Some Biology MCQ Questions Need Help
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1997
1) Which is the shortest route that can be taken by the blood travelling from a leg to an arm in the human body?
A leg-heart-lungs-heart-arm
B leg-heart-lungs-liver-arm
C leg-liver-heart-lungs-arm
D leg-lungs-heart-lungs-arm
My answer is A but the book's answer is B something wrong?
1998
2) Which changes take place as blood flows through muscles during a long period of exercise?
blood temperature - concentration of dissolved lactic acid
A decreases - decreases
B decreases - increases
C increases - decreases
D increases - increases
Why does the concentration of dissolved lactic acid increase?
My answer is C and the book's answer is D
1999
3) When is the sex of the baby determined?
A before ovulation
B between ovulation and fertilisation
C at the moment of fertilisation
D after the first division of the zygote
My answer is B and the book is C. No idea on this. o.o
2000
4) What will be most likely to produce flowers of the same type and colour?
A growing all the plants from seeds from one parent plant
B growing all the plants from cuttings from one parent
C growing all the plant at the same temperature
D growing all the plants in the same light intensity
Why is the answer B instead of A?
2001
5) Where is urea produced?
A bladder
B blood cells
C kidney
D liver
My answer is D but the answer is C o.o
???????
2003
6) Starch is digested to maltose by the enzyme amylase.
According to the 'lock and key' hypothesis, which is the 'key' and which is the 'lock'?
'Key' ---------- 'Lock'
A amylase ------------ maltose
B amylase-------------- starch
C starch-------------- amylase
D starch--------------- maltose
My answer is C but the book's answer is B. I thought the enzyme is the 'lock' as it stays unchanged throughtout the reaction????
(P.S there is another similar question to this one and the book also choose the 'key' to be the enzyme)????
2006
7) Some organisms live in the dark at the bottom of the seas and ,to synthesise glucose, use energy from chemicals in the very hot water that comes out of the volcanoes.
What is a distinguishing feature of these organisms?
A Their enzymes are easily dentaured by heat.
B They do not need carbon dioxide
C They do not need to be green
D They all obtain energy only by being carnivores
My answer is B but the book's is C. I don't quite understand this question..
OTHER QUESTIONS:
8) Is germination in syllabus?
9) When concentration of adrenaline in blood increases, will it lead to an increase in insulin in blood? (since there is a increase in blood glucose concentration)
10) Some features of the plant leaves are listed
1 hairs on lower surface
2 large surface area
3 waxy cuticle
Which features reduce water loss from the leaves?
A 1 and 2 only
B 1 and 3 only
C 1,2,3
D 2 and 3 only
My answer is B but the book's is A. Need some help..
Help will be kindly appreciated, Thank you all. (Bio paper on Thursday, hopefully can catch up)
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>>> 1997
1) Which is the shortest route that can be taken by the blood travelling from a leg to an arm in the human body?
A leg-heart-lungs-heart-arm
B leg-heart-lungs-liver-arm
C leg-liver-heart-lungs-arm
D leg-lungs-heart-lungs-arm
My answer is A but the book's answer is B something wrong? <<<
Your answer A is correct.
>>> 1998
2) Which changes take place as blood flows through muscles during a long period of exercise?
blood temperature - concentration of dissolved lactic acid
A decreases - decreases
B decreases - increases
C increases - decreases
D increases - increases
Why does the concentration of dissolved lactic acid increase?
My answer is C and the book's answer is D <<<
Because anaerobic respiration (in prolonged period of exercise) produces lactic acid.
>>> 1999
3) When is the sex of the baby determined?
A before ovulation
B between ovulation and fertilisation
C at the moment of fertilisation
D after the first division of the zygote
My answer is B and the book is C. No idea on this. o.o <<<
Fertilization. Because only at fertilization, will the actual sperm be identified. Some sperms carry X chromosome, some carry Y chromosome. Eggs always carry X chromosome.
>>> 2000
4) What will be most likely to produce flowers of the same type and colour?
A growing all the plants from seeds from one parent plant
B growing all the plants from cuttings from one parent
C growing all the plant at the same temperature
D growing all the plants in the same light intensity
Why is the answer B instead of A? <<<
Seeds are the result of sexual reproduction and fertilization. Even self-fertilization involves genetic recombination.
>>> 2001
5) Where is urea produced?
