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Date May 2018 Marks available 2 Reference code 18M.2.SL.TZ1.4
Level Standard level Paper Paper 2 Time zone Time zone 1
Command term Identify Question number 4 Adapted from N/A

Question

State one reason that viruses are not classified as living organisms.

[1]
a.i.

State the plant phylum which is characterised by the absence of vascular tissue.

[1]
a.ii.

C. nemoralis (pictured below) is a mollusc. Identify two external features that distinguish this snail from an arthropod.

[2]
b.

Outline the role of plant pigments in the process of photosynthesis.

[3]
c.

Markscheme

a. they do not have a metabolism/homeostasis/other specifically named life function 

b. cannot reproduce by themselves 

c. they are not cells/they need a host cell

a.i.

bryophyta

a.ii.

a. unsegmented body (whereas arthropods are segmented) 

b. shell (versus exoskeleton in arthropods) 

c. muscular foot (which arthropods do not have) 

d. no (jointed) appendages/(jointed) legs (whereas arthropods have jointed legs/appendages) 

e. slimy/mucus-covered / arthropod is not slimy

Do not award marks for any answers after the first two given.

b.

a. pigments/chlorophyll absorb light 

b. red and blue/violet light absorbed 

c. absorption of light energy is necessary for photolysis/use of water in photosynthesis 

d. other pigments allow for wider action spectrum than the absorption spectrum of chlorophyll

c.

Examiners report

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

Syllabus sections

Core » Topic 5: Evolution and biodiversity » 5.3 Classification of biodiversity
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Core » Topic 5: Evolution and biodiversity
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