Environmental systems and societies, first assessment 2026, Subject brief (IBO 2023), read 29 Oct 2026
Which definition of a species is used in ESS?
Question 21 mark
No notes
IB ESS SL and HL
Spec and skills
Paper scope: Paper 1; Paper 2
Topic spec Paper 1
Topic spec Paper 2
Skill: ess-t2a-populations
Knowledge check
Environmental systems and societies, first assessment 2026, Subject brief (IBO 2023), read 29 Oct 2026
What is the difference between a species' habitat and its niche?
Question 31 mark
No notes
IB ESS HL
Spec and skills
Paper scope: Paper 1; Paper 2
Topic spec Paper 1
Topic spec Paper 2
Skill: ess-t2a-niche
Knowledge check
Environmental systems and societies, first assessment 2026, Subject brief (IBO 2023), read 29 Oct 2026
A barnacle species can survive across the whole rocky shore when kept alone, but on a real shore it lives only in the upper zone because a competitor crowds it out lower down. What is the upper zone?
Question 41 mark
No notes
IB ESS HL
Spec and skills
Paper scope: Paper 1; Paper 2
Topic spec Paper 1
Topic spec Paper 2
Skill: ess-t2a-niche
Knowledge check
Environmental systems and societies, first assessment 2026, Subject brief (IBO 2023), read 29 Oct 2026
Why is a species' realized niche usually smaller than its fundamental niche?
Question 51 mark
No notes
IB ESS HL
Spec and skills
Paper scope: Paper 1; Paper 2
Topic spec Paper 1
Topic spec Paper 2
Skill: ess-t2a-niche
Knowledge check
Environmental systems and societies, first assessment 2026, Subject brief (IBO 2023), read 29 Oct 2026
Two species of protist with identical niches are grown together in one culture. One dies out. What does this show?