Physics, Chemistry and Biology: Post your doubts here!

[Lost_Life]

Again! Organ...

SORRY, BUT, AGAIN,WHY?

 

[Maz]

SORRY, BUT, AGAIN,WHY?

Cause yesterday there was a HUGE debate on this itself.

 

[The sun]

for Q6. It,s the coronary artery as it carries glucose and oxygen to the heart muscle to carry aerobic respiration so answer is A
Q13 B is the correct ans. as all other answers INCREASES soil erosion

 

[Student of the year]

Guys I got a question 23:
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Biology (0610)/0610_w10_qp_11.pdf

the ans is a
bcz if the vessels at X contract blood flow will decrease & since the same blood is moving ahead at Y & Z , both will too have decreased blood flow.
hope u understood

 

[Rahma Abdelrahman]

oct/nov 1999 Q.18 and Q.37 is there something wrong in the ms or not?
may/june 1999 i dont understand Q.18 and Q.22
plz help and ty

For 18, i think it's B, I don't know about the ms.
For 37, Yes the ms is wrong, it is B not D!
June 1999, 18- the valve (or whtvr u call it) allows escape of CO2, but prevents entry of O2...in Chemistry! so answer is B.
22- it is C; auxin accumulates on the darker side--> but B will still have a bit of auxin at the top (observe that the label line includes the region of cell elongation)
btw, i did this mistake before!

 

[Lost_Life]

Cause yesterday there was a HUGE debate on this itself.

IM BEGINNING TO HATE ARTERIES NOW -__________________________________________________-

 

[Rahma Abdelrahman]

SORRY, BUT, AGAIN,WHY?

I don't mean U, it is just that i had some debate about this 2 days ago with someone here, Sorry

 

[Yousif Mukkhtar]

the ans is a
bcz if the vessels at X contracts blood flow will decrease & since the same blood is moving ahead at Y & Z , both will too have decreased blood flow.
hope u understood

Yes I did, thanks.

 

[Student of the year]

I don't mean U, it is just that i had some debate about this 2 days ago with someone here, Sorry

is artery an organ???

 

[Rahma Abdelrahman]

IM BEGINNING TO HATE ARTERIES NOW -__________________________________________________-

We all hated them already!

 

[thats_me]

oct/nov 1999 Q.18 and Q.37 is there something wrong in the ms or not?
may/june 1999 i dont understand Q.18 and Q.22
plz help and ty

abt 18 i think it's correct :S
37 is wrong it's B
18 : Co2 leaves as it is anaerobic respiration
22 : auxins acumulate in the darker side and produced from the tip ,so C is the side where light is ..

 

[Rahma Abdelrahman]

is artery an organ???

Yes, IT IS! it consists of several tissues. Check out this link!
http://www.bcb.uwc.ac.za/SCI_ED/grade10/manphys/vessel.htm

 

[Lost_Life]

can anyone help?
2000 Mj Question 21.. Why is it B not C ?

 

[Rahma Abdelrahman]

can anyone help?
2000 Mj Question 21.. Why is it B not C ?

Vessel X is the renal vein; blood here is leaving the kidneys, so obviously urea has bee removed while CO2 is more as the cells of the kidney respire releasing CO2

 

[Abu mota]

abt 18 i think it's correct :S
37 is wrong it's B
18 : Co2 leaves as it is anaerobic respiration
22 : auxins acumulate in the darker side and produced from the tip ,so C is the side where light is ..

but shudnt it take time for the breathe rate to increase? i mean when u do sport u dont breathe deep and fast that fast, it takes some time doesnt it?
also i have a question for O/N 2000 Q.23 X and Y are both pointing at the same exact thing :/

 

[Abu mota]

We all hated them already!

it is an organ, i did a paper today and it said what is the level of organisation of an artery and the answer was organ, i think it is may/june 1999 but im not sure though :/, it is an artery because it has a muscle tissue and an elastic tissue forming an organ

 

[thats_me]

but shudnt it take time for the breathe rate to increase? i mean when u do sport u dont breathe deep and fast that fast, it takes some time doesnt it?
also i have a question for O/N 2000 Q.23 X and Y are both pointing at the same exact thing :/

Yea so it's B it's starting to increase C is the point where the person is breathing very fast ..
No one is renal artery & the other is renal vein

 

[Abu mota]

Yea so it's B it's starting to increase C is the point where the person is breathing very fast ..
No one is renal artery & the other is renal vein

huh? Q.23 talks about the eye not the kidneys
and i dont know rlly about if it is B or A

 

[thats_me]

huh? Q.23 talks about the eye not the kidneys
and i dont know rlly about if it is B or A

lol i guess there's sumthin wrong with my eyes :O
May be its the printing prob or sumthin
X is a little further than Y so X is retina & Y is choroid

 

[Lost_Life]

Vessel X is the renal vein; blood here is leaving the kidneys, so obviously urea has bee removed while CO2 is more as the cells of the kidney respire releasing CO2

oh okay, thanks :3