Why is parenchyma called a permanent tissue? Name the two special types of parenchyma. Mention their specific roles in plants.

(N/A) Parenchyma is called a permanent tissue because its cells have differentiated and lost the ability to divide,taking up a specific role in the plant body.
The two special types of parenchyma are:
$1$. Chlorenchyma
$2$. Aerenchyma
Their specific roles are:
- Chlorenchyma contains chlorophyll and performs photosynthesis.
- Aerenchyma contains large air cavities and provides buoyancy to aquatic plants,helping them to float.