Vegetative propagation in mint occurs by

In which of the following plants is the root bud involved in vegetative propagation?

Vegetative propagation in $Pistia$ occurs by:

Which of the following propagates through leaf-tip?

Which process is observed in $Amoeba$ during unfavorable conditions?

Is it possible to consider vegetative propagation observed in certain plants like $Bryophyllum$,water hyacinth,ginger,etc.,as a type of asexual reproduction? Give two/three reasons.