Question

Which one of the following statements about all the four of Spongilla, Leech, Dolphin And Penguin is correct?

• A. Penguin is homeothermic while the remaining three are poikilothermic
• B. Leech is a fresh water form while all others are marine
• C. All are bilaterally symmetrical
• D. Spongilla has special collared cells called choanocytes, not found in the remaining three.

Answer 1

The correct option is D

Spongilla has special collared cells called choanocytes, not found in the remaining three.

The correct option is D.

Explanation of the correct option:

1. A sponge's body is cylindrical, asymmetrical, or radial symmetry.
2. Sponges are aquatic creatures.
3. They can be either saltwater or freshwater.
4. Sponges have choanocytes or flagellated cells that aid in the ingestion of food particles.

Explanation of the incorrect option:

Option A:

1. The penguin is a bird, not a mammal.
2. It belongs to Chordata.

Option B:

1. Leech has bilateral symmetry.
2. Leech is a member of the phylum Annelida.

Option C:

1. Sponge bodies are cylindrical, asymmetrical, or have radial symmetry.
2. Leeches, dolphins, and penguins have bilateral symmetry.

Final answer: Spongilla has special collared cells called choanocytes, not found in the remaining three is a correct statement among given statements.