In-Plant tissues, the cell walls of _____ are coagulated by 'suberin 'which makes them impervious to gas and water molecules.

The correct answer is Option 2, i.e., Cork. 

• In-Plant tissues, the cell walls of 'cork' are coagulated by 'suberin' which makes them impervious to water & gas molecules. 
• Protective tissues: 
  • These tissues provide fortification to the plant. 
  • They include two basic things which are known as the 'epidermis & cork'.
• The following table shows the components of protective tissues with respective features. 

  Components of Protective tissues	Features
  Epidermis	It is a layer of cell that makes up the outer casing in the plant. At certain places, the stomata perforate the epidermis. The stomata help in loss of gaseous exchange & water
  Cork	It is the external protective tissue that substitutes the epidermal cells in mature roots & stems. Cork cells lack intercellular gaps & lifeless. The cell walls of corks are coagulated by suberin which makes them impervious to water molecules & gas molecules.