In the process of grafting,what is the name given to the part of the plant that is attached to the cut stem of another plant?

$(i)$ Some organisms have the capacity of reproducing by using a single parent. Such organisms have a simple body structure.
$(a)$ What is this method called?
$(b)$ Name any four types of this method.
$(c)$ Give two examples of organisms using this method for reproduction.
$(ii)$ Identify the method of reproduction used by $Spirogyra$ and $Rhizopus$.

In the context of reproduction of species,state the main difference between fission and fragmentation. Also,give one example of each.

'Regeneration is not reproduction'. Justify this statement with reason.

Give reasons as to why the following processes are different from each other:
$(a)$ Fission in $Amoeba$ and $Plasmodium$.
$(b)$ Binary fission and Fragmentation.

In $Rhizopus$,tubular thread-like structures bearing sporangia at their tips are called: