Question

Velamen, the spongy tissue found in

• A. Breathing roots of halophytes
• B. Parasitic plants
• C. All aerial roots
• D. Areial roots of epiphytic orchids

Answer 1

Answer: (D)

Areial roots of epiphytic orchids

The epiphytes have several layered hygroscopic epidermis, called velamen tissues. It is made from spongy dead cells which helps in absorption of water from atmosphere. It also checks excessive loss of water from cortex. Usually the wall of velamen has spiral or reticulate secondary thickening of cellulose, pectin and lignin. Orchids are epiphytic, so they have velamen.

So, the correct answer is 'Areial roots of epiphytic orchids'.