Velamen tissue present in the epiphytic roots of orchids help in the absorption of ___________.

Step-by-step solution

Velamen is a specialized spongy, multiple epidermis found in the aerial roots of epiphytic plants like orchids. It consists of dead cells with thickened walls that act like a sponge, allowing the roots to rapidly absorb water vapour and moisture directly from the atmosphere. This adaptation helps epiphytes survive in environments where they do not have access to soil water. Answer: water vapour