Originally posted by Hellparadise:err... if i wrote the process of mitochondrion is to 'produce energy in the form of ATP' izzit correct???
I doubt so... Because they asked for the process that takes place there. Meaning a specific process with a name (i.e. respiration) haha.
ooooo ok thx =) lol
my 1 mark T_T
and...
i tot the number is 5094???
Confirming my answers :)
Can't remember the exact question but it's along the lines of,
(a) "In extremely cold conditions, the cells in fingers and toes die. This is frostbite. Explain why wearing thick gloves, socks and shoes does not prevent frostbite." [5]
I wrote that the constriction of arterioles and dilation of shunt vessels(why do these happen?) prevents the flow of blood to the capillaries in the skin, thereby cutting off blood supply to the skin. Fingers and toes contain capillaries. When the blood supply is cut off for too long, the cells in fingers and toes do not receive oxygen for respiration or nutrients vital for survival, and the cells will eventually die. This is frostbite. Thick gloves, socks and shoes only prevent heat loss through radiation or convection, and do not prevent the cutting off of blood supply to the skin. (I also added in redundant parts about the sweat production decreasing and metabolic rate increasing to lengthen my answer) --> better hope no excess denied
If all goes well, you get the 4-5 marks, depending. Because you didn't talk about why the arterioles constrict and more blood flows through the shunt vessels. It is to reduce heat loss through the skin in cold conditions by having less blood flowing under the skin.
(b) "In cold conditions, shivering takes place. Explain why this happens." [3]
When production of sweat is decreased, metabolic rate is increased and blood flow to the skin is stopped is not sufficient to reduce heat loss and increase body temperature back to normal, this stimulates us to shiver. Movements in the muscles warm the body up.
You don't seem to be answering the question directly in the first few lines.
(c) "Explain how the mechanics for control of body temperature are synchronised." [2]
They are synchronised by homeostasis. When the hypothalamus detects the body temperature rising above or falling to below average, the brain sends signals to various body parts to work to increase or decrease body temperature, depending on if the body temperature is below or above normal.
When I see this question, I thought it was something on negative feedback, well, never mind, I ain't sure anyway.
Something like that.
Just my own opinion.
Originally posted by Theguiltshow:I doubt so... Because they asked for the process that takes place there. Meaning a specific process with a name (i.e. respiration) haha.
When my friend said this, I countered him with this:
The question that states: Name the process that produces lactic acid.
"Well, are you gonna write RESPIRATION instead of ANAEROBIC RESPIRATION huh, wise guy?"
Originally posted by Garrick_3658:Just my own opinion.
Yeah I wrote it's to reduce heat loss. Along with the sweat/metabolic thing, all to reduce heat loss. I think my starting sentence was "When the body temperature falls to below normal..."
Thanks, anyway!
Originally posted by Garrick_3658:When my friend said this, I countered him with this:
The question that states: Name the process that produces lactic acid.
"Well, are you gonna write RESPIRATION instead of ANAEROBIC RESPIRATION huh, wise guy?"
Sorry, I don't seem to get your point.
Originally posted by Theguiltshow:Guys are the exact opposite, they're like emotionless (online)!
nah i dont think i am emotionless online. Like i type in caps when i am high on thanking someone. im like THANKS ALOT DUUUUDEEE!!! see my pattern thread for further details.
any body got answers to qns 3? if i remember correctly... i think i put 51 for part a and 40 mins for part b. then for the ecology question, i put 1200kj and 8% can someone confirm the answers with me?
Originally posted by dmssjack:any body got answers to qns 3? if i remember correctly... i think i put 51 for part a and 40 mins for part b. then for the ecology question, i put 1200kj and 8% can someone confirm the answers with me?
dmssjack, creatig a accout just for oe questio?
Ayway, 1200kj ad 8% i correct. That' what I put alo.
Pardo the weird pellig, apparetly, my Microoft wirele keyboard ha a problem with the letter 'a_d' & '_ake'.
heard from my teacher this bio paper difficult to score.
anyway, all those insulin, genetic engineering i nvr study!
heng ah!! nvr come out..
*opps*
IMO bio is a free frag paper. Its all about memorizing and regurgitating. If you master these, you get your A1. And for my class, almost everyone got A1 for Bio which was rather easy. My fren who studied the night b4 got his A1 as well.
Anyway how many topics are there for O's?
Originally posted by La Nina:IMO bio is a free frag paper. Its all about memorizing and regurgitating. If you master these, you get your A1. And for my class, almost everyone got A1 for Bio which was rather easy. My fren who studied the night b4 got his A1 as well.
Anyway how many topics are there for O's?
lol. 22 topics for bio. or 21? forget.
Anyway, this is new syllabus. You good in memorising doesnt mean u can do well. Almost all of the Section A is like application question.
Originally posted by Em:hey help me ask ur bio teacher ….hw many marks upon 80 fr tis paper can stand decent chance fr A1 ? thx
when i see her again ok? haha.. 13nov?
anyway, she mentioned b4, to get A1, paper 1 must get ard 36/40
As for getting an A1, she did mentioned b4 for our own sch paper must get 80++. Our school paper is set as same standard as the O lvl papers. but then tt was few months back. moreover we r the 1st batch taking new syllabus. so how accurate is her prediction, not too sure.
Seems to me like those who come for the aftermath report are all very clever ones. made me so demoralised. :'(
lol very clever ones eh.
I put plant X
Originally posted by dmssjack:I rmb got one qns they ask u which plant grows in the shade and explain(smt like that).. what u guys put as the answer? plant X or Y ?
I said Y. No more oxygen is produced from 25mins onwards, meaning no more photosynthesis takes place. Therefore sunlight is the limiting factor and plant Y is the one in the shade.
Am I wrong? :O
the one which is more adapted to produce oxygen in darker intensities.
Can't remember but I think is the one that do not have light has limiting factor since increasing light intensity do not have any effect on the plant.
The difference between X and Y(the one we drew) was that Y had more oxygen production before light intensity of 13.5. As the intensity increases, X had more oxygen produced, meaning more photosynthesis.
Evidently Y is the plant which is normally in shade because it is more adapted to surviving in darker places, because it has more photosyntehsis in lower intensity.
Kinda like why grass in direct sunlight are shorter.
I put Plant Y too. shizz.
I put Plant Y. Cos plants in shades dun get much sunlight. so not a lot chloroplast. blah blah blah..
Am i right??
i think my answer similar to yours...