Question

Unicellular conical, warty trichomes, paracytic stomata, xylem vessels with annular thickening are important microscopical features of which plant?

• A. Datura metal
• B. Cassia angustifolia
• C. Digitalis purpurea
• D. Atropa belladonna

Answer 1

The Correct Option is B

The provided question requires us to identify a plant based on its microscopical features. Let's analyze these features:

1. Unicellular Conical, Warty Trichomes: These are unicellular hair-like structures with a conical and warty appearance. They are characteristic of certain plant species.
2. Paracytic Stomata: This type of stomata has a subsidiary cell parallel to the guard cells. The arrangement provides a specific pattern seen under microscopic examination.
3. Xylem Vessels with Annular Thickening: These are vascular tissues with a type of thickening in the xylem vessels forming ring-like structures.

Now, let's consider each of the given options:

• Datura metel: It generally has distinctive trichomes, but they do not match the exact description provided. The stomatal and xylem characteristics are also different.
• Digitalis purpurea: Known for its cardiac glycosides, it has different microscopical features, especially in leaf anatomy, and does not fit the feature list given.
• Atropa belladonna: While Atropa has unique trichomes, its stomata and xylem features are not entirely matching the description.
• Cassia angustifolia: This plant, commonly known as "Senna," is noted for having unicellular conical, warty trichomes, paracytic stomata, and xylem vessels with annular thickening. These match the description provided in the question.

Therefore, based on the microscopical features described in the question, the correct answer is Cassia angustifolia.