DP Biology (last assessment 2024)
Question 17N.3.HL.TZ0.17
| Date | November 2017 | Marks available | [Maximum mark: 4] | Reference code | 17N.3.HL.TZ0.17 |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Define, Describe, Outline | Question number | 17 | Adapted from | N/A |
17.
[Maximum mark: 4]
17N.3.HL.TZ0.17
(a.i)
Define fundamental niche.
[1]
Markscheme
the potential/full range of conditions under which an organism can live
(a.ii)
Outline a reason for organisms seldom occupying their entire fundamental niche.
[1]
Markscheme
competition for resources/named resource
OR
competitive exclusion «limits the niche»
(b)
Describe the relationship between Zooxanthellae and reef-building coral species.
[2]
Markscheme
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]