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Question 20N.3.HL.TZ0.17

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Date November 2020 Marks available [Maximum mark: 3] Reference code 20N.3.HL.TZ0.17
Level HL Paper 3 Time zone TZ0
Command term Construct Question number 17 Adapted from N/A
17.
[Maximum mark: 3]
20N.3.HL.TZ0.17
(d)

A type of ecosystem in Brazil is tropical rainforest. Construct a Gersmehl diagram on the outline provided, to show flows of nutrients between stores in tropical rainforests.

[3]

Markscheme

Gersmehl diagram showing the following:

a. thick arrow from soil to biomass:

b. thick arrow from litter to soil;

c. thin arrow from biomass to litter;

Examiners report

Most candidates did poorly on this question; some had difficulty drawing arrows in correct directions, and most could not indicate differences in flows using arrow thickness; blank answers were seen.

Syllabus sections