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Biology Standard Level : Photosynthesis

Decent Essays
IB Internal Assessment

BIOLOGY STANDARD LEVEL
PHOTOSYNTHESIS PRACTICAL REPORT

Candidate Name: Meara Berhan Ahmed
Candidate number: 000790 – 0003

(Word count: 4500)

Examination session: November 2015
Design

Research Question
What is the effect of altering the distance (±0.05 cm) of the Elodea Canadensis aquatic plant from a light source at (5cm, 15cm, 25cm, 35cm and 45cm) on the photosynthetic rate by counting the number of oxygen bubbles rising up the test tube per minute (min^(-1))?

Aim:
To investigate the how the photosynthetic rate of Elodea Canadensis is affected by varying its distance (cm) (±0.05) from the light source at (5cm, 15cm, 25cm, 35cm and 45cm) by counting the number of oxygen bubbles rising up the test tube per minute (min^(-1)).

Background Information:
Photosynthesis is the process by which plants use energy from sunlight to produce chemical energy in the form of glucose, which cellular respiration then converts into ATP (Farabee, 2010). The chemical equation for photosynthesis is:

6〖CO〗_2+ H_2 O→C_6 H_12 O_6+ 〖6O〗_2

There are two stages to photosynthesis. The first stage of photosynthesis is a set of reactions typically referred to as the light-independent reactions (Damon, 2007). The light-independent reactions predominantly involve photosynthetic pigments (including chlorophyll) absorbing light energy and undergoing a conversion into chemical energy known as Adenosine Triphosphate (ATP). Also, light energy is utilised by the plant to undergo
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