Two slides of plant tissues parenchyma and sclerenchyma

Deepa was shown two slides of

plant tissues: parenchyma and sclerenchyma.

She can identify sclerenchyma by the

(a) location of nucleus

(b) size of cells

(c) thickness of cell walls

(d) position of vacuoles 

Answer: (c) thickness of cell walls. 

The walls of sclerenchyma tissues are thickened due to lignin (a chemical substance which acts as cement and hardens them).