Question

what criteria do we see to decide whether something is alive

Answer 1

1 ) Growth and it's movement is one of the most basic criteria to decide whether something is alive or not.
Movement can be also seen in plants if any of the plant part moves.

2) Also respiration can be used to detect life in any object i.e inhaling and exhaling.

Answer 2

 Processes essential for maintaining life are as follows:

Nutrition
Respiration
Reproduction
Excretion
Locomotion
 and movement