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Biology Question 110 – NEET-UG 2023

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Axile placentation is observed in

Placentation is the arrangement of ovules within the ovary, and different types include marginal, axile, parietal, free central, and basal.

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Ninja Strategy•Direct Recall of Placentation Examples

Quickly recall the specific placentation type for each plant mentioned in the options to identify the group where all members have axile placentation.

Step 1: Define Axile Placentation✦ Active

Axile placentation is a type of placentation where the placenta forms an axis in the center of a multilocular (chambered) ovary, and the ovules are attached to this central axis. Examples include China rose, Tomato, Lemon, and Petunia.

Step 2: Evaluate Each Option for Placentation Type○ Expand

Let's examine the placentation type for each plant in the given options: (1) Mustard (Parietal), Cucumber (Parietal), Primrose (Free central) - Incorrect. (2) China rose (Axile), Beans (Marginal), Lupin (Marginal) - Incorrect. (3) Tomato (Axile), Dianthus (Free central), Pea (Marginal) - Incorrect. (4) China rose (Axile), Petunia (Axile), Lemon (Axile) - Correct.

💡 Teacher's Secret Hint

Remember that a single incorrect plant in an option makes the entire option wrong.

Step 3: Identify the Correct Option○ Expand

Based on the evaluation, option (4) is the only one where all listed plants (China rose, Petunia, and Lemon) exhibit axile placentation.

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