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02207032/CAPE/SPEC/KMS 2017

CAPE BIOLOGY

UNIT 2 -- PAPER 032

MARK SCHEME

Specific Objectives: 1.5, 1.6 -- Module 2

UK XS
Question 2.

(a)  Mention of light being necessary for the process of
photosynthesis, therefore in well illuminated areas,
large amounts of oxygen will be released.

 Increase in availability of light increases the rate of
light dependent and hence light independent stages.

Statement relating directly to observation – 1 mark
Testable hypothesis – 1 mark 2

(b)  To investigate the effect of light intensity on the rate
of photosynthesis.

Suitable and related to hypothesis – 1 mark 1

(c)  Suitable and logical sequence (can be enhanced with
diagram).

 Controls included, i.e. parallel experiment set up with
light source placed at one constant distance throughout
experiment.

 Attempts to control conditions

- use of NaHCO3 to ensure sufficient CO2

- use of thermometer to check for changes in
temperature. Replace water if change noted.

 Duration of investigation.

- length of time elapse before volume of gas is
measured for each light intensity.

 Number of trials stated – to ensure reproductively of
experiment.

Present tense MUST be used.