OCR F214 Photosynthesis

HideShow resource information
  • Created by: Bethany.
  • Created on: 30-04-16 21:06
Preview of OCR F214 Photosynthesis

First 299 words of the document:

F214 Module 3: Photosynthesis
4.3.1 Photosynthesis
(a) define the terms autotroph and heterotroph
Autotrophs organisms that use light energy or chemical energy and inorganic molecules (carbon dioxide and
water) to synthesise complex organic molecules.
Heterotrophs organisms that ingest or digest complex organic molecules, releasing the chemical potential
energy stored in them.
Phototrophs organisms that uses energy from sunlight to synthesise organic compounds for nutrition.
Chemoautotrophs ­ organisms which synthesise complex organic molecules using light energy derived from
exergonic chemical reactions.
(b) state that light energy is used during photosynthesis to produce complex organic molecules
Photosynthesis is the process whereby light energy from the Sun is transformed into chemical energy and used to
synthesis large/complex organic molecules from inorganic substances.
(c) explain how respiration in plants and animals depends upon the products of photosynthesis
Both photoautotrophs and heterotrophs can release the chemical potential energy in complex organic molecules
(made during photosynthesis) this is respiration. They can also use the oxygen for aerobic respiration .
The equation below summarises the process of photosynthesis: 6CO2 + 6H2
O (+ light energy) C6
+ 6O2
Once the Earth's atmosphere contained free oxygen , organisms evolved that could use the oxygen for aerobic
respiration . This releases carbon dioxide back into the atmosphere and produces water.
6 12 6 + 6O 2 6CO 2 + 6H
2O (+ energy, some as ATP)
(d) state that in plants photosynthesis is a twostage process taking place in chloroplasts
In plants photosynthesis is a twostage process (lightdependent and lightindependent ) taking place in
(e) explain, with the aid of diagrams and electron micrographs, how the structure of chloroplasts enables them
to carry out their functions

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

F214 Module 3: Photosynthesis
(f) define the term photosynthetic pigment
Photosynthetic pigments molecules that absorb light energy. Each pigment absorbs a range of wavelengths in
the visible region and has its own distinct peak of absorption. Other wavelengths are reflected. They appear to us
as the colour of the light wavelengths that they are reflecting.
(g) explain the importance of photosynthetic pigments in the photosynthesis
There are many different pigments that act together, to capture as
much light energy as possible.…read more

Page 3

Preview of page 3

Page 4

Preview of page 4

Page 5

Preview of page 5

Here's a taster:

F214 Module 3: Photosynthesis
Most triose phosphate is recycled to ribulosebisphosphate. 5 out of 6 molecules of TP (3C) are recycled by
phosphorylation , using ATP from the lightdependent reaction , to 3 molecules of RuBP (5C).…read more

Page 6

Preview of page 6

Page 7

Preview of page 7

Here's a taster:

F214 Module 3: Photosynthesis
Using Changes in Density of Leaf Discs:
1. Use a drinking straw to cut several leaf discs .
2. Place 5/6 discs in a 10cm3 syringe and halffill the syringe with dilute sodium hydrogencarbonate solution.
3. Hold the syringe upright , place your finger over the end of the syringe and gently pull on the plunger pulls the
air out of the spaces of spongy mesophyll in the leaf disks.…read more


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »