Which of the following characteristic features is not associated with monocotyledonous plants?

Step 1: Analyze the question We need the feature that is NOT a characteristic of monocots (monocotyledonous plants).

Step 2: Recall the features of monocots

• One cotyledon (seed leaf)
• Fibrous root system
• Narrow leaves with parallel venation
• Floral parts in multiples of three (trimerous)
• Scattered vascular bundles in the stem
• No true cambium (so usually no secondary growth)
• Sepals and petals are usually not well differentiated. They look alike and are called tepals (e.g. in lilies, and often in grasses)

Step 3: Check each option

• A. Well differentiated sepals and petals: This is not typical of monocots. Their sepals and petals look alike. Well-differentiated sepals and petals are more characteristic of dicots.
• B. Fibrous root system: This is a monocot feature (e.g. maize, grass).
• C. Narrow leaves: This is a monocot feature (e.g. guinea corn, sugarcane).
• D. Floral parts in multiples of three: This is a monocot feature. Dicots have floral parts in fours or fives.

Step 4: Answer The feature not associated with monocots is A. Well differentiated sepals and petals.

Exam tip: Remember "Monocot = 1, 3, parallel, fibrous, scattered." That means one cotyledon, floral parts in threes, parallel venation, fibrous roots and scattered vascular bundles. For "NOT" questions, find the three options that match this list. The remaining one is the answer.