Which tissue is responsible for primary growth ?

The lawn grass (Cyandon dactylon) needs to be mowed frequently to prevent its overgrowth. Which tissue is responsible for its rapid growth?

The meristem which occurs between mature tissues and responsible for primary growth called :

Which tissue is responsible for producing root from runner of grass?

Which structure is responsible for excretion in Amoeba?

Describe vascular cambium responsible for secondary growth in detail.