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Date May 2018 Marks available 1 Reference code 18M.2.SL.TZ2.3
Level Standard level Paper Paper 2 Time zone Time zone 2
Command term State Question number 3 Adapted from N/A

Question

The electron micrograph shows a palisade mesophyll cell.

State the name of the structures labelled I and II.

 

[1]
a.i.

Outline the function of the structure labelled III.

[2]
a.ii.

The plant from which this cell was taken is in the group angiospermophyta. State one characteristic that is unique to this group of plants.

[1]
a.iii.

Distinguish between autotrophic nutrition and heterotrophic nutrition.

[2]
b.

Explain how energy and nutrients are transferred in ecosystems.

[3]
c.

Markscheme

I. cell wall 

II. nucleus/chromatin

Both needed.

a.i.

a. necessary for photosynthesis/converts light energy into chemical energy

b. contains chlorophyll to absorb light

c. (contains enzymes) for production of carbohydrate/glucose/starch

a.ii.

a. produce flowers 

b. enclosed seeds/have fruit

a.iii.

Table format not required.
Must be paired statements.

b.

a. energy enters ecosystems from the Sun / continuous supply from the Sun 

b. light energy is converted into chemical energy and lost with movement along food chains
OR
energy needs to be «constantly» added «to ecosystem» as lost with movement along food chains / energy lost as heat with movement along food chains 

c. nutrients are recycled within ecosystems / nutrients in an ecosystem are finite and limited 

d. nutrients not lost but transformed into different compounds 

e. nutrients «carbon compounds»/energy flow through food chains by means of feeding

c.

Examiners report

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

Syllabus sections

Core » Topic 1: Cell biology » 1.2 Ultrastructure of cells
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Core » Topic 1: Cell biology
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