Actin exists as: 

a globular monomer -G-actin 

a filamentous polymer- F-actin

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Root Apical meristem

root  apical  meristem is a  thimble-like  root  cap,  which  protects  the  delicate  apical  meristem  as  the root  pushes  through  the  abrasive  soil

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Root apical meristem

root  cap  secretes  a  polysaccharide  slime  that  lubricates  the  soil  around  the  tip  of  the  root

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Root apical meristem

Growth  occurs  just  behind  the  tip  in  three  overlapping  zones  of  cells at  successive  stages of  primary  growth.  These  are  the  zones  of  cell  division,  elongation, and differentiation

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Intercalary meristem

meristem which occurs between mature tissues is known as intercalary meristem

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Intercalary meristem

They occur in grasses and regenerate parts removed by the grazing herbivores

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Lateral meristem

Present on lateral side and increases thickness, girth and diameter