Question

Paracytic type of stomata are distinctive feature of:

• A. Ranunculaceae
• B. Brassicaceae
• C. Rubiaceae
• D. Caryophyllaceae

Hint:

The alternative names for stomatal types are often derived from the family they characterize. Remembering these associations can be a great shortcut: \textbf{Para}cytic = \textbf{Ru}biaceous \textbf{Anomo}cytic = \textbf{Ranu}nculaceous \textbf{Aniso}cytic = \textbf{Cruci}ferous \textbf{Dia}cytic = \textbf{Caryo}phyllaceous

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
The question asks to identify the plant family characterized by paracytic stomata. Stomatal types are classified based on the number and arrangement of subsidiary cells surrounding the two guard cells.
Step 2: Detailed Explanation:
Let's define the stomatal types associated with the given families:

Paracytic (or Rubiaceous) type: The stomata are surrounded by two subsidiary cells whose long axes are parallel to the guard cells. As the alternative name "Rubiaceous" suggests, this type is a distinctive feature of the family Rubiaceae.
Anomocytic (or Ranunculaceous) type: The stoma is surrounded by cells that are indistinguishable from the other epidermal cells. This is characteristic of the family Ranunculaceae.
Anisocytic (or Cruciferous) type: The stoma is surrounded by three subsidiary cells, one of which is distinctly smaller than the other two. This is characteristic of the family Brassicaceae (Cruciferae).
Diacytic (or Caryophyllaceous) type: The stoma is enclosed by two subsidiary cells whose common wall is at a right angle to the long axis of the guard cells. This is characteristic of the family Caryophyllaceae.
Step 3: Final Answer:
Based on the classification, paracytic stomata are a distinctive feature of the family Rubiaceae.