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Question 19N.2.HL.TZ0.8b

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Date November 2019 Marks available [Maximum mark: 4] Reference code 19N.2.HL.TZ0.8b
Level HL Paper 2 Time zone TZ0
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 4]
19N.2.HL.TZ0.8b
(b)

Outline the growth of plant shoot apex.

[4]

Markscheme

a. growth in shoots is indeterminate/unlimited ✔

b. produces stem and leaves ✔ For mpb, both stem and leaves are needed and buds or branches should not be accepted as alternatives.

c. growth/cell growth/cell elongation controlled/affected by hormones/auxin/IAA ✔

d. new/extra cells produced by mitosis/cell division / apex is a meristem ✔

e. tropism/phototropism / grows towards the sun/light ✔

f. auxin moved away from sunny side/to shady side of shoot «apex»
OR
auxin efflux pumps set up concentration gradients ✔

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