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Biology Question 114 – NEET-UG 2024

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Which of the following is an example of actinomorphic flower?

Flowers can be classified based on their symmetry into actinomorphic (radial symmetry) or zygomorphic (bilateral symmetry).

Step 1: Understand Flower Symmetry✦ Active

Flower symmetry is a key morphological characteristic. Actinomorphic flowers exhibit radial symmetry, meaning they can be divided into two identical halves by any vertical plane passing through the center. Zygomorphic flowers, on the other hand, possess bilateral symmetry, meaning they can be divided into two identical halves in only one particular vertical plane.

Step 2: Identify Symmetry for Given Options○ Expand

Let's analyze the symmetry of the flowers for each given option: 1. Cassia: Belongs to the Fabaceae family (subfamily Caesalpinioideae). Flowers are typically zygomorphic (bilateral symmetry), though some can be slightly irregular. 2. Pisum (Pea): Belongs to the Fabaceae family (subfamily Papilionoideae). Flowers are distinctly zygomorphic, characterized by a papilionaceous corolla. 3. Sesbania: Also belongs to the Fabaceae family (subfamily Papilionoideae). Its flowers are distinctly zygomorphic, similar to Pisum. 4. Datura: Belongs to the Solanaceae family. Flowers in this family, including Datura, are typically actinomorphic (radial symmetry).

💡 Teacher's Secret Hint

Remember that most members of the Fabaceae family (especially Papilionoideae) have zygomorphic flowers, while Solanaceae often have actinomorphic flowers.

Step 3: Select the Correct Example○ Expand

Based on the analysis, Datura is an example of a plant with actinomorphic flowers.

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