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July 23, 2019, 07:17:41 pm

Author Topic: VCE Biology Upgrade My Answer  (Read 1059 times)  Share 

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Bri MT

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VCE Biology Upgrade My Answer
« on: February 22, 2019, 03:32:03 pm »
+9
VCE BIOLOGY
UPGRADE MY ANSWER


What is this thread for?
If you want feedback on your answers so you can get more marks for your knowledge, this is the place!

Step 1. Share a question you didn't get full marks on, including your answer and how many marks the question was worth
Step 2. Wait for another user (maybe even multiple!) to provide feedback on how they might've approached the question and how you could improve your answer
Step 3. Apply the feedback you've learnt to aim for higher marks more confidently :)


Who can/will provide feedback?
Everyone is welcome to contribute; even if you're unsure of yourself, providing different perspectives is incredibly valuable.

Please don't be dissuaded if you haven't finished Year 12, or didn't score as highly as others, or your advice contradicts something else you've seen on this thread, or whatever; none of this disqualifies you from helping others. And if you're worried you do have some sort of misconception, put it out there and someone else can clarify and modify your understanding! 

There'll be a whole bunch of other high-scoring students with their own wealths of wisdom to share with you, including TuteSmart tutors! So you may even get multiple answers from different people offering their insights - very cool.


To ask a question or make a post, you will first need an ATAR Notes account. You probably already have one, but if you don't, it takes about four seconds to sign up - and completely free!


OTHER BIOLOGY RESOURCES
« Last Edit: February 22, 2019, 03:57:40 pm by miniturtle »
VCE: Sciences, eng lang & methods
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SmartWorker

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Re: VCE Biology Upgrade My Answer
« Reply #1 on: March 29, 2019, 05:05:16 pm »
0
Hi, can we submit pracs for review?

PhoenixxFire

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Re: VCE Biology Upgrade My Answer
« Reply #2 on: March 29, 2019, 05:49:43 pm »
0
Hi, can we submit pracs for review?
Hey,
It depends what the prac is for - if it's work that you're going to be submitting for a SAC (e.g. U4 AOS3) then we can't help you with it as that's against VCAA rules. If it's not something that you're going to be submitting then we can give you feedback on it :)
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almondsforlife

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Re: VCE Biology Upgrade My Answer
« Reply #3 on: April 09, 2019, 06:04:19 pm »
+1
Hi! This is my first post and I had my first sac in term 1. This is one question I didn’t get full marks on - could someone please give some feedback?
Question: Two species of plants are found, and both live in highly saline soils. Sodium is transported via facilitated diffusion in root cells. Suggest why this is vital for the survival of these Antarctic plants. (3 marks)
My answer: The root cells need sodium ions to survive in the harsh saline environment, and so there is a net passive movement of sodium ions from an area of high concentration of sodium ions in the highly saline soils to an area of low concentration of sodium ions in the root cells across a semipermeable membrane via channel proteins until equilibrium is reached.
Thanks again.

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Re: VCE Biology Upgrade My Answer
« Reply #4 on: April 09, 2019, 06:18:52 pm »
+4
Hi! This is my first post and I had my first sac in term 1. This is one question I didn’t get full marks on - could someone please give some feedback?
Question: Two species of plants are found, and both live in highly saline soils. Sodium is transported via facilitated diffusion in root cells. Suggest why this is vital for the survival of these Antarctic plants. (3 marks)
My answer: The root cells need sodium ions to survive in the harsh saline environment, and so there is a net passive movement of sodium ions from an area of high concentration of sodium ions in the highly saline soils to an area of low concentration of sodium ions in the root cells across a semipermeable membrane via channel proteins until equilibrium is reached.
Thanks again.
You have basically answered WHAT is happening in this situation. The questions wants to know WHY it is important.

almondsforlife

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Re: VCE Biology Upgrade My Answer
« Reply #5 on: April 09, 2019, 07:36:37 pm »
+1
You have basically answered WHAT is happening in this situation. The questions wants to know WHY it is important.
Oh okay. So would the root cells become too turgid if there was a steep concentration gradient of sodium ions?

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Re: VCE Biology Upgrade My Answer
« Reply #6 on: April 09, 2019, 08:16:08 pm »
+1
Oh okay. So would the root cells become too turgid if there was a steep concentration gradient of sodium ions?
If the soil was highly saline and had a high concentration of sodium relative to the roots, then water would move from the root cells into the soil (water moves towards the solute).
Given this, maybe it will be a bit more obvious why it is important for the root cells to transport sodium into the cell, remembering that plants do need water to survive.
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almondsforlife

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Re: VCE Biology Upgrade My Answer
« Reply #7 on: April 09, 2019, 08:30:33 pm »
+1
If the soil was highly saline and had a high concentration of sodium relative to the roots, then water would move from the root cells into the soil (water moves towards the solute).
Given this, maybe it will be a bit more obvious why it is important for the root cells to transport sodium into the cell, remembering that plants do need water to survive.
Ohhh! So the root cells would become plasmolysed or flaccid due to the movement of free water molecules from the cells to the soil. Thank you!

enociz

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Re: VCE Biology Upgrade My Answer
« Reply #8 on: April 09, 2019, 10:28:52 pm »
+3
Ohhh! So the root cells would become plasmolysed or flaccid due to the movement of free water molecules from the cells to the soil. Thank you!

I think your answer should look at:
- The problem (there is a lot of sodium in the soil as opposed to the root cells, leading to a strong concentration gradient by which water is able to have a net movement out of the cells and into the lower water potential in the highly saline soil)
- The solution given (when the passive diffusion of salt into the root cells occurs, it balances the concentration gradient by equalising the salt concentration inside the cell with that in the soil)
- The impact this has (this prevents the net movement of water out of the cell by removing the concentration gradient needed for the osmosis of water molecules to occur, allowing the plant to retain the water needed to survive)

That might be too much detail for each part, but it should cover the 3 marks. :)

almondsforlife

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Re: VCE Biology Upgrade My Answer
« Reply #9 on: April 10, 2019, 06:26:26 pm »
+1
I think your answer should look at:
- The problem (there is a lot of sodium in the soil as opposed to the root cells, leading to a strong concentration gradient by which water is able to have a net movement out of the cells and into the lower water potential in the highly saline soil)
- The solution given (when the passive diffusion of salt into the root cells occurs, it balances the concentration gradient by equalising the salt concentration inside the cell with that in the soil)
- The impact this has (this prevents the net movement of water out of the cell by removing the concentration gradient needed for the osmosis of water molecules to occur, allowing the plant to retain the water needed to survive)

That might be too much detail for each part, but it should cover the 3 marks. :)
Thank you so much for the sample response! I wasn’t thinking about osmosis, only diffusion, so I only mentioned movement of sodium ions.