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Zoology Question 46 – AP-EAMCET 2025

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The following are the names of some non-chordate animals. I. Euspongia II. Aurelia III. Beroe IV. Taenia V. Wuchereria VI. Convoluta Identify the flat worms among them

Recall the major phyla of non-chordate animals and their characteristic features, especially focusing on body plans like flatworms, roundworms, and segmented worms.

Step 1: Analyze the Question and Identify Key Terms✦ Active

The question asks to identify "flatworms" from a given list of non-chordate animals. Flatworms are characterized by their dorsoventrally flattened body and belong to the Phylum Platyhelminthes.

💡 Teacher's Secret Hint

It's crucial to distinguish between flatworms (Platyhelminthes), roundworms (Nematoda), and segmented worms (Annelida) as they are often confused.

Step 2: Classify Each Animal by Phylum○ Expand

Let's classify each animal in the provided list into its respective phylum:

I. Euspongia: Belongs to Phylum Porifera (Sponges).

II. Aurelia: Belongs to Phylum Cnidaria (Jellyfish).

III. Beroe: Belongs to Phylum Ctenophora (Comb jellies).

IV. Taenia: Belongs to Phylum Platyhelminthes (Tapeworm).

V. Wuchereria: Belongs to Phylum Nematoda (Filarial worm, a roundworm).

VI. Convoluta: Belongs to Phylum Platyhelminthes (Acoel flatworm).

💡 Teacher's Secret Hint

Knowing common examples for each major invertebrate phylum is essential for such classification questions.

Step 3: Identify the Flatworms from the Classified List○ Expand

Based on the classification in Step 2, the animals belonging to Phylum Platyhelminthes (flatworms) are:

IV. Taenia

VI. Convoluta

💡 Teacher's Secret Hint

Double-check your classification to ensure accuracy, especially for less common examples like Convoluta.

Step 4: Match with the Given Options○ Expand

The identified flatworms are IV and VI. Comparing this with the given options:

1. I, III

2. II, IV

3. IV, VI

4. V, VI

The correct option is 3.

💡 Teacher's Secret Hint

Always review all options before making a final selection to avoid errors.

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