A bladder
B blood cells
C kidney
D liver
My answer is D but the answer is C o.o <<<
Liver beaks down excess amino acids to ammonia, which is converted to urea, which is excreted by the kidneys as urine.
>>> 2003
6) Starch is digested to maltose by the enzyme amylase.
According to the 'lock and key' hypothesis, which is the 'key' and which is the 'lock'?
'Key' ---------- 'Lock'
A amylase ------------ maltose
B amylase-------------- starch
C starch-------------- amylase
D starch--------------- maltose
My answer is C but the book's answer is B. I thought the enzyme is the 'lock' as it stays unchanged throughtout the reaction????
(P.S there is another similar question to this one and the book also choose the 'key' to be the enzyme)???? <<<
This is one part of the 'O' level syllabus that is dumb. The "key" and "lock" are simply models, and only the SPECIFICITY of the model makes sense. One can argue either way for which is the key and which is the lock.
>>> 2006
7) Some organisms live in the dark at the bottom of the seas and ,to synthesise glucose, use energy from chemicals in the very hot water that comes out of the volcanoes.
What is a distinguishing feature of these organisms?
A Their enzymes are easily dentaured by heat.
B They do not need carbon dioxide
C They do not need to be green
D They all obtain energy only by being carnivores
My answer is B but the book's is C. I don't quite understand this question.. <<<
They do not need chlorophyll, since there is no light to be absorbed.
>>> OTHER QUESTIONS:
8) Is germination in syllabus? <<<
Check yourself :
>>> 9) When concentration of adrenaline in blood increases, will it lead to an increase in insulin in blood? (since there is a increase in blood glucose concentration) <<<
Yes.
>>> 10) Some features of the plant leaves are listed
1 hairs on lower surface
2 large surface area
3 waxy cuticle
Which features reduce water loss from the leaves?
A 1 and 2 only
B 1 and 3 only
C 1,2,3
D 2 and 3 only
My answer is B but the book's is A. Need some help.. <<<
1 & 3. Large surface area increase water loss, but bo pian, because large surface area allows greater surface area to capture more light and absorb more carbon dioxide, both important for photosynthesis.
>>> Help will be kindly appreciated, Thank you all. (Bio paper on Thursday, hopefully can catch up) <<<
Welcome.
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>>> 2001
5) Where is urea produced?
A bladder
B blood cells
C kidney
D liver
My answer is D but the answer is C o.o <<<
Liver beaks down excess amino acids to ammonia, which is converted to urea, which is excreted by the kidneys as urine.
It's liver what. Kidney filters urea from the blood as part of the glomerular filtrate.
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>>> 9) When concentration of adrenaline in blood increases, will it lead to an increase in insulin in blood? (since there is a increase in blood glucose concentration) <<<
Yes.
So there is one question in 2002,
When is the secretion of insulin increased?
A after eating a chocolate cookie
B at the start of pregnancy
C just before the release of sperms
D when a person is angry
The answer is A but is D another possible answer?
Angry--- more adrenaline--- increase blood glucose concentration--- increased secretion of insulin
And also how do you know if the chocolate cookie contain a lot of glucose?
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It's common sense chocolate is sweet, thus contains a lot of glucose. You really need a lot of common sense in Science subjects instead of pure memorising, from my experience, that is.
Angry--- more adrenaline--- increase blood glucose concentration--- increased secretion of insulin
Unlikely. Your cells are using glucose up at the same time as well, so it somehow evens out.
Moreover, your "angry" has to caused by some fight-or-flight situation (a gang of guys grabbing your gf). So it is not applicable to all circumstances.
BTW the liver one, I think your book has the wrong answer. It really is liver la.
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Okay thanks
But what is your take on this one?
Starch is digested to maltose by the enzyme amylase.
According to the 'lock and key' hypothesis, which is the 'key' and which is the 'lock'?
'Key' ---------- 'Lock'
A amylase ------------ maltose
B amylase-------------- starch
C starch-------------- amylase
D starch--------------- maltose
My answer is C but the book's answer is B. I thought the enzyme is the 'lock' as it stays unchanged throughtout the reaction????
2 Questions have been repeated so far...
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Originally posted by Garrick_3658:
It's liver what. Kidney filters urea from the blood as part of the glomerular filtrate.
