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Summary Topic 8 Photoreceptors in plants

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Edexcel Biology Topic 8 Photoreceptors in plants

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OCR
Course
Topic 8








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Study Level
A/AS Level
Examinator
OCR
Subject
Biology A
Unit
Topic 8
All documents for this subject (7)

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Uploaded on
January 20, 2025
Number of pages
4
Written in
2023/2024
Type
Summary

Subjects

  • edexcel
  • topic 8
  • biology

Content preview

Photoreceptors in plants

Phytochrome -

flavering +
germination
short
day plants-flower when low
light
S.I units
Long day plants -



flower when
high light

Day neutral-flower irrespective of day length
Photoperiodism
↳ The recognised by
have
day lenghmorphoprological
is the plants and

effect
Phytochrone red and
phytochrome for red


Pr-650 wavelengt
PEr-730 wavelength
(beyond visual spectrum)
Prabsorbs red
light during the
day
↳
changes it to Pfr
-> In he dark .
Pfr absorbs for red and converts
it to red

↳ slow dark reversion



PFr is he critical active version

time
night important

Short plants low PFr concentration
day need

↳ - hours 17 night
day
PFr
Long day plants need
high concentration

↳ 17 hous night and 7
daylight
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