Question

Which of the following causes almost unbearable irritation of the skin?

• A. Lint of Gossypium
• B. Staminal hair of Tradescantia
• C. Prickles of Rosa indica
• D. Stinging hair of Urtica dioca

Answer 1

The correct option is D Stinging hair of Urtica dioca

The trichomes of Utrica cover the leaf and the stem surfaces, each trichome has a base attached to the epithelial layer, and a cell filled with irritant/allergent at the tip, that breaks on mechanical damage, touch, or when attempted to be eaten by herbivores. On breaking the chemical substances are injected into the predator causing unbearable irritation.

So, the correct answer is 'Stinging hair of Urtica dioca'