Garrick_3658 wrote :
>>> It's liver what. Kidney filters urea from the blood as part of the glomerular filtrate... BTW the liver one, I think your book has the wrong answer. It really is liver la. <<<
You didn't understand my sentence?>>> Liver beaks down excess amino acids to ammonia, which is converted to urea, which is excreted by the kidneys as urine. <<<
So yes, from my sentence, it's obvious that it's the liver which "produces" urea. It's only "excreted" by the kidneys. "Excretion" does not equal "production".
Peoplethinkimsarcastic wrote :
>>> So there is one question in 2002,
When is the secretion of insulin increased?
A after eating a chocolate cookie
B at the start of pregnancy
C just before the release of sperms
D when a person is angry
The answer is A but is D another possible answer?
Angry--- more adrenaline--- increase blood glucose concentration--- increased secretion of insulin
And also how do you know if the chocolate cookie contain a lot of glucose? <<<
The most DIRECT answer is eating a cookie, which as Garrick_3658 pointed out, is obviously high in sugar. Getting angry only directly secretes adrenaline (and then, even if you're angry enough to want to physically fight someone), and only subsequently after some time, insulin would be secreted as a response to the elevated glucose levels as a result of the adrenaline secretion.
So always choose the best or most direct answer to the question.
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Always remember, trust your judgment, those publishers are humans too (noob ones, I bet I can outrank them in terms of O lvl syllabus), so they make (stupid) mistakes sometimes (actually often, but I'll try to be nice).
Next thing to remember for lock and key, the substrate always goes to find the enzyme. So how do you unlock a lock (no pun)? You use a key to fit the lock. The key finds the lock, just like how the substrate finds the enzyme.
The answer is C. I cross-referenced from two textbooks.
Biology Insights by BTay (not really good, only good chapter is on Coordination and Response. I bet they went to hire some geologists to write the Ecosystem Theme, because the English used is SOOOO chim until I can barely understand. And they just rant on and on about diversity blah blah blah.)
Biology Matters by LamPK (this rocks, although it's too late, I reccommend you to reccommend to your juniors or something?)
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8) Is germination in syllabus?
NEVER EVER EVER. Then the paper would be do-able even by Primary School kids.
What book are you doing by the way? With so many wrong answers, perhaps it's time to trash it and trust yourself on the answers. I mean trash the answer sheet only ahh. Because my topical FYS also like that.
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Lol My whole school is using Biology Matters textbook.
Ya according to this textbook (and I have also cross-referenced to some other assesment books), the enzyme should be the 'lock'
Thanks a lot.
ADD ON: I'm using the TYS answer booklet answer key -_-
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Then I have one thing to say, YOUR SCHOOL ROCKS.
My school bought the BInsights, until I found out from my teacher that the other better book is BMatters. Weird she didn't suggest to the HOD of Science in the first place.
I mean which TYS? Which publisher?
BTW the TYS don't take answers from Cambridge, they just assumed the right answers. You can fly to London and try to hack the UCLES security of the answers though.
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dyna publisher o.o
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Win liao is it the topical one?
Mine is topical dyna publisher FYS/TYS and I can beat those who made the answer sheets hands down.
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the role of key and lock is subjective. You can see it from your own perspectives. But my textbook, yellow colour, says enzyme is the lock indeed.
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1997
1) Which is the shortest route that can be taken by the blood travelling from a leg to an arm in the human body?
A leg-heart-lungs-heart-arm
Definitely correct.
2) Which changes take place as blood flows through muscles during a long period of exercise?
blood temperature - concentration of dissolved lactic acid
D increases - increases
Both increase, since obviously when u exercise, body heat increases
lactic acid is produced coz ur muscles anaerobic respiration.
1999
3) When is the sex of the baby determined?
C at the moment of fertilisation
The sperm can either contain a X or Y chromosome. When it fuses with the egg, if it contains X, its a female. If its Y, its a male.
Thus, the book answer is correct
2000
4) What will be most likely to produce flowers of the same type and colour?
B growing all the plants from cuttings from one parent
This is coz, cuttings from same plant will be genetically identical to the parent plant. Does that answer your question?
2001
5) Where is urea produced?
D liver
urea is produced when the liver breaks down protein or amino acids, and ammonia. The kidneys then transfer the urea from the blood to the urine
2003
6) Starch is digested to maltose by the enzyme amylase.
According to the 'lock and key' hypothesis, which is the 'key' and which is the 'lock'?
'Key' ---------- 'Lock'
C starch-------------- amylase
yes, the enzyme is the lock for sure.
2006
7) Some organisms live in the dark at the bottom of the seas and to synthesise glucose, use energy from chemicals in the very hot water that comes out of the volcanoes.
