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Question 20N.2.SL.TZ0.2a.i

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.2.SL.TZ0.2a.i
Level SL Paper 2 Time zone TZ0
Command term State Question number a.i Adapted from N/A
a.i.
[Maximum mark: 1]
20N.2.SL.TZ0.2a.i

The photomicrograph below shows the protozoan Paramecium caudatum.

[Source: Deuterostome, CC BY-SA 3.0
https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons.]

(a.i)

State the genus of this organism.

[1]

Markscheme

Paramecium

Examiners report

In a about half of the candidates named the genus correctly (Paramaecium), but significantly fewer could state the correct domain (eukaryota). The most common wrong answers were prokaryote and eubacteria. Only the better candidates were able to outline the method of nutrition (heterotrophy) in b and describe how homeostasis is carried out, in spite of being specifically stated in the syllabus. The endosymbiotic theory was quite well known.

Syllabus sections