1.4 Transport across cell membranes

The table shows mean percentage changes in mass for cylinders from two potatoes. Both potatoes are tested using the same method.

Table

Sugar concentration / $dm−3\text{mol dm}^{-3}$	Potato P / $%\%$	Potato Q / $%\%$
0.20	+4	+8
0.30	0	+4
0.40	-4	0

What do these results suggest about the dissolved substances in the potato cells before immersion?

[1]

P has a higher concentration; its zero mass change occurs in a less concentrated solution

P has a lower concentration; its zero mass change occurs in a more concentrated solution

Q has a lower concentration; its zero mass change occurs in a more concentrated solution

Q has a higher concentration; its zero mass change occurs in a more concentrated solution

The table shows mean percentage changes in mass for cylinders from two potatoes. Both potatoes are tested using the same method.

Table

Sugar concentration / $dm−3\text{mol dm}^{-3}$	Potato P / $%\%$	Potato Q / $%\%$
0.20	+4	+8
0.30	0	+4
0.40	-4	0

What do these results suggest about the dissolved substances in the potato cells before immersion?

P has a higher concentration; its zero mass change occurs in a less concentrated solution

P has a lower concentration; its zero mass change occurs in a more concentrated solution

Q has a lower concentration; its zero mass change occurs in a more concentrated solution

Q has a higher concentration; its zero mass change occurs in a more concentrated solution

1.4 Transport across cell membranes Questions