What is a distinguishing feature of these organisms?
C They do not need to be green
this is because the organisms are at the bottom of the sea, hence there is no sunlight.
im not sure about B They do not need carbon dioxide, since there is actually a light and dark stage photosynthesis. Maybe the book is referring to that too?
8) Is germination in syllabus?
i don't think so. i skipped the chapt for tys
9) When concentration of adrenaline in blood increases, will it lead to an increase in insulin in blood? (since there is a increase in blood glucose concentration)
not sure / lazy to answer this :X
10) Some features of the plant leaves are listed
1 hairs on lower surface
2 large surface area
3 waxy cuticle
Which features reduce water loss from the leaves?
B 1 and 3 only
i think your answer is correct, since large surface area would increase water loss
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Originally posted by Garrick_3658:
Then I have one thing to say, YOUR SCHOOL ROCKS.
My school bought the BInsights, until I found out from my teacher that the other better book is BMatters. Weird she didn't suggest to the HOD of Science in the first place.
I mean which TYS? Which publisher?
BTW the TYS don't take answers from Cambridge, they just assumed the right answers. You can fly to London and try to hack the UCLES security of the answers though.
i agree, the publishers suck. They can publish the same WRONG answers thrice in 3 editions. Luckily i clarified with my teacher
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yes dyna sucks. i had to cancel the obviously wrong answers in the answer key, so that when my sisters use them they wont be confused
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Which of the following does not contain amino acids?
carbonic anhydrase
glycogen
insulin
haemoglobin
Issit that all hormones are made of amino acids?
When a person is frightened, does adrenaline or glycogen increase blood sugar level?
did a practise prelim. only 3 mistakes wahahaha. i always tot i suck in bio.
After sexual intervorse, sperm can survive for 3 days in oviduct. Assume ovulation can occur anytime from day 13-15. If an egg cell lives up to 2 days after ovulation, how long is the fertile phhase of the menstrual cycle.
Is it 5/6/7/8 days.
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Perhaps you would like to try not hijacking this thread, maybe the threadstarter won't be pleased. Well if you guys are RL friends then I'm sorry to interrupt.
Which of the following does not contain amino acids?
carbonic anhydrase
glycogen
insulin
haemoglobin
Issit that all hormones are made of amino acids?
Yes. Answer is glycogen.
When a person is frightened, does adrenaline or glycogen increase blood sugar level?
Both of them can't do it independently. Adrenaline requires glycogen, and glycogen requires glucagon. Weird question o.o
did a practise prelim. only 3 mistakes wahahaha. i always tot i suck in bio.
Now you know.
After sexual intervorse, sperm can survive for 3 days in oviduct. Assume ovulation can occur anytime from day 13-15. If an egg cell lives up to 2 days after ovulation, how long is the fertile phhase of the menstrual cycle.
Is it 5/6/7/8 days.
I think it's two days. Since the egg can only survive for two days, and you need the sperm and egg to fuse, you can't have fertilisation occuring without both of them.
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thanks. Yo great mind, are you sleeping late at 12 too?
Which features contribute most to conserving heat in nearly all mammals?
rapid metabolism or hair covering skin?
Which is not a component of volunteery action?
1)effector organ 2) receptor neuron 3) relay neuron
In a chromosome diagram with all the chromosomes, how do you differentiate between boy and girl. Ill check wiki on this myself too.
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Which features contribute most to conserving heat in nearly all mammals?rapid metabolism or hair covering skin?
I think it's hair covering skin, since mammals all have hair.
EDIT: And also because hair is a distinctive trait of all mammals. Birds are warm-blooded too, but they have feathers.
Which is not a component of volunteery action?
1)effector organ 2) receptor neuron 3) relay neuron
I think it's receptor neuron, since a voluntary action does not neccessarily respond to a stimulus.
EDIT: CONFIRMED
In a chromosome diagram with all the chromosomes, how do you differentiate between boy and girl. Ill check wiki on this myself too.
Check out the 23 chromosome pair. A boy has a short Y chromosome and long X chromosome. A girl has 2 long X chromosomes.
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woo thanks for the chromosome one so Y is short. and boy is xy while girl is xx.
So great minds sleep late before exams eh.
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i still have to differ for the first one tho. hair doesnt contribute MOST to conserving heat.
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will check this thread tmr morning for fun. As for now. Good night!