What is Dedifferentiation?

Give an account on Dedifferentiation.

Compare Redifferentiation with Dedifferentiation.

Define growth, differentiation, development, dedifferentiation, redifferentiation, determinate growth, meristem and growth rate.

{:((a),"Totipotency ", -, "Gottlieb" ),(,,,"Haberlandt"),((b), "Differentiation " ,-,"Structural changes"),(,,, "of cell "),((c),"Redifferentiation" , -, "Explant "),((d), "Dedifferentiation ", -, "Formation of callus" ):}

Match the following : {:(,"Column I",,"Column II"),(1.,"Totipotency",(A),"Reversion of mature cells into meristem"),(2.,"Dedifferentiation",(B),"Biochemical and structural changes of cell"),(3.,"Explant",(C),"Properties of living cells develops into entire plant"),(4.,"Differentiation",(D),"Selected plant tissue transferred to culture medium."):}

What are chordae tendinae and what is their function?