CAIE A-Level Biology A2 13.1.8 Cyclic Photophosphorylation Questions
Explain cyclic photophosphorylation using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- A2
Exam points
- Explain cyclic photophosphorylation.
CAIE A-Level Biology A2 13.1.8 Cyclic Photophosphorylation Questions question 1
[Maximum number: 4]
Corals grow in shallow sea water. Corals consist of colonies of small animals called polyps. These polyps have photosynthetic protoctists called algae within their cells, which is advantageous both to the coral polyps and to the algae.
The algae that live within the cells of coral polyps can also live independently as free-living algae.
Photosynthesis in the algae living within the cells of coral polyps is the same as photosynthesis in plant cells.
Outline the process of cyclic photophosphorylation.
any four from:
1 only involves photosystem I ;
2 light energy absorbed (by accessory pigments) ;
3 passed on to, chlorophyll a / primary pigment / reaction centre ;
4 electron, excited to higher energy level / emitted from chlorophyll ;
5 collected by electron acceptor ;
6 passed along electron transport chain ;
7 ATP produced by chemiosmosis ;
8 electron returns to chlorophyll ;
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