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Date November 2017 Marks available 2 Reference code 17N.3.HL.TZ0.17
Level Higher level Paper Paper 3 Time zone TZ0 / no time zone
Command term Describe Question number 17 Adapted from N/A

Question

Define fundamental niche.

[1]
a.i.

Outline a reason for organisms seldom occupying their entire fundamental niche.

[1]
a.ii.

Describe the relationship between Zooxanthellae and reef-building coral species.

[2]
b.

Markscheme

the potential/full range of conditions under which an organism can live

a.i.

competition for resources/named resource

OR

competitive exclusion «limits the niche»

a.ii.

a. «endo»symbiotic/mutualistic relationship

b. zooxanthellae/photosynthetic algae/dinoflagellates live in coral tissues

c. coral provides protection for algae/dinoflagellates

d. algae/dinoflagellates provide minerals/products of photosynthesis/oxygen/sugars to coral

[Max 2 Marks]

b.

Examiners report

[N/A]
a.i.
[N/A]
a.ii.
[N/A]
b.

Syllabus sections

Option C: Ecology and conservation » Option C: Ecology and conservation (Core topics) » C.1 Species and communities
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Option C: Ecology and conservation » Option C: Ecology and conservation (Core topics)
Option C: Ecology and conservation

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