Survivor39's Answer and Some Explantion to Multiple Choice Questions (1 Viewer)

[liquid.ghoul]

there is no way question 12 is D!

This has been said many times, and I suggest you read the replies, and try to understand it, without blind ignorance.

Cannot be A. This is because salt ions are not moved in osmosis, it is the water which is moved.

Cannot be B. That statement is correct, but does not work with a selectively permeable membrane. Diffusion occurs when there are two concentrations of solute, with nothing in between. The selectively permeable membrane stops this from occuring.

Cannot be C. The confusion with this, is a misunderstanding of the word solute. If this occured, then the water molecules would be moving from the right of the membrane to the left (if you look at the diagram). The right side, has a lot of salt ions, therefore it has high solute concentration, and the other side low. This statement says that the water is moving from high solute to low solute. They also say diffusion, and not osmosis.

Can be D. Think of killing a leech. When you put salt on it, you are raising the solute level on the outside of the leech. The water then passes from the inside of the leech, to the outside, to balance the solute levels. This kills the leech through dehydration.



Question 15 is not B, because although they evolved from a common ancestor (very far back), that is not the reason they have similar structures. They are similar, because of convergent evolution. Similar environmental pressures causing similar traits.