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Summary NSC GRADE 12 LIFE SCIENCES- PLANT RESPONSES TO THE ENVIRONMENT
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Includes in depth explanation of plant responses to the environment
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PLANT RESPONSE TO THE ENVIRONMENTPLANT HORMONES
A hormone is a chemical substance that is produced in small quantities in one
part of an organism and then transported to another part where it performs its
function
Auxins
Produced in root tip and growing stems
Cell division
Cell elongation
Growth
Gibberellins
Cell elongation
Growth
Germination of seeds
Production of buds and flowers
Abscisic acid
Dormancy (protects the plant during different environments)
Inhibits growth of seeds
Important in the functioning of the stomata
TROPISMS
A response by part of a plant to an external stimulus
Phototropism
Plant growth response to light
Stem grows towards light and are positively phototrophic
Roots grow away from light and are negatively phototrophic
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