Question

1. Ripening of fruit : Natural change :: making paper from wood:
2. Controlling cell activities : Nucleus :: Liquid part of cell:
* Thermos flask: Sir James Dewar
4. Separation based on solubility of substance : Chromatography method :: Separation of two
immiscible liquids​

Answer 1

Answer:

1. Ripening of fruit : Natural chage :: Making paper from wood : Artificial change

2. Controlling cell activities : Nucleus :: Liquid part of cell : Cytoplasm

4. Seperation based on solubility of substance : Chromatography :: Seperation of two immiscible liquid : Seperating funnel

* Third one I am not clear with the question so I am unable to answer it. Sorry .