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Summary A Level Biology OCR A 17.3 Photosynthesis
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Notes on Photosynthesis (17.3). Helped me achieve an A* in biology.
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🍃17.3 Photosynthesis
Class Bio
Created @Apr 8, 2021 9:08 PM
Date of Exam @Apr 27, 2021
Exam Questions done?
Reviewed
Teacher Mrs Batchelor
Type Sub-topic
Photosynthesis is the process by which energy, in the form of
light from the sun, is used to build complex organic
molecules, such as glucose. Light energy is transformed into
chemical energy trapped in the bonds of the complex organic
molecules produced. Organisms that can photosynthesise, like
plants and algae, are said to be autotrophic.
Heterotrophic organisms, like animals, obtain complex organic
molecules by eating each other (heterotrophic and/or
autotrophic organisms).
17.3 Photosynthesis 1
, Both autotrophic and heterotrophic organisms then break down
complex organic molecules during the process of respiration to
release the energy they need to drive metabolic processes.
structure and function of
chloroplasts
Photosynthesis takes place in chloroplasts. The network of
membranes present within chloroplasts provides a large surface
area to maximise the absorption of light essential in the
first step of photosynthesis.
The membranes form flattened sacs called thylakoids which are
stacked to form grana. The grana are joined by membranous
channels called lamellae.
Light is absorbed by complexes of pigments, such as
chlorophyll, which are embedded within the thylakoid
membranes.
17.3 Photosynthesis 2
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