Physics, Chemistry and Biology: Post your doubts here!

[Ahmed Khider]

I know my explanation is right trust me..Its from a book!

And if u say that oestrogen is used to repair the lining then how is it built in the 1st place???????????

 

[Rahma Abdelrahman]

tyvm
i have another question srry for may/june 1994 Q.17 and Q.40 and for Q.4 are the sepals rlly removed after fertilisation??

Q 17, B, as glucose is absorbed by the ileum so its conc. is max. at the hepatic portal vein..
Q 40, I asked someone before, they said C, I thunk it IS C, what do u think?
Q4, generally Yes , but I don't know for this Q. !

 

[Ahmed Khider]

And if u say that oestrogen is used to repair the lining then how is it built in the 1st place???????????

Read the following sentence>>These hormones stimulate the ovaries to secrete oestrogen hormone, the function of this hormone is to rebuild the lining of the uterus again once menstruation is finished.
I copied it from here http://www.xtremepapers.com/revision/gcse/biology/reproduction.php

 

[Abu mota]

And if u say that oestrogen is used to repair the lining then how is it built in the 1st place???????????

repair the broken uterus lining means building it :/

 

[Ahmed Khider]

repair the broken uterus lining means building it :/

And thats what i said..i said oestrogen builds up the uterus lining :/

 

[Abu mota]

Ok..U knw that ovulation is the release of the egg from the ovary. When an egg is released from the ovary the amount of oestrogen increases to build up the uterus lining just in case fertiliztion occurs..along with that the amount of progesterone also increases to maintain the thickness of the uterus lining also if fertilization occurs.

ok i will show u what is wrong on what u said, first of all the uterus lining is repaired by the oestrogen which is released by the follicle, the oestrogen also stimulates ovulation, and so before ovulation the lining is actually fully repaired, and u can see that from the question and u can see that after ovulation there is no further repairing as after ovulation the corpus lateum is formed this then makes progestrone and progestrone is also needed to stop further ovulation. ty

 

[Abu mota]

Q 17, B, as glucose is absorbed by the ileum so its conc. is max. at the hepatic portal vein..
Q 40, I asked someone before, they said C, I thunk it IS C, what do u think?
Q4, generally Yes , but I don't know for this Q. !

tyvm, and yes, fior Q.4 the sepal is removed and for Q.40 yea u r right, i made a stupid mistake. ty again

 

[Ahmed Khider]

ok i will show u what is wrong on what u said, first of all the uterus lining is repaired by the oestrogen which is released by the follicle, the oestrogen also stimulates ovulation, and so before ovulation the lining is actually fully repaired, and u can see that from the question and u can see that after ovulation there is no further repairing as after ovulation the corpus lateum is formed this then makes progestrone and progestrone is also needed to stop further ovulation. ty

Ok ill show what is wrong in what u say..Oestrogen doesnt repairrrr the uterus lining it builds it from scratchhhh and u can c this in the graph where in the 1st week the uterus lining is being built not REPAIRED and in the same week the level of oestrogen increases!!

 

[Abu mota]

Ok ill show what is wrong in what u say..Oestrogen doesnt repairrrr the uterus lining it builds it from scratchhhh and u can c this in the graph where in the 1st week the uterus lining is being built not REPAIRED and in the same week the level of oestrogen increases!!

REPAIR=BUILD they are approx the same words, the uterus lining is broken and then it repairs it!!!! just like when u repair a car, it gets broken and u repair it, u dont build it because it already exists!!

 

[Abu mota]

repair: is to restore or renew ​

link:http://dictionary.reference.com/browse/repair?s=t​

 

[Ahmed Khider]

REPAIR=BUILD they are approx the same words, the uterus lining is broken and then it repairs it!!!! just like when u repair a car, it gets broken and u repair it, u dont build it because it already exists!!

LOL OK fine!!

 

[FATIMAH]

plz reply as fast as possible !! thnx in advance

 

[Ahmed Khider]

plz reply as fast as possible !! thnx in advance View attachment 12665

An enzyme is a biological catalyst that speeds up the rate of the reaction. I guess that answers your question

 

[FATIMAH]

An enzyme is a biological catalyst that speeds up the rate of the reaction. I guess that answers your question

yeah i got it that D is correct !! but i mean b can also be correct!! r8 according to the reason i gave !!!

 

[FATIMAH]

An enzyme is a biological catalyst that speeds up the rate of the reaction. I guess that answers your question

thank u soo much for a quick reply !!

 

[Abu mota]

thank u soo much for a quick reply !!

no B isnt correct at all, u break the substrate into products not products into substrate

 

[AAnsarii]

Wats needed in the diet of a person workin hard on a hot day?
high energy ,protein & extra water (Are all of the 3 needed?)
& http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Biology (0610)/0610_w05_qp_1.pdf q15 , why not C?

yup, all 3 r needed

 

[AAnsarii]

19) D - the oxygen level drops in the first test tube due to the germinating seeds, causing the water level to rise.
20)D - salts and urea are carried by the blood (remember renal arteries), hormones are usually carried by blood.
38)B - You have to learn the phases.

thz, they're difficult/imp qns, i got 1 wrong

 

[AAnsarii]

Well here B & C make no sense
The loss of energy is not just due to respiration so it's D As by 4th trophic level most of the enrgy will be lost..

hey, loss of energy is due to respiration, i guess...but it's not a 'result' as dey're askin, so D is ryt
notify if im rong

 

[MARWA 1234]

Which Varient are you AAnsarii?