A permanent plant tissue made up of living cells having thickening at the corners is
Collenchyma
The correct option is B.
Explanation of the correct option:
Explanation of the incorrect option:
Option A:
Sclerenchyma is the permanent tissues that are thin-walled and dead cells.
Option C:
Parenchyma cells are permanent tissues that are thin-walled and loosely packed cells.
Option D:
Phloem is a complex permanent tissue that has thin walls and is associated with the transportation of food across the plant.
Final answer:
A permanent plant tissue made up of living cells having thickening at the corners is Collenchyma.