Explanation:
A
A type of cells called 'velamen' occur in orchid roots. Velamen is a specialized tissue found in the aerial roots of some orchids or vanda. Velamen is a spongy, multiple epidermis that covers the roots of some epiphytic or semi-epiphytic plants, such as orchid species. Velamen is provide support, prevent water less, and assist the plant in absorbing water directly from atmosphere. The epiphytic roots are devoid of root hairs and root caps.