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Question 18N.2.HL.TZ0.5b

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.2.HL.TZ0.5b
Level HL Paper 2 Time zone TZ0
Command term Distinguish Question number b Adapted from N/A
b.
[Maximum mark: 2]
18N.2.HL.TZ0.5b
(b)

Distinguish between osmoregulators and osmoconformers.

[2]

Markscheme

a. concentration constant inside osmoregulators versus variable inside osmoconformers ✔

b. internal solute concentration can differ from the external environment in osmoregulators versus same/equal in osmoconformers
OR
osmoregulators are independent of the external environment in solute concentration versus osmoconformers are tied to it ✔

c. birds/mammals/humans/freshwater fish are osmoregulators versus starfish/mussels/crabs/jellyfish/sea squirts/squid/sharks are osmoconformers ✔

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