VCE Biology Exam Discussion and Solutions

[LPadlan]

if that's the question I think it is then I'm pretty sure that's what I picked too.

I got c) 1/3 of point s or something. I assumed point s was around 0.18 and i divided by 3 resukting in 0.06. If you look at the graph it kinda makes sense. Hopefully Thushan can provide some clarifications

[PhoenixxFire]

I almost picked C, but then I decided D looked better. Hopefully someone has a copy of the exam

[JaeSunRyoo]

If you’re asking about which part of the immune system it was from, I said innate immune system because it also talked about cytokines and lysozymes

You can say 2nd line of defence, right? That's what I said, and I'm pretty sure it falls under innate immunity...

I'm starting to feel anxious XD

[JaeSunRyoo]

Can you say amount of food coackroche consumes before testing each day and the same type of food consumed for two controlled variables?

I have a feeling I messed up that question now, lol.

I talked about humidity in the chamber given the distance of the heat lamp to the chamber and the amount of moisture in the air contributing to having an effect on relative cellular respiration on the cockroach, but I feel like I'm blabbing again. Not really sure, will be waiting to see solutions.

[PhoenixxFire]

You can say 2nd line of defence, right? That's what I said, and I'm pretty sure it falls under innate immunity...

I'm starting to feel anxious XD

I just said innate immunity *gulp*. Fairly sure I messed up the question about why the gas levels in the rats container was measured for 4 min instead of one. It felt like I repeated the stem of the question.
The controlled variables I picked were way worse than the ones you used.

[True Dat]

I have a feeling I messed up that question now, lol.

I talked about humidity in the chamber given the distance of the heat lamp to the chamber and the amount of moisture in the air contributing to having an effect on relative cellular respiration on the cockroach, but I feel like I'm blabbing again. Not really sure, will be waiting to see solutions.

I'm guessing my answers of an Air tight container and Constant temperature are wrong then?

[PhoenixxFire]

I had trouble determining the purpose of that group a caterpillar question haha

It was a control - You can't know if they're going to eat 'less' if you don't know what normal is. I think I answered it badly though.

[JaeSunRyoo]

I'm guessing my answers of an Air tight container and Constant temperature are wrong then?

Air tight I think was already given since it said it was a "closed" chamber. That, and we don't want the cockroach to die, right? That being said, I don't think it would be in the chamber long enough to die from lack of 02, but... eh, I don't know, really. We'll have to see.

Constant temperature was one of the variables being tested. In the first part of the question, he tested the chamber without the cockroach for 4 mins, labeling the C02, 02 levels and the relative temperature. Even tho 02 levels decreased, I don't think constant temperature would've been a constant variable. I put that as a independent variable.

[True Dat]

It was a control - You can't know if they're going to eat 'less' if you don't know what normal is. I think I answered it badly though.

I answered it with : To provide an example of what would happen over the 4 days without the presence of a caterpillar

[Stolfin]

The two controls i said was..
1. the amount of ice around the chamber had to be consistant due to cooling temps differed
2. the food the cockroach ate had to be the same over the 6 days
i was effy about it tho :/

[Ahmad_A_1999]

WELL... Did VCAA run out of questions or something, there was half the course missing and they replaced it with a 9 marker on Mega fauna extinctions    struggled with time too 

[PhoenixxFire]

The two controls i said was..
1. the amount of ice around the chamber had to be consistant due to cooling temps differed
2. the food the cockroach ate had to be the same over the 6 days
i was effy about it tho :/

I said the first one too I didn't even think about food - the other one I said was that the cockroach had to be kept in an environment of the same temperature whenever its not in the container - fairly sure it was wrong 

[JaeSunRyoo]

The two controls i said was..
1. the amount of ice around the chamber had to be consistant due to cooling temps differed
2. the food the cockroach ate had to be the same over the 6 days
i was effy about it tho :/

Though the food thing is probably a good point that I should have fricking put in, not too sure about ice. I think it was assumed from the graphs that a consistent amount of ice would be placed in order to lower the temperature to 10 degrees Celsius...  unless they're using a different form of ice?

[PhoenixxFire]

WELL... Did VCAA run out of questions or something, there was half the course missing and they replaced it with a 9 marker on Mega fauna extinctions    struggled with time too 

I'm so mad about that - It didn't even really test our knowledge, it was more can you understand what you're reading. There's so many things they didn't cover too. I was expecting lots of experimental design but it was 2 long questions...

[PhoenixxFire]

Though the food thing is probably a good point that I should have fricking put in, not too sure about ice. I think it was assumed from the graphs that a consistent amount of ice would be placed in order to lower the temperature to 10 degrees Celsius...  unless they're using a different form of ice?

I wrote the same amount of ice because it didn't mention it taking the same amount of time to cool to 10 degrees.