2012 VCAA Biology Unit 3 Suggested Answers

[Gazillionaire]

for question 8d, would controlling pests be considered a condition that the biologist have to maintain to keep chlorella conditions at optimum level?

[Sassy12399]

For the difference between the animal and plant cell, could we have written that plants cells have larger vacuoles than animal cells?

[Panicmode]

For the difference between the animal and plant cell, could we have written that plants cells have larger vacuoles than animal cells?

Yeah, that would be valid.

[curry_bro]

For question 7b, i said that the first line of defence would b the two of:
-intact skin forms a physical barrier around person and prevents entry of yellow fever viral particles
-mucus lining in airways specifically (e.g. bronchus) catch any viral particles and immobilise them, preventing them from infecting cells... is that right? i dont noe about the second one, cause the disease is carried by a mosquito vector, so i didnt think that mucus lining in air ways was a good answer (mainly cause mosquitoes tend not to fly into our lungs...)

[gina.c]

With question 4. c) i, I said that it might have been that because it had been so long since the adults had had the immunisation, they may not have had sufficient B memory cells to combat the infection. And then for ii, I said that another vaccination could be made compulsory at the age of 30 and 50... Is that still right?

[Highacheiver]

hey guys, this is going to sound really dumb, but could it be right if i said one difference between the endocrine and nervous system was the release of the chemical component? i did nervous into the synaptic cleft and endocrine into the blood... :s

[Russ]

@gina, I would mark that correct, not sure if VCAA will since they often hold a very specific view of how you should understand something

@highachiever, that's a correct statement, it'll only be marked wrong if the question had asked for something different (can't remember that question)

[InsaneMcFries]

I wrote something similar for the pertussis. The question says 66% of the adults were infected, so I realised later that VCAA probably wanted a mutation as the answer. HOWEVER, it is still possible that that is the reason they were infected.

For the endocrine and nervous system, I gave the difference of intensity of message needed, Endocrine: Low and Nervous: High. Would that be ok?

[LOLs99]

With question 4. c) i, I said that it might have been that because it had been so long since the adults had had the immunisation, they may not have had sufficient B memory cells to combat the infection. And then for ii, I said that another vaccination could be made compulsory at the age of 30 and 50... Is that still right?

Hey I did write exactly the same as yours but I didn't include the age30-50.

 
Did u put 2 answers for the difference between animal cell and plant cell?
I just put 1and will they deduct my mark given that it is 2marks

[Highacheiver]

With question 4. c) i, I said that it might have been that because it had been so long since the adults had had the immunisation, they may not have had sufficient B memory cells to combat the infection. And then for ii, I said that another vaccination could be made compulsory at the age of 30 and 50... Is that still right?

Hey I did write exactly the same as yours but I didn't include the age30-50.

 
Did u put 2 answers for the difference between animal cell and plant cell?
I just put 1and will they deduct my mark given that it is 2marks

yeh i only put one difference as well! i just said the cell wall and explained it sort of because i thought that not all plant cells neccessarily have chloroplasts and a vacuole

[Panicmode]

With question 4. c) i, I said that it might have been that because it had been so long since the adults had had the immunisation, they may not have had sufficient B memory cells to combat the infection. And then for ii, I said that another vaccination could be made compulsory at the age of 30 and 50... Is that still right?

Hey I did write exactly the same as yours but I didn't include the age30-50.

 
Did u put 2 answers for the difference between animal cell and plant cell?
I just put 1and will they deduct my mark given that it is 2marks

yeh i only put one difference as well! i just said the cell wall and explained it sort of because i thought that not all plant cells neccessarily have chloroplasts and a vacuole

The way I read the question is 1 mark for organelle, 1 mark for explanation.

[LOLs99]

With question 4. c) i, I said that it might have been that because it had been so long since the adults had had the immunisation, they may not have had sufficient B memory cells to combat the infection. And then for ii, I said that another vaccination could be made compulsory at the age of 30 and 50... Is that still right?

Hey I did write exactly the same as yours but I didn't include the age30-50.

 
Did u put 2 answers for the difference between animal cell and plant cell?
I just put 1and will they deduct my mark given that it is 2marks

yeh i only put one difference as well! i just said the cell wall and explained it sort of because i thought that not all plant cells neccessarily have chloroplasts and a vacuole

The way I read the question is 1 mark for organelle, 1 mark for explanation.

Hopefully!! As being said, 1m for organelle and 1m for a comparative statement. And just wondering if they will deduct your mark for question 2 if I label like 6/7 when they asked u to label 3? Histamine granules and receptor site for igE acceptable?

[InsaneMcFries]

It will be fine as it specified AT LEAST 3. However, if you mislabelled something you may lose the mark.

[rebeccab26]

for the question about first line of defence, can you talk about skin acting as the first physical barrier against infection as well as mucous membranes?

[rebeccab26]

and for the last q: could you say the environment [they must be in a pond or whatever] and the location of the pond [must be near the plant to allow co2 intake]?