This page contains the detailed and easy notes forGCSE Biology OCR Coordination and Control – The nervous System for revision and understanding Coordination and Control – The nervous System.
GCSE OCR GATEWAY Biology Complete Revision Summary
PLANT HORMONES
Plant hormones
- Plant hormones
Auxin and gravitopism
Practical activity – Effects of light or gravity on seedling growth
Other plant hormones – Higher
Use of plant hormones – Higher
Auxin is produced in the shoot tip. When light falls on auxin it is displaced to the shader side promoting growth of the shader region resulting in growth of shoot towards light.
Gravitropism – The movement of roots towards gravity.
- It is also caused by auxin. In roots auxin inhibits the growth of the roots at the lower side resulting in bending of the root downwards.
- Auxin is displaced to lower side in response to gravity.
Plant hormones
GCSE OCR GATEWAY BIOLOGY Plant hormones COMPLETE REVISION
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GCSE OCR GATEWAY BIOLOGY Plant hormones COMPLETE REVISION
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PLANT HORMONES
AUXINS
- It stimulates cell divsion and growth of the plant
- It is used to stimulate rooting in tissue culture.
- Used as Weedicide causing excess growth of the weed and killing them.
GIBBERLINS
- Seed germination
- Promote flowering
- End seed dormancy
- Elongation of stem.
ETHENE
- It is a gaseous hormone
- It is involved in fruit ripening
- Allows transportation of raw fruit to long distances and then they can be ripped by ethene.
Cytokinin
Caused Cell Division
Abscicic acid
Stress hormone prepared the plant for stress conditions
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References:
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Human Nervous System
- Human Nervous System 1 MS
- Human Nervous System 1 QP
- Human Nervous System 2 MS
- Human Nervous System 2 QP
- Human Nervous System 3 MS
- Human Nervous System 3 QP
