WAEC - Biology (1995 - No. 8)
Which of the following pairs of tissues is responsible for strengthening the plant?
Phloem and Epidermis
Parenchyma and Cambium
Collenchyma and Sclerenchyma
Collenchyma and Cambium
Xylem and Cambium
Explication
Collenchyma cells have thin primary walls with some areas of secondary thickening. Collenchyma provides extra mechanical and structural support, particularly in regions of new growth. Sclerenchyma cells have thick lignified secondary walls and often die when mature. Sclerenchyma provides the main structural support to a plant.