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Question 19N.3.HL.TZ0.17b

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.HL.TZ0.17b
Level HL Paper 3 Time zone TZ0
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 2]
19N.3.HL.TZ0.17b
(b)

Outline the roles of Rhizobium bacteria in the nitrogen cycle.

[2]

Markscheme

a. «Rhizobium» forms mutualistic/symbiotic relationship with roots/legumes ✔

b. «Rhizobium» fixes «atmospheric» nitrogen ✔

c. converts it into ammonia «to be used by plants» ✔

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