It makes complete sense.The water potential of X is LOWER than Y, since it is more concentrated. This makes water move into X at a greater pressure than Y, so that the sucrose solution moves from X to Y. Hope that makes sense.
Thanks
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It makes complete sense.The water potential of X is LOWER than Y, since it is more concentrated. This makes water move into X at a greater pressure than Y, so that the sucrose solution moves from X to Y. Hope that makes sense.
Haha yes I marked D. :/When a cell is placed in a solution that has low water potential, the cell's water content is lost to the surroundings. So the cell shrinks. Should be A.
Perhaps you were confused by D. A cell would actually burst when placed in high water potential solution, since water would move into the cell and make it expand, till it bursts (if it doesn't have a cell wall Eg animal cell)
Thanks for your help.20: nitrogenous bases are read as 3. Meaning 3 nitrogenous bases codes for one amino acid. Therefore 12/2 = 6, 6/3= 2. Ans is 2 x 10^3
23: Divide first time you get 100% hybrid DNA (as mentioned in the question). Divide twice you get 50% hybrid and 50% containing only 14N. Divide 3 times, you will get 25% of hybrid and 75% containing only 14N. What about 4th times? there will be about 12.5% of hybrid DNA and about 82.5% DNA containing of 14N. You can try to draw the nuclear division diagram like i attached to you earlier so you can have an image about it.
24: I think the volume does not change is because the contraction is very fast, so the volume of ventricle is somehow remain the same ... (sorry I am not sure with this )
30: 1 is caused by the tension of water, forming a negative pressure in the xylem vessel. 3 is somehow relates to the statement 1.
15: Not sure about this too...
Anybody please help out with question 15!! and question 24 as well
Hope you can understand my explanation and correct me if i have made any mistake.
Alhamdulillah I was able to download it.Dude I have been trying to download them from yesterday! And everytime after waiting for almost 30 min they say that its failing!!
I think random here means the 'obvious' movement of particles as described by the kinetic theory, molecules moving from high to low conc. to minimize the collisions etc.http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w11_qp_12.pdf
question
24
15 so They are all random.What do they mean by random here?
Please and Thank you!
I actually marked teh one in which all are NOT random :/I think random here means the 'obvious' movement of particles as described by the kinetic theory, molecules moving from high to low conc. to minimize the collisions etc.
....tricky question
Let me look at the other one.
If u have the book by Mary Jones, Richard Frosbery...there is a very good explanation of question like this on page 120 (SAQ 9.1)I actually marked teh one in which all are NOT random :/
Okay
Let me read it.If u have the book by Mary Jones, Richard Frosbery...there is a very good explanation of question like this on page 120 (SAQ 9.1)
tell me if u dont have that book or if u still can't understand
Did you try what I told you to?Give me your email, if you want them, I think this is the only way to send tem!
Oh hmm that never happened to me though.Yess I did, and this happens everytime!
They are general notes that my teacher bought online, it helps you in solving all the three papers 1,2and 3!
View attachment 57553
Thanks alot.
I saw you asked that diffusion question somewhere I forgot where but anyhow here's the answer:Thanks alot.
Just imagine I get blank space instead of these. o.o
Okay thank you.I saw you asked that diffusion question somewhere I forgot where but anyhow here's the answer:
Diffusion occurs as A RESULT OF random movements. Molecules move randomly, colliding with each other, which eventually leads to general NET movement down the concentration gradient.
Osmosis is the same as diffusion, but just with H2O molecules. It happens AS A RESULT OF random movements.
Facilitated diffusion is just the same as diffusion, it occurs passively due to concentration gradient, as a RESULT of random movements. The only difference with diffusion is that it is regulated by channel proteins and carrier proteins
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