u will be left with A & B and both have effects on the enzyme activity but notice the graph doesn’t start from zero so it cant be temperature therefore it’s A
Q21) u know that deocsification of harmful substances takes placed in the liver so the blood coming out of the liver will contain the breakdown products of alcohol the answer is D

Thanks you very much , that was really helpful ( :

 

[Razo513]

Thanks you very much , that was really helpful ( :

anytime

 

[Rahma Abdelrahman]

Hey, so I have collected all my doubtful questions in Biology paper 1 and I am hoping if one of you guys could really help me with them.
(1)- http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Biology (0610)/0610_w10_qp_11.pdf (Q.23)
(2)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Biology%20(0610)/0610_w03_qp_1.pdf (Q.13)
(3)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Biology%20(0610)/0610_w02_qp_1.pdf (Q.11 and Q.21)

1- A, Blood flow decreases to both areas.
2- B, internal pressure is lost
3- A, pH
D, as detoxification is done by liver.

 

[Evangeline]

does anyone have the corrected papers of may june 2012 that we did earlier because someone posted maths p2 and4 so i wonder if any others are out than ks the person posted the exam solved.

 

[L-Girl]

question 17, November 2002 in bio
can someone help me? why is it A not C?

 

[Rania MD]

I have some chemistry questions too, if any of you doesn't mind to answer them I'd be very grateful !
(1)- What is the pH of ethanol?(or an alkanol in general)
(2)-Summer 2002(file attached below)-Q.12
(3)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_w03_qp_1.pdf (Q.16)
(4)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_w11_qp_11.pdf (Q.19)
(5)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_w08_qp_1.pdf (Q.22) AND (Q.33=In this particular question, I am sure that NO2 doesn't form as a result of burning fossil fuels, rather from the really hot temperature inside the car engine which forces nitrogen and oxygen molecules in air to bind strongly. But the answer doesn't follow so, why ?!)
(6)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_s11_qp_13.pdf (Q.35= I really don't get this one)
Thanks in advance to all who will help ( : ( :

 

[Rania MD]

question 17, November 2002 in bio
can someone help me? why is it A not C?

because if you say C, you're suggesting that blood back flows from the ventricle into the atrium which can never happen as it's fatal if it does. Rather, the oxygenated blood passes from the lungs, while in the pulmonary vein, to the left atrium.

 

[L-Girl]

I have some chemistry questions too, if any of you doesn't mind to answer them I'd be very grateful !
(1)- What is the pH of ethanol?(or an alkanol in general)
(2)-Summer 2002(file attached below)-Q.12
(3)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_w03_qp_1.pdf (Q.16)
(4)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_w11_qp_11.pdf (Q.19)
(5)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_w08_qp_1.pdf (Q.22) AND (Q.33=In this particular question, I am sure that NO2 doesn't form as a result of burning fossil fuels, rather from the really hot temperature inside the car engine which forces nitrogen and oxygen molecules in air to bind strongly. But the answer doesn't follow so, why ?!)
(6)-http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_s11_qp_13.pdf (Q.35= I really don't get this one)
Thanks in advance to all who will help ( : ( :

1- it's neutral
2- bio or chem?
3- mass of lead oxide decreases as it is reduced and changes into lead, and mass of part y is increased as the hydrogen which passed through part x gained oxygen then passed through the flask.. so it's B
4- zinc oxide reacts with the acid, forming colourless solution. but copper will not react with the acid as it's below hydrogen in the reactivity series, so brown solid, which is the copper, remains. so it's B
5- 22: the litmus paper is changed from red to blue in experiment 1 due to the formation of ammonia, but in 2, neither chlorine nor ammonia is produced, this is because there's no reaction (i guess) between aqueous ammonium chloride and sulphuric acid. so there will be no change in experiment 2 and the answer is D
33: idk
6- idk

 

[L-Girl]

because if you say C, you're suggesting that blood back flows from the ventricle into the atrium which can never happen as it's fatal if it does. Rather, the oxygenated blood passes from the lungs, while in the pulmonary vein, to the left atrium.

thankssssssssss, that really helped me
btw if you looked at question 37 in november 1999 and in november 2002, both questions are similar i guess but the answers do not match... any ideas why? :/

 

[Rania MD]

thankssssssssss, that really helped me
btw if you looked at question 37 in november 1999 and in november 2002, both questions are similar i guess but the answers do not match... any ideas why? :/

send me the 1999 one because I dont have it

 

[Rania MD]

1- it's neutral
2- bio or chem?
3- mass of lead oxide decreases as it is reduced and changes into lead, and mass of part y is increased as the hydrogen which passed through part x gained oxygen then passed through the flask.. so it's B
4- zinc oxide reacts with the acid, forming colourless solution. but copper will not react with the acid as it's below hydrogen in the reactivity series, so brown solid, which is the copper, remains. so it's B
5- 22: the litmus paper is changed from red to blue in experiment 1 due to the formation of ammonia, but in 2, neither chlorine nor ammonia is produced, this is because there's no reaction (i guess) between aqueous ammonium chloride and sulphuric acid. so there will be no change in experiment 2 and the answer is D
33: idk
6- idk

ohh sooo sorry, here's the file: