Question

Select the incorrect pair

• A. Solitary cyme – Hibiscus
• B. Dichasial cyme – Ipomea
• C. Monochasial cyme – Hamelia
• D. Polychasial cyme – Nerium

Hint:

In cyme inflorescence, always remember: terminal flower forms first and growth continues from lateral branches (determinate growth).

Answer 1

The Correct Option is B

Step 1: Understanding cyme inflorescence.
Cyme is a type of determinate inflorescence in which the main axis terminates in a flower. Further growth continues through lateral branches. It is classified into different types such as solitary cyme, dichasial cyme, monochasial cyme, and polychasial cyme depending on branching pattern.

Step 2: Understanding solitary cyme.
In solitary cyme, a single flower is produced at the terminal position of the axis. Hibiscus can show solitary flower formation in certain floral arrangements, making this pairing acceptable in basic classification.

Step 3: Understanding dichasia (dichasial cyme).
Dichasial cyme is a branching pattern where two lateral branches arise below the terminal flower. This pattern is typical in plants like Dianthus and others, but not characteristically associated with Ipomea. Ipomea generally shows different inflorescence patterns, making this pairing incorrect.

Step 4: Understanding monochasial cyme.
Monochasial cyme involves the production of a single lateral branch at each node. Hamelia is correctly associated with monochasial cyme due to its one-sided branching pattern of flowers.

Step 5: Understanding polychasial cyme.
In polychasial cyme, more than two lateral branches arise below the terminal flower. Nerium exhibits this type of cymose inflorescence with multiple branching, making this pair correct.

Step 6: Final analysis and conclusion.
After comparing all options, the incorrect pairing is Dichasial cyme – Ipomea, because Ipomea does not exhibit true dichasial cyme inflorescence pattern. Hence, option (2) is incorrect.