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Summary Responding to the environment - Plants Grade 12

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Course
Life Science Grade 12

Institution
The Hill College

summary of the Gr12 plants responding to the environment that explains auxins and its functions as well as the trophisms and much more

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Uploaded on September 20, 2018
Number of pages 4
Written in 2018/2019
Type Summary

life science
grade 12
biology
plants
taylan perrin
responding to the environment plants

taylanperrin Member since 6 year 73 documents sold

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Responding to the Environment-
Plants
Auxins
 Most important group of plant hormones
 Indoleacetc acid (IAA)  most common naturally occurring auxin
 Constantly made by cells in the tp of a shoot (apical bud) small amounts also produced in root tp
 Defuse downwards towards root
 Concentraton highest at the tp and lowest at the root

Functions of Auxins
1.. Auxins promote growth

 Promote both mitosis and cell elongaton
 Further stem tssues are from shoot tp more sensitie they become to auxin concentraton
 If concentraton of auxins are to high cell elongaton will be stopped
 Root elongaton requires less auxins than stems – higher concentratons will inhibit cell elongaton in
roots

2.. Auxins cause apical dominance

 High concentraton of auxins near the apical bud inhibits the growth of the higher lateral buds
 Lower down the plant the auxin concentraton becomes less so lower lateral buds can produce shoots
which grow into lateral branches
 This giies plants a pyramidal shape
 If apical bud is remoied, lateral buds will grow as they are no longer inhibited by auxins and a bushier
plant will deielop

3.. Auxins play a part in trophic moiements

 Brought about by auxins causing cell elongaton on only one side of the stem and root
 Results in uneien growth

Tropisms
 Growth moiements of part of a plant in response to an eniironmental stmulus
 Moiement is dependent on the directon of the stmulus and it results from diferental growth

Phototropism
 Growth response to a light stmulus

Why do shoots respond to light ?
 Auxins = light sensitie hormones
 Moie away from the light source
 Light comes from one directon, auxins from the growing tp moies away from the light source
 Increased concentraton makes these cells elongate more than those on the bright side, so the shoot
bends towards the light
 Shoots/Stems are therefore positiely phototropic
 Roots are negatiely phototropic

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