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Question 18M.3.HL.TZ2.a

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.HL.TZ2.a
Level HL Paper 3 Time zone TZ2
Command term Identify Question number a Adapted from N/A
a.
[Maximum mark: 2]
18M.3.HL.TZ2.a

The interaction web shows top-down and bottom-up effects in a seagrass study system.

Identify which of the types of interaction shown in the key occur between crabs and seagrass.

[2]

Markscheme

a. indirect 

b. negative «effect» 

c. top-down

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