Two slides of plant tissues parenchyma and sclerenchyma

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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).

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