Which of the following pairs of tissues is responsible for strengthening the plant?

The pair of tissues that is responsible for strengthening the plant is Collenchyma and Sclerenchyma. Collenchyma cells have thick cell walls and provide support to the plant while still allowing for growth. They are found in areas of the plant that are actively growing, such as in the stems and leaves. Sclerenchyma cells have even thicker cell walls and provide more rigid support to the plant. They are found in areas of the plant that are no longer actively growing, such as in the stems and roots. Together, Collenchyma and Sclerenchyma cells help to provide strength and support to the plant, allowing it to stand upright and withstand external forces.