Section 1, Part A - Multiple Choice (5 Viewers)

[Coolwashy]

Can anyone comfirm Q11? Was it C or D. If it's C then doesnt that make A.I the same thing as hybridisation? or are they the same thing? ahahahha shit

edit: i put D

 

[huyennessyy]

Only got 10 in the MC. Oh dear.

I got that too...Don't worry you're not alone

 

[eXanimo]

Can anyone comfirm Q11? Was it C or D. If it's C then doesnt that make A.I the same thing as hybridisation? or are they the same thing? ahahahha shit

edit: i put D

Because every new generation, the same biscuits are put back into the jar. In reality, the biscuits would change over time, because yellow biscuits would give birth to more yellow biscuits

 

[mytstephen]

Can anyone comfirm Q11? Was it C or D. If it's C then doesnt that make A.I the same thing as hybridisation? or are they the same thing? ahahahha shit

edit: i put D

It was C. Through A.I, they crossed two animals to get a hybrid. The resultant organism has genes from both the parents.
Grafting also makes hybrids but they aren't considered true hybrids- instead they have a mixture of cells from the two plants involved in the grafting.

I was so close to choosing D but I thought to myself 'how the hell do the genes from the two individual plants combine to make a hybrid?'

 

[liz2814]

Hey guys can anyone tell me approximately what mark im looking at? like from what everyone thinks the answers aree.. thankss
1. b
2. c
3. a
4. c
5. a
6. c
7. b
8. b
9. b
10. d
11. c
12. c
13. d
14. a
15. a
16. d
17. d
18. b
19. c
20. b

thankyouuuu

 

[Ryan_T90]

I think I only got like 11 or 12, that's shocking I definitely feel the multiple choice this year was a lot harder than previous years especially with the wording, but oh well, it's done so there isn't much I can do now.

 

[hsc2012la]

Can someone explain to me why 20 isn't D :|

It can't be D because the cream biscuits picked by the students represent organisms that have unfavourable characteristics within a population hence it's not a limitation of the investigation.

 

[juicystar07]

Could someone please confirm 7 for me? I put B, but from some peoples answers, it is D ...

Mutliple choice was definitely difficult than previous years, majorly due to the wording of questions. Board of Studies need to start getting their game up.

 

[ZombieApocalypse]

This sucks

When I did past papers, i normally get at least 16/20, but from what I can see, i've gotten 13/20 this time around

 

[wilsondw]

Im pretty sure I answered all of the multiple choice....but my mind is telling me that I forgot to answer a few....

Did any1 get that feeling b4?

 

[emmkayyez]

I got:
1. B
2. C
3. D (Don't know what I was thinking)
4. C
5. A
6. C
7. B
8. C (Again, don't know what I was thinking)
9. B (guessed)
10. A
11. D
12. C
13. D
14. A (unsure)
15. C (unsure)
16. D
17. D (unsure)
18. B
19. A (tbh, I don't remember what I put down.... Which means there could be a chance I accidently left it out)
20. B

As you can probably tell from my many wrong answers, I'm not very good at this subject LOL

 

[It doesnt matte]

How did u get ur answers i cant remember any??

 

[harro619]

Ok can someone help, for question 14 (what is the role of the kidney in freshwater fish), everyone is saying it is 'A', to remove water from the fish, but doesn't water move in and out of the fish via diffusion, i thought the answer was 'B', to absorb salt from the environment, can someone clarify why it is A.

 

[Chulbul Pandey]

Ok can someone help, for question 14 (what is the role of the kidney in freshwater fish), everyone is saying it is 'A', to remove water from the fish, but doesn't water move in and out of the fish via diffusion, i thought the answer was 'B', to absorb salt from the environment, can someone clarify why it is A.

I think the answer's A because the kidney's role is mainly osmoregulation, so controlling the water level. True, water moves in through diffusion. But by ur reasoning, salt also moves through diffusion, so I think the answer's A.
The wording of the questions was terrible this year!! And the multiple choice questions were pretty hard! Some of them, I thought all 4 options were correct :/

 

[Kimyia]

Ok can someone help, for question 14 (what is the role of the kidney in freshwater fish), everyone is saying it is 'A', to remove water from the fish, but doesn't water move in and out of the fish via diffusion, i thought the answer was 'B', to absorb salt from the environment, can someone clarify why it is A.

Ok, I think A is correct because:
Its a freshwater fish which means inside the fish is a higher solute concentration than the surrouding water. That means heaps of water is going to move into the fish to try and dilute it and equalise the concentrations so the fish excretes copius amount of dilute water. Therefore, the fish needs its kidneys to excrete water from the fish. It is not the kidneys role to absorb salt from the environment - it maintains salt levels, yes, but it could just be that the wording of 'absorb salt from the environment' makes B wrong.

 

[Safraaz]

Ok can someone help, for question 14 (what is the role of the kidney in freshwater fish), everyone is saying it is 'A', to remove water from the fish, but doesn't water move in and out of the fish via diffusion, i thought the answer was 'B', to absorb salt from the environment, can someone clarify why it is A.

I put B saying that to absorb salt from the environment. Option A sounded too vague saying that to remove water from the fish.... Obviously how much??? If you remove all the water from the fish... its going to die through dehydration??!
Option B sounded alright... saying that to absorb salt from the environment.... since the environment contains so less ions... it would want to maintain it's ion levels in the body as salt would move out of its body through diffusion. This would result in the fish secreting large amounts of dilute urine... The key word here is large.... it simply does not mean removing water... which could also be interpreted as removing all the water from the fish....
The role of the kidney is to maintain osmoregulation, however its function is to also excrete toxic nitrogenous wastes from the fish. So just saying to remove water does not sound right to me....or its just me because I put B!!

My source btw: http://www.cartage.org.lb/en/themes...lphysiology/osmoregulation/osmoregulation.htm
In the first stanza it says: The kidney absorbs the salts that are needed, and the rest of the water is excreted. So just by saying that it removes water is insufficient as the fish does need some amount of water in the body to maintain homeostatic balance. However, the kidney in the freshwater fish would remove large amounts of water. Large being the key word.

 

[DEANius]

Absorbing salt from the environment is the role of the gills. Water constantly moves INTO the fish as it is freshwater and so there is a higher concentration of water outside and via osmosis it moves inside. Kidney then reabsorbs less water and excretes most

Source: kidneys - "A primary function of the kidney is osmoregulation. In fresh water the kidney saves ions and excretes water"

http://vet.osu.edu/assets/courses/vm608/anatomy/anatomy.html

 

[Kimyia]

Absorbing salt from the environment is the role of the gills. Water constantly moves INTO the fish as it is freshwater and so there is a higher concentration of water outside and via osmosis it moves inside. Kidney then reabsorbs less water and excretes most

This is my understanding, as well.

 

[Safraaz]

yer... but just by saying 'To remove water from the fish' does not translate into excreting most of the water... It is a bold statement just meaning that the fish would remove all the water....If the BOS had put a keyword such as large or copious then A would've been right.
BOS really needs to fix up their wording...

 

[liz2814]

my teacher seemed to think that with the hybridisation question it was D? I put C though..im not sure does anyone know what the answer was?